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# "Apache Hadoop" Changelog

## Release 2.8.0 - 2017-03-17

### INCOMPATIBLE CHANGES:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [YARN-3241](https://issues.apache.org/jira/browse/YARN-3241) | FairScheduler handles "invalid" queue names inconsistently |  Major | fairscheduler | zhihai xu | zhihai xu |
| [HADOOP-11731](https://issues.apache.org/jira/browse/HADOOP-11731) | Rework the changelog and releasenotes |  Major | documentation | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-11746](https://issues.apache.org/jira/browse/HADOOP-11746) | rewrite test-patch.sh |  Major | build, test | Allen Wittenauer | Allen Wittenauer |
| [HDFS-8226](https://issues.apache.org/jira/browse/HDFS-8226) | Non-HA rollback compatibility broken |  Blocker | . | J.Andreina | J.Andreina |
| [HADOOP-11772](https://issues.apache.org/jira/browse/HADOOP-11772) | RPC Invoker relies on static ClientCache which has synchronized(this) blocks |  Major | ipc, performance | Gopal V | Haohui Mai |
| [YARN-2336](https://issues.apache.org/jira/browse/YARN-2336) | Fair scheduler REST api returns a missing '[' bracket JSON for deep queue tree |  Major | fairscheduler | Kenji Kikushima | Akira Ajisaka |
| [YARN-41](https://issues.apache.org/jira/browse/YARN-41) | The RM should handle the graceful shutdown of the NM. |  Major | nodemanager, resourcemanager | Ravi Teja Ch N V | Devaraj K |
| [HDFS-6564](https://issues.apache.org/jira/browse/HDFS-6564) | Use slf4j instead of common-logging in hdfs-client |  Major | build | Haohui Mai | Rakesh R |
| [MAPREDUCE-6427](https://issues.apache.org/jira/browse/MAPREDUCE-6427) | Fix typo in JobHistoryEventHandler |  Minor | . | Brahma Reddy Battula | Ray Chiang |
| [HADOOP-12269](https://issues.apache.org/jira/browse/HADOOP-12269) | Update aws-sdk dependency to 1.10.6; move to aws-sdk-s3 |  Major | fs/s3 | Thomas Demoor | Thomas Demoor |
| [HDFS-8900](https://issues.apache.org/jira/browse/HDFS-8900) | Compact XAttrs to optimize memory footprint. |  Major | namenode | Yi Liu | Yi Liu |
| [YARN-4087](https://issues.apache.org/jira/browse/YARN-4087) | Followup fixes after YARN-2019 regarding RM behavior when state-store error occurs |  Major | . | Jian He | Jian He |
| [HADOOP-12416](https://issues.apache.org/jira/browse/HADOOP-12416) | Trash messages should be handled by Logger instead of being delivered on System.out |  Major | trash | Ashutosh Chauhan | Mingliang Liu |
| [HDFS-9063](https://issues.apache.org/jira/browse/HDFS-9063) | Correctly handle snapshot path for getContentSummary |  Major | namenode | Jing Zhao | Jing Zhao |
| [HDFS-9433](https://issues.apache.org/jira/browse/HDFS-9433) | DFS getEZForPath API on a non-existent file should throw FileNotFoundException |  Major | encryption | Rakesh R | Rakesh R |
| [HADOOP-11252](https://issues.apache.org/jira/browse/HADOOP-11252) | RPC client does not time out by default |  Critical | ipc | Wilfred Spiegelenburg | Masatake Iwasaki |
| [HDFS-9047](https://issues.apache.org/jira/browse/HDFS-9047) | Retire libwebhdfs |  Major | webhdfs | Allen Wittenauer | Haohui Mai |
| [HADOOP-12651](https://issues.apache.org/jira/browse/HADOOP-12651) | Replace dev-support with wrappers to Yetus |  Major | scripts | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-12552](https://issues.apache.org/jira/browse/HADOOP-12552) | Fix undeclared/unused dependency to httpclient |  Minor | build | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-11792](https://issues.apache.org/jira/browse/HADOOP-11792) | Remove all of the CHANGES.txt files |  Major | build | Allen Wittenauer | Andrew Wang |
| [YARN-5035](https://issues.apache.org/jira/browse/YARN-5035) | FairScheduler: Adjust maxAssign dynamically when assignMultiple is turned on |  Major | fairscheduler | Karthik Kambatla | Karthik Kambatla |
| [HADOOP-12892](https://issues.apache.org/jira/browse/HADOOP-12892) | fix/rewrite create-release |  Blocker | build | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-13139](https://issues.apache.org/jira/browse/HADOOP-13139) | Branch-2: S3a to use thread pool that blocks clients |  Major | fs/s3 | Pieter Reuse | Pieter Reuse |
| [HADOOP-13382](https://issues.apache.org/jira/browse/HADOOP-13382) | remove unneeded commons-httpclient dependencies from POM files in Hadoop and sub-projects |  Major | build | Matt Foley | Matt Foley |
| [HDFS-7933](https://issues.apache.org/jira/browse/HDFS-7933) | fsck should also report decommissioning replicas. |  Major | namenode | Jitendra Nath Pandey | Xiaoyu Yao |
| [HADOOP-13560](https://issues.apache.org/jira/browse/HADOOP-13560) | S3ABlockOutputStream to support huge (many GB) file writes |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-11048](https://issues.apache.org/jira/browse/HDFS-11048) | Audit Log should escape control characters |  Major | . | Eric Badger | Eric Badger |
| [HADOOP-13812](https://issues.apache.org/jira/browse/HADOOP-13812) | Upgrade Tomcat to 6.0.48 |  Blocker | kms | John Zhuge | John Zhuge |
| [HADOOP-13929](https://issues.apache.org/jira/browse/HADOOP-13929) | ADLS connector should not check in contract-test-options.xml |  Major | fs/adl, test | John Zhuge | John Zhuge |


### IMPORTANT ISSUES:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [YARN-4785](https://issues.apache.org/jira/browse/YARN-4785) | inconsistent value type of the "type" field for LeafQueueInfo in response of RM REST API - cluster/scheduler |  Major | webapp | Jayesh | Varun Vasudev |


### NEW FEATURES:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-8934](https://issues.apache.org/jira/browse/HADOOP-8934) | Shell command ls should include sort options |  Minor | fs | Jonathan Allen | Jonathan Allen |
| [HADOOP-9477](https://issues.apache.org/jira/browse/HADOOP-9477) | Add posixGroups support for LDAP groups mapping service |  Major | . | Kai Zheng | Dapeng Sun |
| [HDFS-8009](https://issues.apache.org/jira/browse/HDFS-8009) | Signal congestion on the DataNode |  Major | datanode | Haohui Mai | Haohui Mai |
| [YARN-2901](https://issues.apache.org/jira/browse/YARN-2901) | Add errors and warning metrics page to RM, NM web UI |  Major | nodemanager, resourcemanager | Varun Vasudev | Varun Vasudev |
| [HDFS-7891](https://issues.apache.org/jira/browse/HDFS-7891) | A block placement policy with best rack failure tolerance |  Minor | namenode | Walter Su | Walter Su |
| [HADOOP-11843](https://issues.apache.org/jira/browse/HADOOP-11843) | Make setting up the build environment easier |  Major | build | Niels Basjes | Niels Basjes |
| [MAPREDUCE-6284](https://issues.apache.org/jira/browse/MAPREDUCE-6284) | Add Task Attempt State API to MapReduce Application Master REST API |  Minor | . | Ryu Kobayashi | Ryu Kobayashi |
| [HADOOP-10971](https://issues.apache.org/jira/browse/HADOOP-10971) | Add -C flag to make `hadoop fs -ls` print filenames only |  Major | fs | Ryan Williams | Kengo Seki |
| [MAPREDUCE-6364](https://issues.apache.org/jira/browse/MAPREDUCE-6364) | Add a "Kill" link to Task Attempts page |  Minor | applicationmaster | Ryu Kobayashi | Ryu Kobayashi |
| [MAPREDUCE-6304](https://issues.apache.org/jira/browse/MAPREDUCE-6304) | Specifying node labels when submitting MR jobs |  Major | . | Jian Fang | Naganarasimha G R |
| [HDFS-8487](https://issues.apache.org/jira/browse/HDFS-8487) | Generalize BlockInfo in preparation of merging HDFS-7285 into trunk and branch-2 |  Major | namenode | Zhe Zhang | Zhe Zhang |
| [HDFS-8608](https://issues.apache.org/jira/browse/HDFS-8608) | Merge HDFS-7912 to trunk and branch-2 (track BlockInfo instead of Block in UnderReplicatedBlocks and PendingReplicationBlocks) |  Major | . | Zhe Zhang | Zhe Zhang |
| [HADOOP-5732](https://issues.apache.org/jira/browse/HADOOP-5732) | Add SFTP FileSystem |  Minor | fs | Íñigo Goiri | ramtin |
| [HDFS-8622](https://issues.apache.org/jira/browse/HDFS-8622) | Implement GETCONTENTSUMMARY operation for WebImageViewer |  Major | . | Jagadesh Kiran N | Jagadesh Kiran N |
| [HDFS-8155](https://issues.apache.org/jira/browse/HDFS-8155) | Support OAuth2 in WebHDFS |  Major | webhdfs | Jakob Homan | Jakob Homan |
| [MAPREDUCE-6415](https://issues.apache.org/jira/browse/MAPREDUCE-6415) | Create a tool to combine aggregated logs into HAR files |  Major | . | Robert Kanter | Robert Kanter |
| [HADOOP-12360](https://issues.apache.org/jira/browse/HADOOP-12360) | Create StatsD metrics2 sink |  Minor | metrics | Dave Marion | Dave Marion |
| [YARN-261](https://issues.apache.org/jira/browse/YARN-261) | Ability to fail AM attempts |  Major | api | Jason Lowe | Rohith Sharma K S |
| [HDFS-9184](https://issues.apache.org/jira/browse/HDFS-9184) | Logging HDFS operation's caller context into audit logs |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-9057](https://issues.apache.org/jira/browse/HDFS-9057) | allow/disallow snapshots via webhdfs |  Major | webhdfs | Allen Wittenauer | Brahma Reddy Battula |
| [YARN-4349](https://issues.apache.org/jira/browse/YARN-4349) | Support CallerContext in YARN |  Major | . | Wangda Tan | Wangda Tan |
| [YARN-3623](https://issues.apache.org/jira/browse/YARN-3623) | We should have a config to indicate the Timeline Service version |  Major | timelineserver | Zhijie Shen | Xuan Gong |
| [HADOOP-12657](https://issues.apache.org/jira/browse/HADOOP-12657) | Add a option to skip newline on empty files with getMerge -nl |  Minor | . | Jan Filipiak | Kanaka Kumar Avvaru |
| [YARN-3458](https://issues.apache.org/jira/browse/YARN-3458) | CPU resource monitoring in Windows |  Minor | nodemanager | Inigo Goiri | Inigo Goiri |
| [HADOOP-12691](https://issues.apache.org/jira/browse/HADOOP-12691) | Add CSRF Filter for REST APIs to Hadoop Common |  Major | security | Larry McCay | Larry McCay |
| [HADOOP-12635](https://issues.apache.org/jira/browse/HADOOP-12635) | Adding Append API support for WASB |  Major | fs/azure | Dushyanth | Dushyanth |
| [HADOOP-12426](https://issues.apache.org/jira/browse/HADOOP-12426) | Add Entry point for Kerberos health check |  Minor | security | Steve Loughran | Steve Loughran |
| [HDFS-9244](https://issues.apache.org/jira/browse/HDFS-9244) | Support nested encryption zones |  Major | encryption | Xiaoyu Yao | Zhe Zhang |
| [HADOOP-12548](https://issues.apache.org/jira/browse/HADOOP-12548) | Read s3a creds from a Credential Provider |  Major | fs/s3 | Allen Wittenauer | Larry McCay |
| [HDFS-9711](https://issues.apache.org/jira/browse/HDFS-9711) | Integrate CSRF prevention filter in WebHDFS. |  Major | datanode, namenode, webhdfs | Chris Nauroth | Chris Nauroth |
| [HDFS-9835](https://issues.apache.org/jira/browse/HDFS-9835) | OIV: add ReverseXML processor which reconstructs an fsimage from an XML file |  Major | tools | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9239](https://issues.apache.org/jira/browse/HDFS-9239) | DataNode Lifeline Protocol: an alternative protocol for reporting DataNode liveness |  Major | datanode, namenode | Chris Nauroth | Chris Nauroth |
| [HADOOP-12909](https://issues.apache.org/jira/browse/HADOOP-12909) | Change ipc.Client to support asynchronous calls |  Major | ipc | Tsz Wo Nicholas Sze | Xiaobing Zhou |
| [HDFS-9945](https://issues.apache.org/jira/browse/HDFS-9945) | Datanode command for evicting writers |  Major | datanode | Kihwal Lee | Kihwal Lee |
| [HADOOP-13008](https://issues.apache.org/jira/browse/HADOOP-13008) | Add XFS Filter for UIs to Hadoop Common |  Major | security | Larry McCay | Larry McCay |
| [HADOOP-13065](https://issues.apache.org/jira/browse/HADOOP-13065) | Add a new interface for retrieving FS and FC Statistics |  Major | fs | Ram Venkatesh | Mingliang Liu |
| [HADOOP-12723](https://issues.apache.org/jira/browse/HADOOP-12723) | S3A: Add ability to plug in any AWSCredentialsProvider |  Major | fs/s3 | Steven K. Wong | Steven K. Wong |
| [HADOOP-13226](https://issues.apache.org/jira/browse/HADOOP-13226) | Support async call retry and failover |  Major | io, ipc | Xiaobing Zhou | Tsz Wo Nicholas Sze |
| [HADOOP-12537](https://issues.apache.org/jira/browse/HADOOP-12537) | S3A to support Amazon STS temporary credentials |  Minor | fs/s3 | Sean Mackrory | Sean Mackrory |
| [HDFS-9804](https://issues.apache.org/jira/browse/HDFS-9804) | Allow long-running Balancer to login with keytab |  Major | balancer & mover, security | Xiao Chen | Xiao Chen |
| [HDFS-10918](https://issues.apache.org/jira/browse/HDFS-10918) | Add a tool to get FileEncryptionInfo from CLI |  Major | encryption | Xiao Chen | Xiao Chen |
| [HADOOP-13716](https://issues.apache.org/jira/browse/HADOOP-13716) | Add LambdaTestUtils class for tests; fix eventual consistency problem in contract test setup |  Major | test | Steve Loughran | Steve Loughran |
| [HADOOP-14049](https://issues.apache.org/jira/browse/HADOOP-14049) | Honour AclBit flag associated to file/folder permission for Azure datalake account |  Major | fs/adl | Vishwajeet Dusane | Vishwajeet Dusane |
| [HADOOP-14048](https://issues.apache.org/jira/browse/HADOOP-14048) | REDO operation of WASB#AtomicRename should create placeholder blob for destination folder |  Critical | fs/azure | NITIN VERMA | NITIN VERMA |


### IMPROVEMENTS:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HDFS-2580](https://issues.apache.org/jira/browse/HDFS-2580) | NameNode#main(...) can make use of GenericOptionsParser. |  Minor | namenode | Harsh J | Harsh J |
| [MAPREDUCE-5232](https://issues.apache.org/jira/browse/MAPREDUCE-5232) | log classpath and other key properties on child JVM start |  Major | mrv1, mrv2 | Sangjin Lee | Sangjin Lee |
| [HADOOP-7713](https://issues.apache.org/jira/browse/HADOOP-7713) | dfs -count -q should label output column |  Trivial | . | Nigel Daley | Jonathan Allen |
| [HDFS-7546](https://issues.apache.org/jira/browse/HDFS-7546) | Document, and set an accepting default for dfs.namenode.kerberos.principal.pattern |  Minor | security | Harsh J | Harsh J |
| [HADOOP-11692](https://issues.apache.org/jira/browse/HADOOP-11692) | Improve authentication failure WARN message to avoid user confusion |  Major | ipc | Yongjun Zhang | Yongjun Zhang |
| [HADOOP-11226](https://issues.apache.org/jira/browse/HADOOP-11226) | Add a configuration to set ipc.Client's traffic class with IPTOS\_LOWDELAY\|IPTOS\_RELIABILITY |  Major | ipc | Gopal V | Gopal V |
| [HADOOP-11711](https://issues.apache.org/jira/browse/HADOOP-11711) | Provide a default value for AES/CTR/NoPadding CryptoCodec classes |  Minor | . | Andrew Wang | Andrew Wang |
| [MAPREDUCE-4414](https://issues.apache.org/jira/browse/MAPREDUCE-4414) | Add main methods to JobConf and YarnConfiguration, for debug purposes |  Major | client | Harsh J | Plamen Jeliazkov |
| [MAPREDUCE-6105](https://issues.apache.org/jira/browse/MAPREDUCE-6105) | Inconsistent configuration in property mapreduce.reduce.shuffle.merge.percent |  Trivial | . | Dongwook Kwon | Ray Chiang |
| [HDFS-2360](https://issues.apache.org/jira/browse/HDFS-2360) | Ugly stacktrace when quota exceeds |  Minor | hdfs-client | Rajit Saha | Harsh J |
| [MAPREDUCE-6100](https://issues.apache.org/jira/browse/MAPREDUCE-6100) | replace "mapreduce.job.credentials.binary" with MRJobConfig.MAPREDUCE\_JOB\_CREDENTIALS\_BINARY for better readability. |  Trivial | mrv2 | zhihai xu | zhihai xu |
| [MAPREDUCE-5755](https://issues.apache.org/jira/browse/MAPREDUCE-5755) | MapTask.MapOutputBuffer#compare/swap should have @Override annotation |  Trivial | . | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| [MAPREDUCE-4653](https://issues.apache.org/jira/browse/MAPREDUCE-4653) | TestRandomAlgorithm has an unused "import" statement |  Trivial | contrib/gridmix | Amir Sanjar | Amir Sanjar |
| [HADOOP-11659](https://issues.apache.org/jira/browse/HADOOP-11659) | o.a.h.fs.FileSystem.Cache#remove should use a single hash map lookup |  Minor | fs | Gera Shegalov | Brahma Reddy Battula |
| [HADOOP-11709](https://issues.apache.org/jira/browse/HADOOP-11709) | Time.NANOSECONDS\_PER\_MILLISECOND - use class-level final constant instead of method variable |  Trivial | . | Ajith S | Ajith S |
| [HDFS-7835](https://issues.apache.org/jira/browse/HDFS-7835) | make initial sleeptime in locateFollowingBlock configurable for DFSClient. |  Major | hdfs-client | zhihai xu | zhihai xu |
| [HDFS-7829](https://issues.apache.org/jira/browse/HDFS-7829) | Code clean up for LocatedBlock |  Minor | . | Jing Zhao | Takanobu Asanuma |
| [MAPREDUCE-6282](https://issues.apache.org/jira/browse/MAPREDUCE-6282) | Reuse historyFileAbsolute.getFileSystem in CompletedJob#loadFullHistoryData for code optimization. |  Trivial | jobhistoryserver | zhihai xu | zhihai xu |
| [HADOOP-11447](https://issues.apache.org/jira/browse/HADOOP-11447) | Add a more meaningful toString method to SampleStat and MutableStat |  Minor | metrics | Karthik Kambatla | Karthik Kambatla |
| [YARN-3350](https://issues.apache.org/jira/browse/YARN-3350) | YARN RackResolver spams logs with messages at info level |  Major | . | Wilfred Spiegelenburg | Wilfred Spiegelenburg |
| [MAPREDUCE-6239](https://issues.apache.org/jira/browse/MAPREDUCE-6239) | Consolidate TestJobConf classes in hadoop-mapreduce-client-jobclient and hadoop-mapreduce-client-core |  Minor | client | Varun Saxena | Varun Saxena |
| [MAPREDUCE-5190](https://issues.apache.org/jira/browse/MAPREDUCE-5190) | Unnecessary condition test in RandomSampler |  Minor | mrv2 | Jingguo Yao | Jingguo Yao |
| [MAPREDUCE-6287](https://issues.apache.org/jira/browse/MAPREDUCE-6287) | Deprecated methods in org.apache.hadoop.examples.Sort |  Minor | examples | Chao Zhang | Chao Zhang |
| [HADOOP-11737](https://issues.apache.org/jira/browse/HADOOP-11737) | mockito's version in hadoop-nfs’ pom.xml shouldn't be specified |  Minor | nfs | Kengo Seki | Kengo Seki |
| [YARN-2868](https://issues.apache.org/jira/browse/YARN-2868) | FairScheduler: Metric for latency to allocate first container for an application |  Major | . | Ray Chiang | Ray Chiang |
| [HDFS-7875](https://issues.apache.org/jira/browse/HDFS-7875) | Improve log message when wrong value configured for dfs.datanode.failed.volumes.tolerated |  Trivial | datanode | nijel | nijel |
| [HDFS-7793](https://issues.apache.org/jira/browse/HDFS-7793) | Refactor DFSOutputStream separating DataStreamer out |  Major | hdfs-client | Kai Zheng | Li Bo |
| [HADOOP-11741](https://issues.apache.org/jira/browse/HADOOP-11741) | Add LOG.isDebugEnabled() guard for some LOG.debug() |  Major | . | Walter Su | Walter Su |
| [MAPREDUCE-579](https://issues.apache.org/jira/browse/MAPREDUCE-579) | Streaming "slowmatch" documentation |  Trivial | contrib/streaming | Bo Adler | Harsh J |
| [HDFS-7928](https://issues.apache.org/jira/browse/HDFS-7928) | Scanning blocks from disk during rolling upgrade startup takes a lot of time if disks are busy |  Major | datanode | Rushabh S Shah | Rushabh S Shah |
| [HADOOP-11719](https://issues.apache.org/jira/browse/HADOOP-11719) | [Fsshell] Remove bin/hadoop reference from GenericOptionsParser default help text |  Minor | scripts | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-8004](https://issues.apache.org/jira/browse/HDFS-8004) | Use KeyProviderCryptoExtension#warmUpEncryptedKeys when creating an encryption zone |  Trivial | encryption | Andrew Wang | Andrew Wang |
| [HDFS-7890](https://issues.apache.org/jira/browse/HDFS-7890) | Improve information on Top users for metrics in RollingWindowsManager and lower log level |  Major | . | J.Andreina | J.Andreina |
| [HDFS-4396](https://issues.apache.org/jira/browse/HDFS-4396) | Add START\_MSG/SHUTDOWN\_MSG for ZKFC |  Major | auto-failover, ha, tools | Liang Xie | Liang Xie |
| [HADOOP-11660](https://issues.apache.org/jira/browse/HADOOP-11660) | Add support for hardware crc of HDFS checksums on ARM aarch64 architecture |  Minor | native | Edward Nevill | Edward Nevill |
| [HDFS-7645](https://issues.apache.org/jira/browse/HDFS-7645) | Rolling upgrade is restoring blocks from trash multiple times |  Major | datanode | Nathan Roberts | Keisuke Ogiwara |
| [HDFS-3918](https://issues.apache.org/jira/browse/HDFS-3918) | EditLogTailer shouldn't log WARN when other node is in standby mode |  Major | ha | Todd Lipcon | Todd Lipcon |
| [HDFS-7944](https://issues.apache.org/jira/browse/HDFS-7944) | Minor cleanup of BlockPoolManager#getAllNamenodeThreads |  Minor | . | Arpit Agarwal | Arpit Agarwal |
| [YARN-3258](https://issues.apache.org/jira/browse/YARN-3258) | FairScheduler: Need to add more logging to investigate allocations |  Minor | fairscheduler | Anubhav Dhoot | Anubhav Dhoot |
| [HDFS-7671](https://issues.apache.org/jira/browse/HDFS-7671) | hdfs user guide should point to the common rack awareness doc |  Major | documentation | Allen Wittenauer | Kai Sasaki |
| [YARN-3412](https://issues.apache.org/jira/browse/YARN-3412) | RM tests should use MockRM where possible |  Major | resourcemanager, test | Karthik Kambatla | Karthik Kambatla |
| [YARN-3428](https://issues.apache.org/jira/browse/YARN-3428) | Debug log resources to be localized for a container |  Trivial | nodemanager | Karthik Kambatla | Karthik Kambatla |
| [YARN-3424](https://issues.apache.org/jira/browse/YARN-3424) | Change logs for ContainerMonitorImpl's resourse monitoring from info to debug |  Major | nodemanager | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-3248](https://issues.apache.org/jira/browse/YARN-3248) | Display count of nodes blacklisted by apps in the web UI |  Major | capacityscheduler, resourcemanager | Varun Vasudev | Varun Vasudev |
| [HDFS-7978](https://issues.apache.org/jira/browse/HDFS-7978) | Add LOG.isDebugEnabled() guard for some LOG.debug(..) |  Major | . | Walter Su | Walter Su |
| [HDFS-8008](https://issues.apache.org/jira/browse/HDFS-8008) | Support client-side back off when the datanodes are congested |  Major | hdfs-client | Haohui Mai | Haohui Mai |
| [HDFS-7888](https://issues.apache.org/jira/browse/HDFS-7888) | Change DataStreamer/DFSOutputStream/DFSPacket for convenience of subclassing |  Minor | hdfs-client | Li Bo | Li Bo |
| [HDFS-8035](https://issues.apache.org/jira/browse/HDFS-8035) | Move checkBlocksProperlyReplicated() in FSNamesystem to BlockManager |  Minor | namenode | Haohui Mai | Haohui Mai |
| [HADOOP-9805](https://issues.apache.org/jira/browse/HADOOP-9805) | Refactor RawLocalFileSystem#rename for improved testability. |  Minor | fs, test | Chris Nauroth | Jean-Pierre Matsumoto |
| [HADOOP-11785](https://issues.apache.org/jira/browse/HADOOP-11785) | Reduce number of listStatus operation in distcp buildListing() |  Minor | tools/distcp | Zoran Dimitrijevic | Zoran Dimitrijevic |
| [HADOOP-11717](https://issues.apache.org/jira/browse/HADOOP-11717) | Add Redirecting WebSSO behavior with JWT Token in Hadoop Auth |  Major | security | Larry McCay | Larry McCay |
| [YARN-3294](https://issues.apache.org/jira/browse/YARN-3294) | Allow dumping of Capacity Scheduler debug logs via web UI for a fixed time period |  Major | capacityscheduler | Varun Vasudev | Varun Vasudev |
| [HDFS-8073](https://issues.apache.org/jira/browse/HDFS-8073) | Split BlockPlacementPolicyDefault.chooseTarget(..) so it can be easily overrided. |  Trivial | namenode | Walter Su | Walter Su |
| [HDFS-8076](https://issues.apache.org/jira/browse/HDFS-8076) | Code cleanup for DFSInputStream: use offset instead of LocatedBlock when possible |  Major | . | Zhe Zhang | Zhe Zhang |
| [HDFS-7979](https://issues.apache.org/jira/browse/HDFS-7979) | Initialize block report IDs with a random number |  Minor | datanode | Andrew Wang | Andrew Wang |
| [HDFS-8101](https://issues.apache.org/jira/browse/HDFS-8101) | DFSClient use of non-constant DFSConfigKeys pulls in WebHDFS classes at runtime |  Minor | hdfs-client | Sean Busbey | Sean Busbey |
| [YARN-3293](https://issues.apache.org/jira/browse/YARN-3293) | Track and display capacity scheduler health metrics in web UI |  Major | capacityscheduler | Varun Vasudev | Varun Vasudev |
| [MAPREDUCE-6291](https://issues.apache.org/jira/browse/MAPREDUCE-6291) | Correct mapred queue usage command |  Minor | client | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6307](https://issues.apache.org/jira/browse/MAPREDUCE-6307) | Remove property mapreduce.tasktracker.taskmemorymanager.monitoringinterval |  Minor | . | Akira Ajisaka | J.Andreina |
| [YARN-3348](https://issues.apache.org/jira/browse/YARN-3348) | Add a 'yarn top' tool to help understand cluster usage |  Major | resourcemanager | Varun Vasudev | Varun Vasudev |
| [YARN-3469](https://issues.apache.org/jira/browse/YARN-3469) | ZKRMStateStore: Avoid setting watches that are not required |  Minor | . | Jun Gong | Jun Gong |
| [HDFS-8117](https://issues.apache.org/jira/browse/HDFS-8117) | More accurate verification in SimulatedFSDataset: replace DEFAULT\_DATABYTE with patterned data |  Major | . | Zhe Zhang | Zhe Zhang |
| [HDFS-8144](https://issues.apache.org/jira/browse/HDFS-8144) | Split TestLazyPersistFiles into multiple tests |  Major | test | Arpit Agarwal | Arpit Agarwal |
| [YARN-3404](https://issues.apache.org/jira/browse/YARN-3404) | View the queue name to YARN Application page |  Minor | . | Ryu Kobayashi | Ryu Kobayashi |
| [YARN-3451](https://issues.apache.org/jira/browse/YARN-3451) | Add start time and Elapsed in ApplicationAttemptReport and display the same in RMAttemptBlock WebUI |  Major | api, webapp | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-7863](https://issues.apache.org/jira/browse/HDFS-7863) | Missing description of some methods and parameters in javadoc of FSDirDeleteOp |  Minor | . | Yongjun Zhang | Brahma Reddy Battula |
| [HDFS-8152](https://issues.apache.org/jira/browse/HDFS-8152) | Refactoring of lazy persist storage cases |  Major | test | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8133](https://issues.apache.org/jira/browse/HDFS-8133) | Improve readability of deleted block check |  Major | namenode | Daryn Sharp | Daryn Sharp |
| [HADOOP-11812](https://issues.apache.org/jira/browse/HADOOP-11812) | Implement listLocatedStatus for ViewFileSystem to speed up split calculation |  Blocker | fs | Gera Shegalov | Gera Shegalov |
| [MAPREDUCE-6297](https://issues.apache.org/jira/browse/MAPREDUCE-6297) | Task Id of the failed task in diagnostics should link to the task page |  Minor | jobhistoryserver | Siqi Li | Siqi Li |
| [HADOOP-11827](https://issues.apache.org/jira/browse/HADOOP-11827) | Speed-up distcp buildListing() using threadpool |  Major | tools/distcp | Zoran Dimitrijevic | Zoran Dimitrijevic |
| [YARN-3494](https://issues.apache.org/jira/browse/YARN-3494) | Expose AM resource limit and usage in QueueMetrics |  Major | . | Jian He | Rohith Sharma K S |
| [YARN-3503](https://issues.apache.org/jira/browse/YARN-3503) | Expose disk utilization percentage and bad local and log dir counts on NM via JMX |  Major | nodemanager | Varun Vasudev | Varun Vasudev |
| [YARN-3410](https://issues.apache.org/jira/browse/YARN-3410) | YARN admin should be able to remove individual application records from RMStateStore |  Critical | resourcemanager, yarn | Wangda Tan | Rohith Sharma K S |
| [HDFS-8215](https://issues.apache.org/jira/browse/HDFS-8215) | Refactor NamenodeFsck#check method |  Minor | namenode | Takanobu Asanuma | Takanobu Asanuma |
| [YARN-3511](https://issues.apache.org/jira/browse/YARN-3511) | Add errors and warnings page to ATS |  Major | timelineserver | Varun Vasudev | Varun Vasudev |
| [HDFS-8176](https://issues.apache.org/jira/browse/HDFS-8176) | Record from/to snapshots in audit log for snapshot diff report |  Minor | snapshots | J.Andreina | J.Andreina |
| [YARN-3406](https://issues.apache.org/jira/browse/YARN-3406) | Display count of running containers in the RM's Web UI |  Minor | . | Ryu Kobayashi | Ryu Kobayashi |
| [HADOOP-11357](https://issues.apache.org/jira/browse/HADOOP-11357) | Print information of the build enviornment in test-patch.sh |  Minor | scripts | Haohui Mai | Allen Wittenauer |
| [HDFS-8204](https://issues.apache.org/jira/browse/HDFS-8204) | Mover/Balancer should not schedule two replicas to the same DN |  Minor | balancer & mover | Walter Su | Walter Su |
| [HDFS-8280](https://issues.apache.org/jira/browse/HDFS-8280) | Code Cleanup in DFSInputStream |  Minor | . | Jing Zhao | Jing Zhao |
| [HDFS-8283](https://issues.apache.org/jira/browse/HDFS-8283) | DataStreamer cleanup and some minor improvement |  Minor | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-5574](https://issues.apache.org/jira/browse/HDFS-5574) | Remove buffer copy in BlockReader.skip |  Trivial | . | Binglin Chang | Binglin Chang |
| [HDFS-7770](https://issues.apache.org/jira/browse/HDFS-7770) | Need document for storage type label of data node storage locations under dfs.datanode.data.dir |  Major | documentation | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-8200](https://issues.apache.org/jira/browse/HDFS-8200) | Refactor FSDirStatAndListingOp |  Major | . | Haohui Mai | Haohui Mai |
| [YARN-3363](https://issues.apache.org/jira/browse/YARN-3363) | add localization and container launch time to ContainerMetrics at NM to show these timing information for each active container. |  Major | nodemanager | zhihai xu | zhihai xu |
| [HDFS-7397](https://issues.apache.org/jira/browse/HDFS-7397) | Add more detail to the documentation for the conf key "dfs.client.read.shortcircuit.streams.cache.size" |  Minor | hdfs-client | Tsz Wo Nicholas Sze | Brahma Reddy Battula |
| [YARN-2980](https://issues.apache.org/jira/browse/YARN-2980) | Move health check script related functionality to hadoop-common |  Blocker | . | Ming Ma | Varun Saxena |
| [HADOOP-11911](https://issues.apache.org/jira/browse/HADOOP-11911) | test-patch should allow configuration of default branch |  Minor | . | Sean Busbey | Sean Busbey |
| [HDFS-7758](https://issues.apache.org/jira/browse/HDFS-7758) | Retire FsDatasetSpi#getVolumes() and use FsDatasetSpi#getVolumeRefs() instead |  Major | datanode | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HADOOP-11925](https://issues.apache.org/jira/browse/HADOOP-11925) | backport trunk's smart-apply-patch.sh to branch-2 |  Major | scripts | Allen Wittenauer | Allen Wittenauer |
| [MAPREDUCE-6192](https://issues.apache.org/jira/browse/MAPREDUCE-6192) | Create unit test to automatically compare MR related classes and mapred-default.xml |  Minor | . | Ray Chiang | Ray Chiang |
| [HADOOP-11813](https://issues.apache.org/jira/browse/HADOOP-11813) | releasedocmaker.py should use today's date instead of unreleased |  Minor | build | Allen Wittenauer | Darrell Taylor |
| [YARN-3491](https://issues.apache.org/jira/browse/YARN-3491) | PublicLocalizer#addResource is too slow. |  Critical | nodemanager | zhihai xu | zhihai xu |
| [MAPREDUCE-6279](https://issues.apache.org/jira/browse/MAPREDUCE-6279) | AM should explicity exit JVM after all services have stopped |  Major | . | Jason Lowe | Eric Payne |
| [HDFS-8108](https://issues.apache.org/jira/browse/HDFS-8108) | Fsck should provide the info on mandatory option to be used along with "-blocks , -locations and -racks" |  Trivial | documentation | J.Andreina | J.Andreina |
| [HDFS-8207](https://issues.apache.org/jira/browse/HDFS-8207) | Improper log message when blockreport interval compared with initial delay |  Minor | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6079](https://issues.apache.org/jira/browse/MAPREDUCE-6079) | Rename JobImpl#username to reporterUserName |  Major | . | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| [HDFS-8209](https://issues.apache.org/jira/browse/HDFS-8209) | Support different number of datanode directories in MiniDFSCluster. |  Minor | test | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [YARN-3169](https://issues.apache.org/jira/browse/YARN-3169) | Drop YARN's overview document |  Major | documentation | Allen Wittenauer | Brahma Reddy Battula |
| [YARN-2784](https://issues.apache.org/jira/browse/YARN-2784) | Make POM project names consistent |  Minor | build | Rohith Sharma K S | Rohith Sharma K S |
| [MAPREDUCE-5981](https://issues.apache.org/jira/browse/MAPREDUCE-5981) | Log levels of certain MR logs can be changed to DEBUG |  Major | . | Varun Saxena | Varun Saxena |
| [HADOOP-6842](https://issues.apache.org/jira/browse/HADOOP-6842) | "hadoop fs -text" does not give a useful text representation of MapWritable objects |  Major | io | Steven K. Wong | Akira Ajisaka |
| [YARN-20](https://issues.apache.org/jira/browse/YARN-20) | More information for "yarn.resourcemanager.webapp.address" in yarn-default.xml |  Trivial | documentation, resourcemanager | Nemon Lou | Bartosz Ługowski |
| [HDFS-5640](https://issues.apache.org/jira/browse/HDFS-5640) | Add snapshot methods to FileContext. |  Major | hdfs-client, snapshots | Chris Nauroth | Rakesh R |
| [HDFS-8284](https://issues.apache.org/jira/browse/HDFS-8284) | Update documentation about how to use HTrace with HDFS |  Major | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-7433](https://issues.apache.org/jira/browse/HDFS-7433) | Optimize performance of DatanodeManager's node map |  Critical | namenode | Daryn Sharp | Daryn Sharp |
| [MAPREDUCE-5248](https://issues.apache.org/jira/browse/MAPREDUCE-5248) | Let NNBenchWithoutMR specify the replication factor for its test |  Minor | client, test | Erik Paulson | Erik Paulson |
| [HADOOP-9737](https://issues.apache.org/jira/browse/HADOOP-9737) | JarFinder#getJar should delete the jar file upon destruction of the JVM |  Major | util | Esteban Gutierrez | Jean-Baptiste Onofré |
| [YARN-1050](https://issues.apache.org/jira/browse/YARN-1050) | Document the Fair Scheduler REST API |  Major | documentation, fairscheduler | Sandy Ryza | Kenji Kikushima |
| [YARN-3271](https://issues.apache.org/jira/browse/YARN-3271) | FairScheduler: Move tests related to max-runnable-apps from TestFairScheduler to TestAppRunnability |  Major | . | Karthik Kambatla | nijel |
| [YARN-2206](https://issues.apache.org/jira/browse/YARN-2206) | Update document for applications REST API response examples |  Minor | documentation | Kenji Kikushima | Brahma Reddy Battula |
| [HDFS-6757](https://issues.apache.org/jira/browse/HDFS-6757) | Simplify lease manager with INodeID |  Major | . | Haohui Mai | Haohui Mai |
| [HDFS-8327](https://issues.apache.org/jira/browse/HDFS-8327) | Simplify quota calculations for snapshots and truncate |  Major | . | Haohui Mai | Haohui Mai |
| [YARN-1287](https://issues.apache.org/jira/browse/YARN-1287) | Consolidate MockClocks |  Major | . | Sandy Ryza | Sebastian Wong |
| [HDFS-8357](https://issues.apache.org/jira/browse/HDFS-8357) | Consolidate parameters of INode.CleanSubtree() into a parameter objects. |  Major | . | Haohui Mai | Li Lu |
| [HADOOP-11950](https://issues.apache.org/jira/browse/HADOOP-11950) | Add cli option to test-patch to set the project-under-test |  Minor | . | Sean Busbey | Sean Busbey |
| [HADOOP-11948](https://issues.apache.org/jira/browse/HADOOP-11948) | test-patch's issue matching regex should be configurable. |  Major | . | Sean Busbey | Sean Busbey |
| [MAPREDUCE-5465](https://issues.apache.org/jira/browse/MAPREDUCE-5465) | Tasks are often killed before they exit on their own |  Major | mr-am, mrv2 | Radim Kolar | Ming Ma |
| [YARN-3513](https://issues.apache.org/jira/browse/YARN-3513) | Remove unused variables in ContainersMonitorImpl and add debug log for overall resource usage by all containers |  Trivial | nodemanager | Naganarasimha G R | Naganarasimha G R |
| [HDFS-8255](https://issues.apache.org/jira/browse/HDFS-8255) | Rename getBlockReplication to getPreferredBlockReplication |  Major | . | Zhe Zhang | Zhe Zhang |
| [YARN-3613](https://issues.apache.org/jira/browse/YARN-3613) | TestContainerManagerSecurity should init and start Yarn cluster in setup instead of individual methods |  Minor | test | Karthik Kambatla | nijel |
| [HDFS-6184](https://issues.apache.org/jira/browse/HDFS-6184) | Capture NN's thread dump when it fails over |  Major | namenode | Ming Ma | Ming Ma |
| [YARN-3539](https://issues.apache.org/jira/browse/YARN-3539) | Compatibility doc to state that ATS v1 is a stable REST API |  Major | documentation | Steve Loughran | Steve Loughran |
| [HADOOP-9723](https://issues.apache.org/jira/browse/HADOOP-9723) | Improve error message when hadoop archive output path already exists |  Trivial | . | Stephen Chu | Yongjun Zhang |
| [HADOOP-11713](https://issues.apache.org/jira/browse/HADOOP-11713) | ViewFileSystem should support snapshot methods. |  Major | fs | Chris Nauroth | Rakesh R |
| [HDFS-8350](https://issues.apache.org/jira/browse/HDFS-8350) | Remove old webhdfs.xml and other outdated documentation stuff |  Major | documentation | Akira Ajisaka | Brahma Reddy Battula |
| [HADOOP-11960](https://issues.apache.org/jira/browse/HADOOP-11960) | Enable Azure-Storage Client Side logging. |  Major | tools | Dushyanth | Dushyanth |
| [HDFS-6888](https://issues.apache.org/jira/browse/HDFS-6888) | Allow selectively audit logging ops |  Major | . | Kihwal Lee | Chen He |
| [HDFS-8397](https://issues.apache.org/jira/browse/HDFS-8397) | Refactor the error handling code in DataStreamer |  Minor | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8394](https://issues.apache.org/jira/browse/HDFS-8394) | Move getAdditionalBlock() and related functionalities into a separate class |  Major | . | Haohui Mai | Haohui Mai |
| [HADOOP-11939](https://issues.apache.org/jira/browse/HADOOP-11939) | Deprecate DistCpV1 and Logalyzer |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-4185](https://issues.apache.org/jira/browse/HDFS-4185) | Add a metric for number of active leases |  Major | namenode | Kihwal Lee | Rakesh R |
| [HADOOP-1540](https://issues.apache.org/jira/browse/HADOOP-1540) | Support file exclusion list in distcp |  Minor | util | Senthil Subramanian | Rich Haase |
| [HADOOP-11103](https://issues.apache.org/jira/browse/HADOOP-11103) | Clean up RemoteException |  Trivial | ipc | Sean Busbey | Sean Busbey |
| [HDFS-8131](https://issues.apache.org/jira/browse/HDFS-8131) | Implement a space balanced block placement policy |  Minor | namenode | Liu Shaohui | Liu Shaohui |
| [HADOOP-11970](https://issues.apache.org/jira/browse/HADOOP-11970) | Replace uses of ThreadLocal\<Random\> with JDK7 ThreadLocalRandom |  Major | . | Sean Busbey | Sean Busbey |
| [HADOOP-11995](https://issues.apache.org/jira/browse/HADOOP-11995) | Make jetty version configurable from the maven command line |  Trivial | build, ld | sriharsha devineni | sriharsha devineni |
| [HDFS-4383](https://issues.apache.org/jira/browse/HDFS-4383) | Document the lease limits |  Minor | . | Eli Collins | Mohammad Arshad |
| [HADOOP-10366](https://issues.apache.org/jira/browse/HADOOP-10366) | Add whitespaces between the classes for values in core-default.xml to fit better in browser |  Minor | documentation | Chengwei Yang | Kanaka Kumar Avvaru |
| [HADOOP-11594](https://issues.apache.org/jira/browse/HADOOP-11594) | Improve the readability of site index of documentation |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-160](https://issues.apache.org/jira/browse/YARN-160) | nodemanagers should obtain cpu/memory values from underlying OS |  Major | nodemanager | Alejandro Abdelnur | Varun Vasudev |
| [HADOOP-11242](https://issues.apache.org/jira/browse/HADOOP-11242) | Record the time of calling in tracing span of IPC server |  Minor | ipc | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3722](https://issues.apache.org/jira/browse/YARN-3722) | Merge multiple TestWebAppUtils into o.a.h.yarn.webapp.util.TestWebAppUtils |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-11894](https://issues.apache.org/jira/browse/HADOOP-11894) | Bump the version of Apache HTrace to 3.2.0-incubating |  Major | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3489](https://issues.apache.org/jira/browse/YARN-3489) | RMServerUtils.validateResourceRequests should only obtain queue info once |  Major | resourcemanager | Jason Lowe | Varun Saxena |
| [HDFS-8443](https://issues.apache.org/jira/browse/HDFS-8443) | Document dfs.namenode.service.handler.count in hdfs-site.xml |  Major | documentation | Akira Ajisaka | J.Andreina |
| [YARN-3547](https://issues.apache.org/jira/browse/YARN-3547) | FairScheduler: Apps that have no resource demand should not participate scheduling |  Major | fairscheduler | Xianyin Xin | Xianyin Xin |
| [YARN-3713](https://issues.apache.org/jira/browse/YARN-3713) | Remove duplicate function call storeContainerDiagnostics in ContainerDiagnosticsUpdateTransition |  Minor | nodemanager | zhihai xu | zhihai xu |
| [HADOOP-12043](https://issues.apache.org/jira/browse/HADOOP-12043) | Display warning if defaultFs is not set when running fs commands. |  Minor | fs | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [YARN-3467](https://issues.apache.org/jira/browse/YARN-3467) | Expose allocatedMB, allocatedVCores, and runningContainers metrics on running Applications in RM Web UI |  Minor | webapp, yarn | Anthony Rojas | Anubhav Dhoot |
| [HDFS-8490](https://issues.apache.org/jira/browse/HDFS-8490) | Typo in trace enabled log in ExceptionHandler of WebHDFS |  Trivial | webhdfs | Jakob Homan | Archana T |
| [HDFS-8521](https://issues.apache.org/jira/browse/HDFS-8521) | Add @VisibleForTesting annotation to {{BlockPoolSlice#selectReplicaToDelete}} |  Trivial | . | Colin P. McCabe | Colin P. McCabe |
| [MAPREDUCE-6174](https://issues.apache.org/jira/browse/MAPREDUCE-6174) | Combine common stream code into parent class for InMemoryMapOutput and OnDiskMapOutput. |  Major | mrv2 | Eric Payne | Eric Payne |
| [HDFS-8532](https://issues.apache.org/jira/browse/HDFS-8532) | Make the visibility of DFSOutputStream#streamer member variable to private |  Trivial | . | Rakesh R | Rakesh R |
| [HDFS-8535](https://issues.apache.org/jira/browse/HDFS-8535) | Clarify that dfs usage in dfsadmin -report output includes all block replicas. |  Minor | documentation | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [MAPREDUCE-6383](https://issues.apache.org/jira/browse/MAPREDUCE-6383) | Pi job (QuasiMonteCarlo) should not try to read the results file if its job fails |  Major | examples | Harsh J | Harsh J |
| [YARN-3259](https://issues.apache.org/jira/browse/YARN-3259) | FairScheduler: Trigger fairShare updates on node events |  Major | fairscheduler | Anubhav Dhoot | Anubhav Dhoot |
| [HADOOP-12059](https://issues.apache.org/jira/browse/HADOOP-12059) | S3Credentials should support use of CredentialProvider |  Major | fs/s3 | Sean Busbey | Sean Busbey |
| [MAPREDUCE-6354](https://issues.apache.org/jira/browse/MAPREDUCE-6354) | ShuffleHandler should be able to log shuffle connections |  Major | . | Chang Li | Chang Li |
| [HADOOP-12055](https://issues.apache.org/jira/browse/HADOOP-12055) | Deprecate usage of NativeIO#link |  Major | native | Andrew Wang | Andrew Wang |
| [HDFS-8432](https://issues.apache.org/jira/browse/HDFS-8432) | Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade use cases. |  Major | namenode, rolling upgrades | Chris Nauroth | Chris Nauroth |
| [HDFS-8116](https://issues.apache.org/jira/browse/HDFS-8116) | Cleanup uncessary if LOG.isDebugEnabled() from RollingWindowManager |  Trivial | namenode | Xiaoyu Yao | Brahma Reddy Battula |
| [YARN-2716](https://issues.apache.org/jira/browse/YARN-2716) | Refactor ZKRMStateStore retry code with Apache Curator |  Major | . | Jian He | Karthik Kambatla |
| [HDFS-8553](https://issues.apache.org/jira/browse/HDFS-8553) | Document hdfs class path options |  Major | documentation | Xiaoyu Yao | Brahma Reddy Battula |
| [YARN-3786](https://issues.apache.org/jira/browse/YARN-3786) | Document yarn class path options |  Major | documentation | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6392](https://issues.apache.org/jira/browse/MAPREDUCE-6392) | Document mapred class path options |  Major | documentation | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-8549](https://issues.apache.org/jira/browse/HDFS-8549) | Abort the balancer if an upgrade is in progress |  Major | balancer & mover | Andrew Wang | Andrew Wang |
| [HDFS-8573](https://issues.apache.org/jira/browse/HDFS-8573) | Move creation of restartMeta file logic from BlockReceiver to ReplicaInPipeline |  Major | datanode | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HADOOP-11971](https://issues.apache.org/jira/browse/HADOOP-11971) | Move test utilities for tracing from hadoop-hdfs to hadoop-common |  Minor | tracing | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8361](https://issues.apache.org/jira/browse/HDFS-8361) | Choose SSD over DISK in block placement |  Major | namenode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [YARN-3789](https://issues.apache.org/jira/browse/YARN-3789) | Improve logs for LeafQueue#activateApplications() |  Minor | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-8606](https://issues.apache.org/jira/browse/HDFS-8606) | Cleanup DFSOutputStream by removing unwanted changes |  Minor | hdfs-client | Rakesh R | Rakesh R |
| [YARN-3148](https://issues.apache.org/jira/browse/YARN-3148) | Allow CORS related headers to passthrough in WebAppProxyServlet |  Major | . | Prakash Ramachandran | Varun Saxena |
| [HDFS-8589](https://issues.apache.org/jira/browse/HDFS-8589) | Fix unused imports in BPServiceActor and BlockReportLeaseManager |  Trivial | . | Colin P. McCabe | Colin P. McCabe |
| [HADOOP-7139](https://issues.apache.org/jira/browse/HADOOP-7139) | Allow appending to existing SequenceFiles |  Major | io | Stephen Rose | Kanaka Kumar Avvaru |
| [HDFS-8605](https://issues.apache.org/jira/browse/HDFS-8605) | Merge Refactor of DFSOutputStream from HDFS-7285 branch |  Major | . | Vinayakumar B | Vinayakumar B |
| [MAPREDUCE-6395](https://issues.apache.org/jira/browse/MAPREDUCE-6395) | Improve the commit failure messages in MRAppMaster recovery |  Major | applicationmaster | Gera Shegalov | Brahma Reddy Battula |
| [HDFS-8582](https://issues.apache.org/jira/browse/HDFS-8582) | Support getting a list of reconfigurable config properties and do not generate spurious reconfig warnings |  Minor | datanode, hdfs-client | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [MAPREDUCE-6316](https://issues.apache.org/jira/browse/MAPREDUCE-6316) | Task Attempt List entries should link to the task overview |  Major | . | Siqi Li | Siqi Li |
| [MAPREDUCE-6305](https://issues.apache.org/jira/browse/MAPREDUCE-6305) | AM/Task log page should be able to link back to the job |  Major | . | Siqi Li | Siqi Li |
| [YARN-3834](https://issues.apache.org/jira/browse/YARN-3834) | Scrub debug logging of tokens during resource localization. |  Major | nodemanager | Chris Nauroth | Chris Nauroth |
| [MAPREDUCE-6408](https://issues.apache.org/jira/browse/MAPREDUCE-6408) | Queue name and user name should be printed on the job page |  Major | applicationmaster | Siqi Li | Siqi Li |
| [HDFS-8639](https://issues.apache.org/jira/browse/HDFS-8639) | Option for HTTP port of NameNode by MiniDFSClusterManager |  Minor | test | Kai Sasaki | Kai Sasaki |
| [YARN-3360](https://issues.apache.org/jira/browse/YARN-3360) | Add JMX metrics to TimelineDataManager |  Major | timelineserver | Jason Lowe | Jason Lowe |
| [HADOOP-12049](https://issues.apache.org/jira/browse/HADOOP-12049) | Control http authentication cookie persistence via configuration |  Major | security | Benoy Antony | Huizhi Lu |
| [HDFS-8462](https://issues.apache.org/jira/browse/HDFS-8462) | Implement GETXATTRS and LISTXATTRS operations for WebImageViewer |  Major | . | Akira Ajisaka | Jagadesh Kiran N |
| [HDFS-8640](https://issues.apache.org/jira/browse/HDFS-8640) | Make reserved RBW space visible through JMX |  Major | . | Kanaka Kumar Avvaru | Kanaka Kumar Avvaru |
| [HDFS-8546](https://issues.apache.org/jira/browse/HDFS-8546) | Use try with resources in DataStorage and Storage |  Minor | datanode | Andrew Wang | Andrew Wang |
| [HADOOP-11807](https://issues.apache.org/jira/browse/HADOOP-11807) | add a lint mode to releasedocmaker |  Minor | build, documentation, yetus | Allen Wittenauer | ramtin |
| [HDFS-8653](https://issues.apache.org/jira/browse/HDFS-8653) | Code cleanup for DatanodeManager, DatanodeDescriptor and DatanodeStorageInfo |  Major | . | Zhe Zhang | Zhe Zhang |
| [HDFS-8659](https://issues.apache.org/jira/browse/HDFS-8659) | Block scanner INFO message is spamming logs |  Major | datanode | Yongjun Zhang | Yongjun Zhang |
| [MAPREDUCE-6384](https://issues.apache.org/jira/browse/MAPREDUCE-6384) | Add the last reporting reducer info for too many fetch failure diagnostics |  Major | . | Chang Li | Chang Li |
| [HADOOP-12158](https://issues.apache.org/jira/browse/HADOOP-12158) | Improve error message in TestCryptoStreamsWithOpensslAesCtrCryptoCodec when OpenSSL is not installed |  Trivial | test | Andrew Wang | Andrew Wang |
| [HADOOP-12172](https://issues.apache.org/jira/browse/HADOOP-12172) | FsShell mkdir -p makes an unnecessary check for the existence of the parent. |  Minor | fs | Chris Nauroth | Chris Nauroth |
| [HDFS-8703](https://issues.apache.org/jira/browse/HDFS-8703) | Merge refactor of DFSInputStream from ErasureCoding branch |  Major | . | Vinayakumar B | Vinayakumar B |
| [HDFS-8709](https://issues.apache.org/jira/browse/HDFS-8709) | Clarify automatic sync in FSEditLog#logEdit |  Minor | . | Andrew Wang | Andrew Wang |
| [HADOOP-12045](https://issues.apache.org/jira/browse/HADOOP-12045) | Enable LocalFileSystem#setTimes to change atime |  Minor | fs | Kazuho Fujii | Kazuho Fujii |
| [HADOOP-12185](https://issues.apache.org/jira/browse/HADOOP-12185) | NetworkTopology is not efficient adding/getting/removing nodes |  Major | . | Inigo Goiri | Inigo Goiri |
| [HADOOP-12135](https://issues.apache.org/jira/browse/HADOOP-12135) | cleanup releasedocmaker |  Major | yetus | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-12195](https://issues.apache.org/jira/browse/HADOOP-12195) | Add annotation to package-info.java file to workaround MCOMPILER-205 |  Trivial | . | Andrew Wang | Andrew Wang |
| [HADOOP-12193](https://issues.apache.org/jira/browse/HADOOP-12193) | Rename Touchz.java to Touch.java |  Trivial | . | Andrew Wang | Andrew Wang |
| [HDFS-8711](https://issues.apache.org/jira/browse/HDFS-8711) | setSpaceQuota command should print the available storage type when input storage type is wrong |  Major | hdfs-client | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-8712](https://issues.apache.org/jira/browse/HDFS-8712) | Remove "public" and "abstract" modifiers in FsVolumeSpi and FsDatasetSpi |  Trivial | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HADOOP-12194](https://issues.apache.org/jira/browse/HADOOP-12194) | Support for incremental generation in the protoc plugin |  Major | . | Andrew Wang | Andrew Wang |
| [HADOOP-12180](https://issues.apache.org/jira/browse/HADOOP-12180) | Move ResourceCalculatorPlugin from YARN to Common |  Major | util | Chris Douglas | Chris Douglas |
| [HADOOP-12210](https://issues.apache.org/jira/browse/HADOOP-12210) | Collect network usage on the node |  Major | . | Robert Grandl | Robert Grandl |
| [YARN-3069](https://issues.apache.org/jira/browse/YARN-3069) | Document missing properties in yarn-default.xml |  Major | documentation | Ray Chiang | Ray Chiang |
| [YARN-3381](https://issues.apache.org/jira/browse/YARN-3381) | Fix typo InvalidStateTransitonException |  Minor | api | Xiaoshuang LU | Brahma Reddy Battula |
| [HADOOP-12211](https://issues.apache.org/jira/browse/HADOOP-12211) | Collect disks usages on the node |  Major | . | Robert Grandl | Robert Grandl |
| [HDFS-8722](https://issues.apache.org/jira/browse/HDFS-8722) | Optimize datanode writes for small writes and flushes |  Critical | . | Kihwal Lee | Kihwal Lee |
| [HADOOP-12232](https://issues.apache.org/jira/browse/HADOOP-12232) | Upgrade Tomcat dependency to 6.0.44. |  Major | build | Chris Nauroth | Chris Nauroth |
| [YARN-3170](https://issues.apache.org/jira/browse/YARN-3170) | YARN architecture document needs updating |  Major | documentation | Allen Wittenauer | Brahma Reddy Battula |
| [MAPREDUCE-5762](https://issues.apache.org/jira/browse/MAPREDUCE-5762) | Port MAPREDUCE-3223 and MAPREDUCE-4695 (Remove MRv1 config from mapred-default.xml) to branch-2 |  Minor | documentation | Akira Ajisaka | Akira Ajisaka |
| [YARN-3174](https://issues.apache.org/jira/browse/YARN-3174) | Consolidate the NodeManager and NodeManagerRestart documentation into one |  Major | documentation | Allen Wittenauer | Masatake Iwasaki |
| [HDFS-7314](https://issues.apache.org/jira/browse/HDFS-7314) | When the DFSClient lease cannot be renewed, abort open-for-write files rather than the entire DFSClient |  Major | . | Ming Ma | Ming Ma |
| [HADOOP-11893](https://issues.apache.org/jira/browse/HADOOP-11893) | Mark org.apache.hadoop.security.token.Token as @InterfaceAudience.Public |  Major | security | Steve Loughran | Brahma Reddy Battula |
| [HADOOP-12081](https://issues.apache.org/jira/browse/HADOOP-12081) | Fix UserGroupInformation.java to support 64-bit zLinux |  Major | security | Adam Roberts | Akira Ajisaka |
| [HADOOP-12214](https://issues.apache.org/jira/browse/HADOOP-12214) | Parse 'HadoopArchive' commandline using cli Options. |  Minor | . | Vinayakumar B | Vinayakumar B |
| [YARN-2921](https://issues.apache.org/jira/browse/YARN-2921) | Fix MockRM/MockAM#waitForState sleep too long |  Major | test | Karthik Kambatla | Tsuyoshi Ozawa |
| [HADOOP-12161](https://issues.apache.org/jira/browse/HADOOP-12161) | Add getStoragePolicy API to the FileSystem interface |  Major | fs | Arpit Agarwal | Brahma Reddy Battula |
| [HADOOP-12189](https://issues.apache.org/jira/browse/HADOOP-12189) | Improve CallQueueManager#swapQueue to make queue elements drop nearly impossible. |  Major | ipc, test | zhihai xu | zhihai xu |
| [HADOOP-12009](https://issues.apache.org/jira/browse/HADOOP-12009) | Clarify FileSystem.listStatus() sorting order & fix FileSystemContractBaseTest:testListStatus |  Minor | documentation, fs, test | Jakob Homan | J.Andreina |
| [HADOOP-12259](https://issues.apache.org/jira/browse/HADOOP-12259) | Utility to Dynamic port allocation |  Major | test, util | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-8735](https://issues.apache.org/jira/browse/HDFS-8735) | Inotify : All events classes should implement toString() API. |  Major | hdfs-client | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-7858](https://issues.apache.org/jira/browse/HDFS-7858) | Improve HA Namenode Failover detection on the client |  Major | hdfs-client | Arun Suresh | Arun Suresh |
| [HDFS-8180](https://issues.apache.org/jira/browse/HDFS-8180) | AbstractFileSystem Implementation for WebHdfs |  Major | webhdfs | Santhosh G Nayak | Santhosh G Nayak |
| [HDFS-8811](https://issues.apache.org/jira/browse/HDFS-8811) | Move BlockStoragePolicy name's constants from HdfsServerConstants.java to HdfsConstants.java |  Major | . | Vinayakumar B | Vinayakumar B |
| [HDFS-8822](https://issues.apache.org/jira/browse/HDFS-8822) | Add SSD storagepolicy tests in TestBlockStoragePolicy#testDefaultPolicies |  Major | . | Vinayakumar B | Vinayakumar B |
| [YARN-3950](https://issues.apache.org/jira/browse/YARN-3950) | Add unique YARN\_SHELL\_ID environment variable to DistributedShell |  Major | applications/distributed-shell | Robert Kanter | Robert Kanter |
| [YARN-2768](https://issues.apache.org/jira/browse/YARN-2768) | Avoid cloning Resource in FSAppAttempt#updateDemand |  Minor | fairscheduler | Hong Zhiguo | Hong Zhiguo |
| [HDFS-8816](https://issues.apache.org/jira/browse/HDFS-8816) | Improve visualization for the Datanode tab in the NN UI |  Major | . | Haohui Mai | Haohui Mai |
| [HDFS-8821](https://issues.apache.org/jira/browse/HDFS-8821) | Explain message "Operation category X is not supported in state standby" |  Minor | . | Gautam Gopalakrishnan | Gautam Gopalakrishnan |
| [HADOOP-12271](https://issues.apache.org/jira/browse/HADOOP-12271) | Hadoop Jar Error Should Be More Explanatory |  Minor | . | Jesse Anderson | Josh Elser |
| [HADOOP-12183](https://issues.apache.org/jira/browse/HADOOP-12183) | Annotate the HTrace span created by FsShell with the command-line arguments passed by the user |  Minor | tracing | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3978](https://issues.apache.org/jira/browse/YARN-3978) | Configurably turn off the saving of container info in Generic AHS |  Major | timelineserver, yarn | Eric Payne | Eric Payne |
| [YARN-3965](https://issues.apache.org/jira/browse/YARN-3965) | Add startup timestamp to nodemanager UI |  Minor | nodemanager | Hong Zhiguo | Hong Zhiguo |
| [HADOOP-12280](https://issues.apache.org/jira/browse/HADOOP-12280) | Skip unit tests based on maven profile rather than NativeCodeLoader.isNativeCodeLoaded |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8815](https://issues.apache.org/jira/browse/HDFS-8815) | DFS getStoragePolicy implementation using single RPC call |  Major | hdfs-client | Arpit Agarwal | Surendra Singh Lilhore |
| [YARN-3961](https://issues.apache.org/jira/browse/YARN-3961) | Expose pending, running and reserved containers of a queue in REST api and yarn top |  Major | capacityscheduler, fairscheduler, webapp | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-4019](https://issues.apache.org/jira/browse/YARN-4019) | Add JvmPauseMonitor to ResourceManager and NodeManager |  Major | nodemanager, resourcemanager | Robert Kanter | Robert Kanter |
| [MAPREDUCE-6443](https://issues.apache.org/jira/browse/MAPREDUCE-6443) | Add JvmPauseMonitor to Job History Server |  Major | jobhistoryserver | Robert Kanter | Robert Kanter |
| [HDFS-8887](https://issues.apache.org/jira/browse/HDFS-8887) | Expose storage type and storage ID in BlockLocation |  Major | . | Andrew Wang | Andrew Wang |
| [HADOOP-12318](https://issues.apache.org/jira/browse/HADOOP-12318) | Expose underlying LDAP exceptions in SaslPlainServer |  Minor | security | Mike Yoder | Mike Yoder |
| [HADOOP-12295](https://issues.apache.org/jira/browse/HADOOP-12295) | Improve NetworkTopology#InnerNode#remove logic |  Major | . | Yi Liu | Yi Liu |
| [HDFS-7649](https://issues.apache.org/jira/browse/HDFS-7649) | Multihoming docs should emphasize using hostnames in configurations |  Major | documentation | Arpit Agarwal | Brahma Reddy Battula |
| [YARN-4055](https://issues.apache.org/jira/browse/YARN-4055) | Report node resource utilization in heartbeat |  Major | nodemanager | Inigo Goiri | Inigo Goiri |
| [HDFS-8713](https://issues.apache.org/jira/browse/HDFS-8713) | Convert DatanodeDescriptor to use SLF4J logging |  Trivial | . | Andrew Wang | Andrew Wang |
| [HDFS-8883](https://issues.apache.org/jira/browse/HDFS-8883) | NameNode Metrics : Add FSNameSystem lock Queue Length |  Major | namenode | Anu Engineer | Anu Engineer |
| [HDFS-6407](https://issues.apache.org/jira/browse/HDFS-6407) | Add sorting and pagination in the datanode tab of the NN Web UI |  Critical | namenode | Nathan Roberts | Haohui Mai |
| [HDFS-8880](https://issues.apache.org/jira/browse/HDFS-8880) | NameNode metrics logging |  Major | namenode | Arpit Agarwal | Arpit Agarwal |
| [YARN-4057](https://issues.apache.org/jira/browse/YARN-4057) | If ContainersMonitor is not enabled, only print related log info one time |  Minor | nodemanager | Jun Gong | Jun Gong |
| [HADOOP-12050](https://issues.apache.org/jira/browse/HADOOP-12050) | Enable MaxInactiveInterval for hadoop http auth token |  Major | security | Benoy Antony | Huizhi Lu |
| [HDFS-8435](https://issues.apache.org/jira/browse/HDFS-8435) | Support CreateFlag in WebHdfs |  Major | webhdfs | Vinoth Sathappan | Jakob Homan |
| [HDFS-8911](https://issues.apache.org/jira/browse/HDFS-8911) | NameNode Metric : Add Editlog counters as a JMX metric |  Major | namenode | Anu Engineer | Anu Engineer |
| [HDFS-8917](https://issues.apache.org/jira/browse/HDFS-8917) | Cleanup BlockInfoUnderConstruction from comments and tests |  Minor | namenode | Zhe Zhang | Zhe Zhang |
| [HDFS-8884](https://issues.apache.org/jira/browse/HDFS-8884) | Fail-fast check in BlockPlacementPolicyDefault#chooseTarget |  Major | . | Yi Liu | Yi Liu |
| [HDFS-8828](https://issues.apache.org/jira/browse/HDFS-8828) | Utilize Snapshot diff report to build diff copy list in distcp |  Major | distcp, snapshots | Yufei Gu | Yufei Gu |
| [HDFS-8924](https://issues.apache.org/jira/browse/HDFS-8924) | Add pluggable interface for reading replicas in DFSClient |  Major | hdfs-client | Colin P. McCabe | Colin P. McCabe |
| [HDFS-8928](https://issues.apache.org/jira/browse/HDFS-8928) | Improvements for BlockUnderConstructionFeature: ReplicaUnderConstruction as a separate class and replicas as an array |  Minor | namenode | Zhe Zhang | Jing Zhao |
| [HDFS-2390](https://issues.apache.org/jira/browse/HDFS-2390) | dfsadmin -setBalancerBandwidth doesnot validate -ve value |  Minor | balancer & mover | Rajit Saha | Gautam Gopalakrishnan |
| [HDFS-8865](https://issues.apache.org/jira/browse/HDFS-8865) | Improve quota initialization performance |  Major | . | Kihwal Lee | Kihwal Lee |
| [HDFS-8983](https://issues.apache.org/jira/browse/HDFS-8983) | NameNode support for protected directories |  Major | namenode | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8946](https://issues.apache.org/jira/browse/HDFS-8946) | Improve choosing datanode storage for block placement |  Major | namenode | Yi Liu | Yi Liu |
| [HDFS-8965](https://issues.apache.org/jira/browse/HDFS-8965) | Harden edit log reading code against out of memory errors |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HADOOP-12368](https://issues.apache.org/jira/browse/HADOOP-12368) | Mark ViewFileSystemBaseTest and ViewFsBaseTest as abstract |  Trivial | . | Andrew Wang | Andrew Wang |
| [HADOOP-12367](https://issues.apache.org/jira/browse/HADOOP-12367) | Move TestFileUtil's test resources to resources folder |  Minor | . | Andrew Wang | Andrew Wang |
| [HADOOP-12369](https://issues.apache.org/jira/browse/HADOOP-12369) | Point hadoop-project/pom.xml java.security.krb5.conf within target folder |  Minor | . | Andrew Wang | Andrew Wang |
| [HDFS-328](https://issues.apache.org/jira/browse/HDFS-328) | Improve fs -setrep error message for invalid replication factors |  Major | namenode | Tsz Wo Nicholas Sze | Daniel Templeton |
| [HADOOP-5323](https://issues.apache.org/jira/browse/HADOOP-5323) | Trash documentation should describe its directory structure and configurations |  Minor | documentation | Suman Sehgal | Weiwei Yang |
| [HDFS-9021](https://issues.apache.org/jira/browse/HDFS-9021) | Use a yellow elephant rather than a blue one in diagram |  Minor | . | Andrew Wang | Andrew Wang |
| [HADOOP-12358](https://issues.apache.org/jira/browse/HADOOP-12358) | Add -safely flag to rm to prompt when deleting many files |  Major | fs | Xiaoyu Yao | Xiaoyu Yao |
| [YARN-4024](https://issues.apache.org/jira/browse/YARN-4024) | YARN RM should avoid unnecessary resolving IP when NMs doing heartbeat |  Major | resourcemanager | Wangda Tan | Hong Zhiguo |
| [HADOOP-12384](https://issues.apache.org/jira/browse/HADOOP-12384) | Add "-direct" flag option for fs copy so that user can choose not to create ".\_COPYING\_" file |  Major | fs | Chen He | J.Andreina |
| [HDFS-9019](https://issues.apache.org/jira/browse/HDFS-9019) | Adding informative message to sticky bit permission denied exception |  Minor | security | Thejas M Nair | Xiaoyu Yao |
| [HDFS-8384](https://issues.apache.org/jira/browse/HDFS-8384) | Allow NN to startup if there are files having a lease but are not under construction |  Minor | namenode | Tsz Wo Nicholas Sze | Jing Zhao |
| [HDFS-8929](https://issues.apache.org/jira/browse/HDFS-8929) | Add a metric to expose the timestamp of the last journal |  Major | journal-node | Akira Ajisaka | Surendra Singh Lilhore |
| [HDFS-7116](https://issues.apache.org/jira/browse/HDFS-7116) | Add a command to get the balancer bandwidth |  Major | balancer & mover | Akira Ajisaka | Rakesh R |
| [YARN-4086](https://issues.apache.org/jira/browse/YARN-4086) | Allow Aggregated Log readers to handle HAR files |  Major | . | Robert Kanter | Robert Kanter |
| [HDFS-8974](https://issues.apache.org/jira/browse/HDFS-8974) | Convert docs in xdoc format to markdown |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-4145](https://issues.apache.org/jira/browse/YARN-4145) | Make RMHATestBase abstract so its not run when running all tests under that namespace |  Minor | . | Anubhav Dhoot | Anubhav Dhoot |
| [HADOOP-12324](https://issues.apache.org/jira/browse/HADOOP-12324) | Better exception reporting in SaslPlainServer |  Minor | security | Mike Yoder | Mike Yoder |
| [YARN-2005](https://issues.apache.org/jira/browse/YARN-2005) | Blacklisting support for scheduling AMs |  Major | resourcemanager | Jason Lowe | Anubhav Dhoot |
| [HDFS-8829](https://issues.apache.org/jira/browse/HDFS-8829) | Make SO\_RCVBUF and SO\_SNDBUF size configurable for DataTransferProtocol sockets and allow configuring auto-tuning |  Major | datanode | He Tianyi | He Tianyi |
| [HDFS-9065](https://issues.apache.org/jira/browse/HDFS-9065) | Include commas on # of files, blocks, total filesystem objects in NN Web UI |  Minor | namenode | Daniel Templeton | Daniel Templeton |
| [HADOOP-12413](https://issues.apache.org/jira/browse/HADOOP-12413) | AccessControlList should avoid calling getGroupNames in isUserInList with empty groups. |  Major | security | zhihai xu | zhihai xu |
| [HDFS-8953](https://issues.apache.org/jira/browse/HDFS-8953) | DataNode Metrics logging |  Major | . | Kanaka Kumar Avvaru | Kanaka Kumar Avvaru |
| [YARN-4158](https://issues.apache.org/jira/browse/YARN-4158) | Remove duplicate close for LogWriter in AppLogAggregatorImpl#uploadLogsForContainers |  Minor | nodemanager | zhihai xu | zhihai xu |
| [YARN-4149](https://issues.apache.org/jira/browse/YARN-4149) | yarn logs -am should provide an option to fetch all the log files |  Major | client, nodemanager | Varun Vasudev | Varun Vasudev |
| [HDFS-9082](https://issues.apache.org/jira/browse/HDFS-9082) | Change the log level in WebHdfsFileSystem.initialize() from INFO to DEBUG |  Minor | webhdfs | Santhosh G Nayak | Santhosh G Nayak |
| [YARN-4135](https://issues.apache.org/jira/browse/YARN-4135) | Improve the assertion message in MockRM while failing after waiting for the state. |  Trivial | . | nijel | nijel |
| [MAPREDUCE-6478](https://issues.apache.org/jira/browse/MAPREDUCE-6478) | Add an option to skip cleanupJob stage or ignore cleanup failure during commitJob(). |  Major | . | Junping Du | Junping Du |
| [HADOOP-12404](https://issues.apache.org/jira/browse/HADOOP-12404) | Disable caching for JarURLConnection to avoid sharing JarFile with other users when loading resource from URL in Configuration class. |  Minor | conf | zhihai xu | zhihai xu |
| [HADOOP-12428](https://issues.apache.org/jira/browse/HADOOP-12428) | Fix inconsistency between log-level guards and statements |  Minor | . | Jackie Chang | Jagadesh Kiran N |
| [YARN-4095](https://issues.apache.org/jira/browse/YARN-4095) | Avoid sharing AllocatorPerContext object in LocalDirAllocator between ShuffleHandler and LocalDirsHandlerService. |  Major | nodemanager | zhihai xu | zhihai xu |
| [HDFS-5795](https://issues.apache.org/jira/browse/HDFS-5795) | RemoteBlockReader2#checkSuccess() shoud print error status |  Trivial | . | Brandon Li | Xiao Chen |
| [HDFS-9112](https://issues.apache.org/jira/browse/HDFS-9112) | Improve error message for Haadmin when multiple name service IDs are configured |  Major | tools | Anu Engineer | Anu Engineer |
| [HDFS-9132](https://issues.apache.org/jira/browse/HDFS-9132) | Pass genstamp to ReplicaAccessorBuilder |  Major | hdfs-client | Colin P. McCabe | Colin P. McCabe |
| [HDFS-8873](https://issues.apache.org/jira/browse/HDFS-8873) | Allow the directoryScanner to be rate-limited |  Major | datanode | Nathan Roberts | Daniel Templeton |
| [HADOOP-12442](https://issues.apache.org/jira/browse/HADOOP-12442) | Display help if the  command option to "hdfs dfs " is not valid |  Minor | . | nijel | nijel |
| [HADOOP-11984](https://issues.apache.org/jira/browse/HADOOP-11984) | Enable parallel JUnit tests in pre-commit. |  Major | build, scripts, test | Chris Nauroth | Chris Nauroth |
| [MAPREDUCE-6471](https://issues.apache.org/jira/browse/MAPREDUCE-6471) | Document distcp incremental copy |  Major | distcp | Arpit Agarwal | Neelesh Srinivas Salian |
| [HDFS-9148](https://issues.apache.org/jira/browse/HDFS-9148) | Incorrect assert message in TestWriteToReplica#testWriteToTemporary |  Trivial | test | Tony Wu | Tony Wu |
| [HDFS-8859](https://issues.apache.org/jira/browse/HDFS-8859) | Improve DataNode ReplicaMap memory footprint to save about 45% |  Major | datanode | Yi Liu | Yi Liu |
| [HDFS-8696](https://issues.apache.org/jira/browse/HDFS-8696) | Make the lower and higher watermark in the DN Netty server configurable |  Major | webhdfs | Xiaobing Zhou | Xiaobing Zhou |
| [YARN-3727](https://issues.apache.org/jira/browse/YARN-3727) | For better error recovery, check if the directory exists before using it for localization. |  Major | nodemanager | zhihai xu | zhihai xu |
| [HDFS-9175](https://issues.apache.org/jira/browse/HDFS-9175) | Change scope of 'AccessTokenProvider.getAccessToken()' and 'CredentialBasedAccessTokenProvider.getCredential()' abstract methods to public |  Major | webhdfs | Santhosh G Nayak | Santhosh G Nayak |
| [HADOOP-12458](https://issues.apache.org/jira/browse/HADOOP-12458) | Retries is typoed to spell Retires in parts of hadoop-yarn and hadoop-common |  Minor | documentation | Neelesh Srinivas Salian | Neelesh Srinivas Salian |
| [HDFS-9151](https://issues.apache.org/jira/browse/HDFS-9151) | Mover should print the exit status/reason on console like balancer tool. |  Minor | balancer & mover | Archana T | Surendra Singh Lilhore |
| [HADOOP-12350](https://issues.apache.org/jira/browse/HADOOP-12350) | WASB Logging: Improve WASB Logging around deletes, reads and writes |  Major | tools | Dushyanth | Dushyanth |
| [HADOOP-12284](https://issues.apache.org/jira/browse/HADOOP-12284) | UserGroupInformation doAs can throw misleading exception |  Trivial | security | Aaron Dossett | Aaron Dossett |
| [YARN-4228](https://issues.apache.org/jira/browse/YARN-4228) | FileSystemRMStateStore use IOUtils#close instead of fs#close |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3943](https://issues.apache.org/jira/browse/YARN-3943) | Use separate threshold configurations for disk-full detection and disk-not-full detection. |  Critical | nodemanager | zhihai xu | zhihai xu |
| [MAPREDUCE-6479](https://issues.apache.org/jira/browse/MAPREDUCE-6479) | Add missing mapred job command options in mapreduce document |  Major | documentation | nijel | nijel |
| [HADOOP-11104](https://issues.apache.org/jira/browse/HADOOP-11104) | org.apache.hadoop.metrics2.lib.MetricsRegistry needs numerical parameter checking |  Minor | . | Ray Chiang | Ray Chiang |
| [HDFS-9181](https://issues.apache.org/jira/browse/HDFS-9181) | Better handling of exceptions thrown during upgrade shutdown |  Minor | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9110](https://issues.apache.org/jira/browse/HDFS-9110) | Use Files.walkFileTree in NNUpgradeUtil#doPreUpgrade for better efficiency |  Minor | . | Charlie Helin | Charlie Helin |
| [HDFS-9221](https://issues.apache.org/jira/browse/HDFS-9221) | HdfsServerConstants#ReplicaState#getState should avoid calling values() since it creates a temporary array |  Major | performance | Staffan Friberg | Staffan Friberg |
| [HDFS-8988](https://issues.apache.org/jira/browse/HDFS-8988) | Use LightWeightHashSet instead of LightWeightLinkedSet in BlockManager#excessReplicateMap |  Major | . | Yi Liu | Yi Liu |
| [HDFS-9139](https://issues.apache.org/jira/browse/HDFS-9139) | Enable parallel JUnit tests for HDFS Pre-commit |  Major | test | Vinayakumar B | Vinayakumar B |
| [HDFS-9145](https://issues.apache.org/jira/browse/HDFS-9145) | Tracking methods that hold FSNamesytemLock for too long |  Major | namenode | Jing Zhao | Mingliang Liu |
| [HADOOP-10775](https://issues.apache.org/jira/browse/HADOOP-10775) | Shell operations to fail with meaningful errors on windows if winutils.exe not found |  Minor | util | Steve Loughran | Steve Loughran |
| [YARN-4253](https://issues.apache.org/jira/browse/YARN-4253) | Standardize on using PrivilegedOperationExecutor for all invocations of container-executor in LinuxContainerExecutor |  Major | . | Sidharta Seethana | Sidharta Seethana |
| [YARN-4252](https://issues.apache.org/jira/browse/YARN-4252) | Log container-executor invocation details when exit code is non-zero |  Minor | nodemanager | Sidharta Seethana | Sidharta Seethana |
| [HDFS-9238](https://issues.apache.org/jira/browse/HDFS-9238) | Update TestFileCreation#testLeaseExpireHardLimit() to avoid using DataNodeTestUtils#getFile() |  Trivial | test | Tony Wu | Tony Wu |
| [HDFS-9188](https://issues.apache.org/jira/browse/HDFS-9188) | Make block corruption related tests FsDataset-agnostic. |  Major | test | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HDFS-9205](https://issues.apache.org/jira/browse/HDFS-9205) | Do not schedule corrupt blocks for replication |  Minor | namenode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HADOOP-12481](https://issues.apache.org/jira/browse/HADOOP-12481) | JWTRedirectAuthenticationHandler doesn't Retain Original Query String |  Major | security | Larry McCay | Larry McCay |
| [HDFS-9257](https://issues.apache.org/jira/browse/HDFS-9257) | improve error message for "Absolute path required" in INode.java to contain the rejected path |  Trivial | namenode | Marcell Szabo | Marcell Szabo |
| [HDFS-9253](https://issues.apache.org/jira/browse/HDFS-9253) | Refactor tests of libhdfs into a directory |  Major | . | Haohui Mai | Haohui Mai |
| [HADOOP-12450](https://issues.apache.org/jira/browse/HADOOP-12450) | UserGroupInformation should not log at WARN level if no groups are found |  Minor | security | Elliott Clark | Elliott Clark |
| [HADOOP-12460](https://issues.apache.org/jira/browse/HADOOP-12460) | Add overwrite option for 'get' shell command |  Major | . | Keegan Witt | Jagadesh Kiran N |
| [HDFS-9250](https://issues.apache.org/jira/browse/HDFS-9250) | Add Precondition check to LocatedBlock#addCachedLoc |  Major | namenode | Xiao Chen | Xiao Chen |
| [HDFS-9251](https://issues.apache.org/jira/browse/HDFS-9251) | Refactor TestWriteToReplica and TestFsDatasetImpl to avoid explicitly creating Files in tests code. |  Major | test | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [MAPREDUCE-6489](https://issues.apache.org/jira/browse/MAPREDUCE-6489) | Fail fast rogue tasks that write too much to local disk |  Major | task | Maysam Yabandeh | Maysam Yabandeh |
| [HDFS-8647](https://issues.apache.org/jira/browse/HDFS-8647) | Abstract BlockManager's rack policy into BlockPlacementPolicy |  Major | . | Ming Ma | Brahma Reddy Battula |
| [HDFS-7087](https://issues.apache.org/jira/browse/HDFS-7087) | Ability to list /.reserved |  Major | . | Andrew Wang | Xiao Chen |
| [HDFS-9280](https://issues.apache.org/jira/browse/HDFS-9280) | Document NFS gateway export point parameter |  Trivial | documentation | Zhe Zhang | Xiao Chen |
| [HADOOP-12334](https://issues.apache.org/jira/browse/HADOOP-12334) | Change Mode Of Copy Operation of HBase WAL Archiving to bypass Azure Storage Throttling after retries |  Major | tools | Gaurav Kanade | Gaurav Kanade |
| [HADOOP-7266](https://issues.apache.org/jira/browse/HADOOP-7266) | Deprecate metrics v1 |  Blocker | metrics | Luke Lu | Akira Ajisaka |
| [YARN-2913](https://issues.apache.org/jira/browse/YARN-2913) | Fair scheduler should have ability to set MaxResourceDefault for each queue |  Major | . | Siqi Li | Siqi Li |
| [HDFS-9264](https://issues.apache.org/jira/browse/HDFS-9264) | Minor cleanup of operations on FsVolumeList#volumes |  Minor | . | Walter Su | Walter Su |
| [HDFS-8808](https://issues.apache.org/jira/browse/HDFS-8808) | dfs.image.transfer.bandwidthPerSec should not apply to -bootstrapStandby |  Major | . | Gautam Gopalakrishnan | Zhe Zhang |
| [HDFS-9297](https://issues.apache.org/jira/browse/HDFS-9297) | Update TestBlockMissingException to use corruptBlockOnDataNodesByDeletingBlockFile() |  Trivial | test | Tony Wu | Tony Wu |
| [HDFS-4015](https://issues.apache.org/jira/browse/HDFS-4015) | Safemode should count and report orphaned blocks |  Major | namenode | Todd Lipcon | Anu Engineer |
| [YARN-3528](https://issues.apache.org/jira/browse/YARN-3528) | Tests with 12345 as hard-coded port break jenkins |  Blocker | . | Steve Loughran | Brahma Reddy Battula |
| [YARN-4285](https://issues.apache.org/jira/browse/YARN-4285) | Display resource usage as percentage of queue and cluster in the RM UI |  Major | resourcemanager | Varun Vasudev | Varun Vasudev |
| [HDFS-7284](https://issues.apache.org/jira/browse/HDFS-7284) | Add more debug info to BlockInfoUnderConstruction#setGenerationStampAndVerifyReplicas |  Major | namenode | Hu Liu, | Wei-Chiu Chuang |
| [HADOOP-12472](https://issues.apache.org/jira/browse/HADOOP-12472) | Make GenericTestUtils.assertExceptionContains robust |  Minor | test | Steve Loughran | Steve Loughran |
| [HDFS-9291](https://issues.apache.org/jira/browse/HDFS-9291) | Fix TestInterDatanodeProtocol to be FsDataset-agnostic. |  Minor | test | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HDFS-8945](https://issues.apache.org/jira/browse/HDFS-8945) | Update the description about replica placement in HDFS Architecture documentation |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-9292](https://issues.apache.org/jira/browse/HDFS-9292) | Make TestFileConcorruption independent to underlying FsDataset Implementation. |  Minor | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HDFS-9259](https://issues.apache.org/jira/browse/HDFS-9259) | Make SO\_SNDBUF size configurable at DFSClient side for hdfs write scenario |  Major | . | Ming Ma | Mingliang Liu |
| [HDFS-9299](https://issues.apache.org/jira/browse/HDFS-9299) | Give ReplicationMonitor a readable thread name |  Trivial | namenode | Staffan Friberg | Staffan Friberg |
| [HDFS-9307](https://issues.apache.org/jira/browse/HDFS-9307) | fuseConnect should be private to fuse\_connect.c |  Trivial | fuse-dfs | Colin P. McCabe | Mingliang Liu |
| [HADOOP-12520](https://issues.apache.org/jira/browse/HADOOP-12520) | Use XInclude in hadoop-azure test configuration to isolate Azure Storage account keys for service integration tests. |  Major | fs/azure, test | Chris Nauroth | Chris Nauroth |
| [HDFS-9311](https://issues.apache.org/jira/browse/HDFS-9311) | Support optional offload of NameNode HA service health checks to a separate RPC server. |  Major | ha, namenode | Chris Nauroth | Chris Nauroth |
| [HDFS-9255](https://issues.apache.org/jira/browse/HDFS-9255) | Consolidate block recovery related implementation into a single class |  Minor | datanode | Walter Su | Walter Su |
| [YARN-2573](https://issues.apache.org/jira/browse/YARN-2573) | Integrate ReservationSystem with the RM failover mechanism |  Major | capacityscheduler, fairscheduler, resourcemanager | Subru Krishnan | Subru Krishnan |
| [HDFS-6200](https://issues.apache.org/jira/browse/HDFS-6200) | Create a separate jar for hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [HDFS-8545](https://issues.apache.org/jira/browse/HDFS-8545) | Refactor FS#getUsed() to use ContentSummary and add an API to fetch the total file length from a specific path |  Minor | . | J.Andreina | J.Andreina |
| [HDFS-9229](https://issues.apache.org/jira/browse/HDFS-9229) | Expose size of NameNode directory as a metric |  Minor | namenode | Zhe Zhang | Surendra Singh Lilhore |
| [YARN-4310](https://issues.apache.org/jira/browse/YARN-4310) | FairScheduler: Log skipping reservation messages at DEBUG level |  Minor | fairscheduler | Arun Suresh | Arun Suresh |
| [HDFS-9312](https://issues.apache.org/jira/browse/HDFS-9312) | Fix TestReplication to be FsDataset-agnostic. |  Minor | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HDFS-9308](https://issues.apache.org/jira/browse/HDFS-9308) | Add truncateMeta() and deleteMeta() to MiniDFSCluster |  Minor | test | Tony Wu | Tony Wu |
| [HDFS-9331](https://issues.apache.org/jira/browse/HDFS-9331) | Modify TestNameNodeMXBean#testNameNodeMXBeanInfo() to account for filesystem entirely allocated for DFS use |  Trivial | test | Tony Wu | Tony Wu |
| [HDFS-9363](https://issues.apache.org/jira/browse/HDFS-9363) | Add fetchReplica() to FsDatasetTestUtils to return FsDataset-agnostic Replica. |  Minor | test | Tony Wu | Tony Wu |
| [HDFS-9282](https://issues.apache.org/jira/browse/HDFS-9282) | Make data directory count and storage raw capacity related tests FsDataset-agnostic |  Minor | test | Tony Wu | Tony Wu |
| [HADOOP-12344](https://issues.apache.org/jira/browse/HADOOP-12344) | Improve validateSocketPathSecurity0 error message |  Trivial | net | Casey Brotherton | Casey Brotherton |
| [HDFS-9398](https://issues.apache.org/jira/browse/HDFS-9398) | Make ByteArraryManager log message in one-line format |  Minor | hdfs-client | Mingliang Liu | Mingliang Liu |
| [HDFS-9234](https://issues.apache.org/jira/browse/HDFS-9234) | WebHdfs : getContentSummary() should give quota for storage types |  Major | webhdfs | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-9369](https://issues.apache.org/jira/browse/HDFS-9369) | Use ctest to run tests for hadoop-hdfs-native-client |  Minor | . | Haohui Mai | Haohui Mai |
| [HADOOP-12562](https://issues.apache.org/jira/browse/HADOOP-12562) | Make hadoop dockerfile usable by Yetus |  Major | build | Allen Wittenauer | Allen Wittenauer |
| [YARN-4287](https://issues.apache.org/jira/browse/YARN-4287) | Capacity Scheduler: Rack Locality improvement |  Major | capacityscheduler | Nathan Roberts | Nathan Roberts |
| [MAPREDUCE-5485](https://issues.apache.org/jira/browse/MAPREDUCE-5485) | Allow repeating job commit by extending OutputCommitter API |  Critical | . | Nemon Lou | Junping Du |
| [MAPREDUCE-6499](https://issues.apache.org/jira/browse/MAPREDUCE-6499) | Add elapsed time for retired job in JobHistoryServer WebUI |  Major | webapps | Yiqun Lin | Yiqun Lin |
| [HDFS-9252](https://issues.apache.org/jira/browse/HDFS-9252) | Change TestFileTruncate to use FsDatasetTestUtils to get block file size and genstamp. |  Major | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HADOOP-12568](https://issues.apache.org/jira/browse/HADOOP-12568) | Update core-default.xml to describe posixGroups support |  Minor | documentation | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4279](https://issues.apache.org/jira/browse/YARN-4279) | Mark ApplicationId and ApplicationAttemptId static methods as @Public, @Unstable |  Minor | client | Steve Loughran | Steve Loughran |
| [HADOOP-12575](https://issues.apache.org/jira/browse/HADOOP-12575) | Add build instruction for docker toolbox instead of boot2docker |  Trivial | documentation | Kai Sasaki | Kai Sasaki |
| [HDFS-8056](https://issues.apache.org/jira/browse/HDFS-8056) | Decommissioned dead nodes should continue to be counted as dead after NN restart |  Major | . | Ming Ma | Ming Ma |
| [HADOOP-11901](https://issues.apache.org/jira/browse/HADOOP-11901) | BytesWritable fails to support 2G chunks due to integer overflow |  Major | . | Reynold Xin | Reynold Xin |
| [HDFS-9439](https://issues.apache.org/jira/browse/HDFS-9439) | Include status of closeAck into exception message in DataNode#run |  Trivial | . | Xiao Chen | Xiao Chen |
| [HDFS-9402](https://issues.apache.org/jira/browse/HDFS-9402) | Switch DataNode.LOG to use slf4j |  Minor | . | Walter Su | Walter Su |
| [HDFS-3302](https://issues.apache.org/jira/browse/HDFS-3302) | Review and improve HDFS trash documentation |  Major | documentation | Harsh J |  |
| [HADOOP-10035](https://issues.apache.org/jira/browse/HADOOP-10035) | Cleanup TestFilterFileSystem |  Major | . | Suresh Srinivas | Suresh Srinivas |
| [HADOOP-10555](https://issues.apache.org/jira/browse/HADOOP-10555) | Add offset support to MurmurHash |  Trivial | . | Sergey Shelukhin | Sergey Shelukhin |
| [HADOOP-10068](https://issues.apache.org/jira/browse/HADOOP-10068) | Improve log4j regex in testFindContainingJar |  Trivial | . | Robert Rati | Robert Rati |
| [HDFS-9024](https://issues.apache.org/jira/browse/HDFS-9024) | Deprecate the TotalFiles metric |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-7988](https://issues.apache.org/jira/browse/HDFS-7988) | Replace usage of ExactSizeInputStream with LimitInputStream. |  Minor | . | Chris Nauroth | Walter Su |
| [HDFS-9314](https://issues.apache.org/jira/browse/HDFS-9314) | Improve BlockPlacementPolicyDefault's picking of excess replicas |  Major | . | Ming Ma | Xiao Chen |
| [MAPREDUCE-5870](https://issues.apache.org/jira/browse/MAPREDUCE-5870) | Support for passing Job priority through Application Submission Context in Mapreduce Side |  Major | client | Sunil G | Sunil G |
| [HDFS-9434](https://issues.apache.org/jira/browse/HDFS-9434) | Recommission a datanode with 500k blocks may pause NN for 30 seconds |  Major | namenode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [YARN-4132](https://issues.apache.org/jira/browse/YARN-4132) | Separate configs for nodemanager to resourcemanager connection timeout and retries |  Major | nodemanager | Chang Li | Chang Li |
| [HDFS-8512](https://issues.apache.org/jira/browse/HDFS-8512) | WebHDFS : GETFILESTATUS should return LocatedBlock with storage type info |  Major | webhdfs | Sumana Sathish | Xiaoyu Yao |
| [HADOOP-12600](https://issues.apache.org/jira/browse/HADOOP-12600) | FileContext and AbstractFileSystem should be annotated as a Stable interface. |  Blocker | fs | Chris Nauroth | Chris Nauroth |
| [HDFS-9269](https://issues.apache.org/jira/browse/HDFS-9269) | Update the documentation and wrapper for fuse-dfs |  Minor | fuse-dfs | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9485](https://issues.apache.org/jira/browse/HDFS-9485) | Make BlockManager#removeFromExcessReplicateMap accept BlockInfo instead of Block |  Minor | namenode | Mingliang Liu | Mingliang Liu |
| [HDFS-9490](https://issues.apache.org/jira/browse/HDFS-9490) | MiniDFSCluster should change block generation stamp via FsDatasetTestUtils |  Minor | test | Tony Wu | Tony Wu |
| [HDFS-8831](https://issues.apache.org/jira/browse/HDFS-8831) | Trash Support for deletion in HDFS encryption zone |  Major | encryption | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-9474](https://issues.apache.org/jira/browse/HDFS-9474) | TestPipelinesFailover should not fail when printing debug message |  Major | . | Yongjun Zhang | John Zhuge |
| [YARN-3456](https://issues.apache.org/jira/browse/YARN-3456) | Improve handling of incomplete TimelineEntities |  Minor | timelineserver | Steve Loughran | Varun Saxena |
| [HDFS-9527](https://issues.apache.org/jira/browse/HDFS-9527) | The return type of FSNamesystem.getBlockCollection should be changed to INodeFile |  Minor | namenode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-9472](https://issues.apache.org/jira/browse/HDFS-9472) | concat() API does not give proper exception messages on ./reserved relative path |  Major | namenode | Rakesh R | Rakesh R |
| [HDFS-9532](https://issues.apache.org/jira/browse/HDFS-9532) | Detailed exception info is lost in reportTo method of ErrorReportAction and ReportBadBlockAction |  Trivial | datanode | Yongjun Zhang | Yongjun Zhang |
| [HDFS-9528](https://issues.apache.org/jira/browse/HDFS-9528) | Cleanup namenode audit/log/exception messages |  Minor | namenode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8860](https://issues.apache.org/jira/browse/HDFS-8860) | Remove unused Replica copyOnWrite code |  Major | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [MAPREDUCE-6436](https://issues.apache.org/jira/browse/MAPREDUCE-6436) | JobHistory cache issue |  Blocker | . | Ryu Kobayashi | Kai Sasaki |
| [HADOOP-12639](https://issues.apache.org/jira/browse/HADOOP-12639) | Imrpove JavaDoc for getTrimmedStrings |  Trivial | util | BELUGA BEHR | BELUGA BEHR |
| [HDFS-9557](https://issues.apache.org/jira/browse/HDFS-9557) | Reduce object allocation in PB conversion |  Major | hdfs-client | Daryn Sharp | Daryn Sharp |
| [YARN-4207](https://issues.apache.org/jira/browse/YARN-4207) | Add a non-judgemental YARN app completion status |  Major | . | Sergey Shelukhin | Rich Haase |
| [HDFS-9198](https://issues.apache.org/jira/browse/HDFS-9198) | Coalesce IBR processing in the NN |  Major | namenode | Daryn Sharp | Daryn Sharp |
| [HDFS-9552](https://issues.apache.org/jira/browse/HDFS-9552) | Document types of permission checks performed for HDFS operations. |  Major | documentation | Chris Nauroth | Chris Nauroth |
| [HADOOP-12570](https://issues.apache.org/jira/browse/HADOOP-12570) | HDFS Secure Mode Documentation updates |  Major | documentation | Arpit Agarwal | Arpit Agarwal |
| [YARN-4480](https://issues.apache.org/jira/browse/YARN-4480) | Clean up some inappropriate imports |  Major | . | Kai Zheng | Kai Zheng |
| [YARN-4290](https://issues.apache.org/jira/browse/YARN-4290) | Add -showDetails option to YARN Nodes CLI to print all nodes reports information |  Major | client | Wangda Tan | Sunil G |
| [YARN-4400](https://issues.apache.org/jira/browse/YARN-4400) | AsyncDispatcher.waitForDrained should be final |  Trivial | yarn | Daniel Templeton | Daniel Templeton |
| [MAPREDUCE-6584](https://issues.apache.org/jira/browse/MAPREDUCE-6584) | Remove trailing whitespaces from mapred-default.xml |  Major | documentation | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-12686](https://issues.apache.org/jira/browse/HADOOP-12686) | Update FileSystemShell documentation to mention the meaning of each columns of fs -du |  Minor | documentation, fs | Daisuke Kobayashi | Daisuke Kobayashi |
| [YARN-4544](https://issues.apache.org/jira/browse/YARN-4544) | All the log messages about rolling monitoring interval are shown with WARN level |  Minor | log-aggregation, nodemanager | Takashi Ohnishi | Takashi Ohnishi |
| [YARN-4438](https://issues.apache.org/jira/browse/YARN-4438) | Implement RM leader election with curator |  Major | . | Jian He | Jian He |
| [HDFS-9630](https://issues.apache.org/jira/browse/HDFS-9630) | DistCp minor refactoring and clean up |  Minor | distcp | Kai Zheng | Kai Zheng |
| [YARN-4582](https://issues.apache.org/jira/browse/YARN-4582) | Label-related invalid resource request exception should be able to properly handled by application |  Major | scheduler | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-9569](https://issues.apache.org/jira/browse/HDFS-9569) | Log the name of the fsimage being loaded for better supportability |  Trivial | namenode | Yongjun Zhang | Yongjun Zhang |
| [MAPREDUCE-6473](https://issues.apache.org/jira/browse/MAPREDUCE-6473) | Job submission can take a long time during Cluster initialization |  Major | performance | Kuhu Shukla | Kuhu Shukla |
| [HDFS-9415](https://issues.apache.org/jira/browse/HDFS-9415) | Document dfs.cluster.administrators and dfs.permissions.superusergroup |  Major | documentation | Arpit Agarwal | Xiaobing Zhou |
| [HDFS-6054](https://issues.apache.org/jira/browse/HDFS-6054) | MiniQJMHACluster should not use static port to avoid binding failure in unit test |  Major | test | Brandon Li | Yongjun Zhang |
| [YARN-4492](https://issues.apache.org/jira/browse/YARN-4492) | Add documentation for preemption supported in Capacity scheduler |  Minor | capacity scheduler | Naganarasimha G R | Naganarasimha G R |
| [YARN-4371](https://issues.apache.org/jira/browse/YARN-4371) | "yarn application -kill" should take multiple application ids |  Major | . | Tsuyoshi Ozawa | Sunil G |
| [HDFS-9653](https://issues.apache.org/jira/browse/HDFS-9653) | Expose the number of blocks pending deletion through dfsadmin report command |  Major | hdfs-client, tools | Weiwei Yang | Weiwei Yang |
| [HADOOP-12731](https://issues.apache.org/jira/browse/HADOOP-12731) | Remove useless boxing/unboxing code |  Minor | performance | Kousuke Saruta | Kousuke Saruta |
| [HDFS-9654](https://issues.apache.org/jira/browse/HDFS-9654) | Code refactoring for HDFS-8578 |  Minor | datanode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-9706](https://issues.apache.org/jira/browse/HDFS-9706) | Log more details in debug logs in BlockReceiver's constructor |  Minor | . | Xiao Chen | Xiao Chen |
| [HDFS-9638](https://issues.apache.org/jira/browse/HDFS-9638) | Improve DistCp Help and documentation |  Minor | distcp | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9566](https://issues.apache.org/jira/browse/HDFS-9566) | Remove expensive 'BlocksMap#getStorages(Block b, final DatanodeStorage.State state)' method |  Major | namenode | Daryn Sharp | Daryn Sharp |
| [HDFS-9721](https://issues.apache.org/jira/browse/HDFS-9721) | Allow Delimited PB OIV tool to run upon fsimage that contains INodeReference |  Major | . | Xiao Chen | Xiao Chen |
| [HDFS-9669](https://issues.apache.org/jira/browse/HDFS-9669) | TcpPeerServer should respect ipc.server.listen.queue.size |  Major | . | Elliott Clark | Elliott Clark |
| [HDFS-9715](https://issues.apache.org/jira/browse/HDFS-9715) | Check storage ID uniqueness on datanode startup |  Major | datanode | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [YARN-4662](https://issues.apache.org/jira/browse/YARN-4662) | Document some newly added metrics |  Major | . | Jian He | Jian He |
| [HDFS-9629](https://issues.apache.org/jira/browse/HDFS-9629) | Update the footer of Web UI to show year 2016 |  Major | . | Xiao Chen | Xiao Chen |
| [MAPREDUCE-6566](https://issues.apache.org/jira/browse/MAPREDUCE-6566) | Add retry support to mapreduce CLI tool |  Major | . | Varun Vasudev | Varun Vasudev |
| [HDFS-9726](https://issues.apache.org/jira/browse/HDFS-9726) | Refactor IBR code to a new class |  Minor | datanode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HADOOP-12772](https://issues.apache.org/jira/browse/HADOOP-12772) | NetworkTopologyWithNodeGroup.getNodeGroup() can loop infinitely for invalid 'loc' values |  Minor | . | Kuhu Shukla | Kuhu Shukla |
| [HADOOP-12758](https://issues.apache.org/jira/browse/HADOOP-12758) | Extend CSRF Filter with UserAgent Checks |  Major | security | Larry McCay | Larry McCay |
| [HDFS-9686](https://issues.apache.org/jira/browse/HDFS-9686) | Remove useless boxing/unboxing code |  Minor | performance | Kousuke Saruta | Kousuke Saruta |
| [MAPREDUCE-6626](https://issues.apache.org/jira/browse/MAPREDUCE-6626) | Reuse ObjectMapper instance in MapReduce |  Minor | performance | Yiqun Lin | Yiqun Lin |
| [HADOOP-12788](https://issues.apache.org/jira/browse/HADOOP-12788) | OpensslAesCtrCryptoCodec should log which random number generator is used. |  Minor | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12764](https://issues.apache.org/jira/browse/HADOOP-12764) | Increase default value of KMS maxHttpHeaderSize and make it configurable |  Minor | . | Zhe Zhang | Zhe Zhang |
| [HADOOP-12776](https://issues.apache.org/jira/browse/HADOOP-12776) | Remove getaclstatus call for non-acl commands in getfacl. |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9768](https://issues.apache.org/jira/browse/HDFS-9768) | Reuse objectMapper instance in HDFS to improve the performance |  Major | performance | Yiqun Lin | Yiqun Lin |
| [HDFS-9644](https://issues.apache.org/jira/browse/HDFS-9644) | Update encryption documentation to reflect nested EZs |  Major | documentation, encryption | Zhe Zhang | Zhe Zhang |
| [HDFS-9700](https://issues.apache.org/jira/browse/HDFS-9700) | DFSClient and DFSOutputStream should set TCP\_NODELAY on sockets for DataTransferProtocol |  Major | hdfs-client | Gary Helmling | Gary Helmling |
| [HDFS-9797](https://issues.apache.org/jira/browse/HDFS-9797) | Log Standby exceptions thrown by RequestHedgingProxyProvider at DEBUG Level |  Minor | hdfs-client | Inigo Goiri | Inigo Goiri |
| [YARN-4682](https://issues.apache.org/jira/browse/YARN-4682) | AMRM client to log when AMRM token updated |  Major | client | Steve Loughran | Prabhu Joseph |
| [HADOOP-12805](https://issues.apache.org/jira/browse/HADOOP-12805) | Annotate CanUnbuffer with @InterfaceAudience.Public |  Major | . | Ted Yu | Ted Yu |
| [YARN-4690](https://issues.apache.org/jira/browse/YARN-4690) | Skip object allocation in FSAppAttempt#getResourceUsage when possible |  Major | . | Ming Ma | Ming Ma |
| [HADOOP-10865](https://issues.apache.org/jira/browse/HADOOP-10865) | Add a Crc32 chunked verification benchmark for both directly and non-directly buffer cases |  Minor | util | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-4946](https://issues.apache.org/jira/browse/HDFS-4946) | Allow preferLocalNode in BlockPlacementPolicyDefault to be configurable |  Major | namenode | James Kinley | Nathan Roberts |
| [HADOOP-11031](https://issues.apache.org/jira/browse/HADOOP-11031) | Design Document for Credential Provider API |  Major | site | Larry McCay | Larry McCay |
| [HADOOP-12828](https://issues.apache.org/jira/browse/HADOOP-12828) | Print user when services are started |  Trivial | . | Brandon Li | Wei-Chiu Chuang |
| [HADOOP-12794](https://issues.apache.org/jira/browse/HADOOP-12794) | Support additional compression levels for GzipCodec |  Major | io | Ravi Mutyala | Ravi Mutyala |
| [HDFS-9425](https://issues.apache.org/jira/browse/HDFS-9425) | Expose number of blocks per volume as a metric |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12668](https://issues.apache.org/jira/browse/HADOOP-12668) | Support excluding weak Ciphers in HttpServer2 through ssl-server.conf |  Critical | security | Vijay Singh | Vijay Singh |
| [HADOOP-12555](https://issues.apache.org/jira/browse/HADOOP-12555) | WASB to read credentials from a credential provider |  Minor | fs/azure | Chris Nauroth | Larry McCay |
| [HDFS-8578](https://issues.apache.org/jira/browse/HDFS-8578) | On upgrade, Datanode should process all storage/data dirs in parallel |  Critical | datanode | Raju Bairishetti | Vinayakumar B |
| [HADOOP-12535](https://issues.apache.org/jira/browse/HADOOP-12535) | Run FileSystem contract tests with hadoop-azure. |  Major | fs/azure, test | Chris Nauroth | madhumita chakraborty |
| [HDFS-9854](https://issues.apache.org/jira/browse/HDFS-9854) | Log cipher suite negotiation more verbosely |  Major | encryption | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9843](https://issues.apache.org/jira/browse/HDFS-9843) | Document distcp options required for copying between encrypted locations |  Major | distcp, documentation, encryption | Xiaoyu Yao | Xiaoyu Yao |
| [HADOOP-12824](https://issues.apache.org/jira/browse/HADOOP-12824) | Collect network and disk usage on the node running Windows |  Major | . | Inigo Goiri | Inigo Goiri |
| [YARN-4720](https://issues.apache.org/jira/browse/YARN-4720) | Skip unnecessary NN operations in log aggregation |  Major | . | Ming Ma | Jun Gong |
| [HDFS-9831](https://issues.apache.org/jira/browse/HDFS-9831) | Document webhdfs retry configuration keys introduced by HDFS-5219/HDFS-5122 |  Major | documentation, webhdfs | Xiaoyu Yao | Xiaobing Zhou |
| [HDFS-9710](https://issues.apache.org/jira/browse/HDFS-9710) | Change DN to send block receipt IBRs in batches |  Major | datanode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [MAPREDUCE-6622](https://issues.apache.org/jira/browse/MAPREDUCE-6622) | Add capability to set JHS job cache to a task-based limit |  Critical | jobhistoryserver | Ray Chiang | Ray Chiang |
| [HADOOP-12825](https://issues.apache.org/jira/browse/HADOOP-12825) | Log slow name resolutions |  Major | . | Sidharta Seethana | Sidharta Seethana |
| [YARN-4671](https://issues.apache.org/jira/browse/YARN-4671) | There is no need to acquire CS lock when completing a container |  Major | . | MENG DING | MENG DING |
| [HADOOP-12853](https://issues.apache.org/jira/browse/HADOOP-12853) | Change WASB documentation regarding page blob support |  Minor | fs/azure | madhumita chakraborty | madhumita chakraborty |
| [HDFS-9887](https://issues.apache.org/jira/browse/HDFS-9887) | WebHdfs socket timeouts should be configurable |  Major | fs, webhdfs | Austin Donnelly | Austin Donnelly |
| [HADOOP-12859](https://issues.apache.org/jira/browse/HADOOP-12859) | Disable hiding field style checks in class setters |  Major | . | Kai Zheng | Kai Zheng |
| [HDFS-9534](https://issues.apache.org/jira/browse/HDFS-9534) | Add CLI command to clear storage policy from a path. |  Major | tools | Chris Nauroth | Xiaobing Zhou |
| [HADOOP-12793](https://issues.apache.org/jira/browse/HADOOP-12793) | Write a new group mapping service guide |  Major | documentation | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12470](https://issues.apache.org/jira/browse/HADOOP-12470) | In-page TOC of documentation should be automatically generated by doxia macro |  Major | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-9889](https://issues.apache.org/jira/browse/HDFS-9889) | Update balancer/mover document about HDFS-6133 feature |  Minor | . | Yongjun Zhang | Yongjun Zhang |
| [MAPREDUCE-6648](https://issues.apache.org/jira/browse/MAPREDUCE-6648) | Add yarn.app.mapreduce.am.log.level to mapred-default.xml |  Trivial | documentation | Harsh J | Harsh J |
| [HDFS-9906](https://issues.apache.org/jira/browse/HDFS-9906) | Remove spammy log spew when a datanode is restarted |  Major | namenode | Elliott Clark | Brahma Reddy Battula |
| [HADOOP-12901](https://issues.apache.org/jira/browse/HADOOP-12901) | Add warning log when KMSClientProvider cannot create a connection to the KMS server |  Minor | . | Xiao Chen | Xiao Chen |
| [HADOOP-12789](https://issues.apache.org/jira/browse/HADOOP-12789) | log classpath of ApplicationClassLoader at INFO level |  Minor | util | Sangjin Lee | Sangjin Lee |
| [HDFS-9882](https://issues.apache.org/jira/browse/HDFS-9882) | Add heartbeatsTotal in Datanode metrics |  Minor | datanode | Hua Liu | Hua Liu |
| [HADOOP-12860](https://issues.apache.org/jira/browse/HADOOP-12860) | Expand section "Data Encryption on HTTP" in SecureMode documentation |  Minor | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4465](https://issues.apache.org/jira/browse/YARN-4465) | SchedulerUtils#validateRequest for Label check should happen only when nodelabel enabled |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [HADOOP-12904](https://issues.apache.org/jira/browse/HADOOP-12904) | Update Yetus to 0.2.0 |  Blocker | build | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-12798](https://issues.apache.org/jira/browse/HADOOP-12798) | Update changelog and release notes (2016-03-04) |  Major | documentation | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-12905](https://issues.apache.org/jira/browse/HADOOP-12905) | Clean up CHANGES.txt RAT exclusions from pom.xml files. |  Trivial | build | Chris Nauroth | Chris Nauroth |
| [HDFS-9927](https://issues.apache.org/jira/browse/HDFS-9927) | Document the new OIV ReverseXML processor |  Minor | documentation | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9942](https://issues.apache.org/jira/browse/HDFS-9942) | Add an HTrace span when refreshing the groups for a username |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9941](https://issues.apache.org/jira/browse/HDFS-9941) | Do not log StandbyException on NN, other minor logging fixes |  Major | namenode | Arpit Agarwal | Arpit Agarwal |
| [HADOOP-12923](https://issues.apache.org/jira/browse/HADOOP-12923) | Move the test code in ipc.Client to test |  Minor | ipc | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-9405](https://issues.apache.org/jira/browse/HDFS-9405) | Warmup NameNode EDEK caches in background thread |  Major | encryption, namenode | Zhe Zhang | Xiao Chen |
| [HDFS-9951](https://issues.apache.org/jira/browse/HDFS-9951) | Use string constants for XML tags in OfflineImageReconstructor |  Minor | . | Yiqun Lin | Yiqun Lin |
| [HADOOP-12947](https://issues.apache.org/jira/browse/HADOOP-12947) | Update documentation Hadoop Groups Mapping to add static group mapping, negative cache |  Minor | documentation, security | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4117](https://issues.apache.org/jira/browse/YARN-4117) | End to end unit test with mini YARN cluster for AMRMProxy Service |  Major | nodemanager, resourcemanager | Kishore Chaliparambil | Giovanni Matteo Fumarola |
| [HADOOP-10965](https://issues.apache.org/jira/browse/HADOOP-10965) | Print fully qualified path in CommandWithDestination error messages |  Minor | . | André Kelpe | John Zhuge |
| [MAPREDUCE-6663](https://issues.apache.org/jira/browse/MAPREDUCE-6663) | [NNBench] Refactor nnbench as a Tool implementation. |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12886](https://issues.apache.org/jira/browse/HADOOP-12886) | Exclude weak ciphers in SSLFactory through ssl-server.xml |  Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4884](https://issues.apache.org/jira/browse/YARN-4884) | Fix missing documentation about rmadmin command regarding node labels |  Minor | . | Kai Sasaki | Kai Sasaki |
| [HADOOP-12916](https://issues.apache.org/jira/browse/HADOOP-12916) | Allow RPC scheduler/callqueue backoff using response times |  Major | ipc | Xiaoyu Yao | Xiaoyu Yao |
| [HADOOP-12950](https://issues.apache.org/jira/browse/HADOOP-12950) | ShutdownHookManager should have a timeout for each of the Registered shutdown hook |  Major | . | Xiaoyu Yao | Xiaoyu Yao |
| [HADOOP-11661](https://issues.apache.org/jira/browse/HADOOP-11661) | Deprecate FileUtil#copyMerge |  Major | util | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-11687](https://issues.apache.org/jira/browse/HADOOP-11687) | Ignore x-\* and response headers when copying an Amazon S3 object |  Major | fs/s3 | Denis Jannot | Harsh J |
| [HADOOP-11212](https://issues.apache.org/jira/browse/HADOOP-11212) | NetUtils.wrapException to handle SocketException explicitly |  Major | util | Steve Loughran | Steve Loughran |
| [HADOOP-12672](https://issues.apache.org/jira/browse/HADOOP-12672) | RPC timeout should not override IPC ping interval |  Major | ipc | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-10235](https://issues.apache.org/jira/browse/HDFS-10235) | [NN UI] Last contact for Live Nodes should be relative time |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-8813](https://issues.apache.org/jira/browse/HADOOP-8813) | RPC Server and Client classes need InterfaceAudience and InterfaceStability annotations |  Trivial | ipc | Brandon Li | Brandon Li |
| [YARN-4756](https://issues.apache.org/jira/browse/YARN-4756) | Unnecessary wait in Node Status Updater during reboot |  Major | . | Eric Badger | Eric Badger |
| [HADOOP-12951](https://issues.apache.org/jira/browse/HADOOP-12951) | Improve documentation on KMS ACLs and delegation tokens |  Major | . | Xiao Chen | Xiao Chen |
| [HADOOP-12994](https://issues.apache.org/jira/browse/HADOOP-12994) | Specify PositionedReadable, add contract tests, fix problems |  Major | fs | Steve Loughran | Steve Loughran |
| [YARN-4630](https://issues.apache.org/jira/browse/YARN-4630) | Remove useless boxing/unboxing code |  Minor | yarn | Kousuke Saruta | Kousuke Saruta |
| [HDFS-10279](https://issues.apache.org/jira/browse/HDFS-10279) | Improve validation of the configured number of tolerated failed volumes |  Major | . | Yiqun Lin | Yiqun Lin |
| [HADOOP-12822](https://issues.apache.org/jira/browse/HADOOP-12822) | Change "Metrics intern cache overflow" log level from WARN to INFO |  Minor | metrics | Akira Ajisaka | Andras Bokor |
| [HADOOP-12969](https://issues.apache.org/jira/browse/HADOOP-12969) | Mark IPC.Client and IPC.Server as @Public, @Evolving |  Minor | ipc | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-12963](https://issues.apache.org/jira/browse/HADOOP-12963) | Allow using path style addressing for accessing the s3 endpoint |  Minor | fs/s3 | Andrew Baptist | Stephen Montgomery |
| [HDFS-10280](https://issues.apache.org/jira/browse/HDFS-10280) | Document new dfsadmin command -evictWriters |  Minor | documentation | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-10292](https://issues.apache.org/jira/browse/HDFS-10292) | Add block id when client got Unable to close file exception |  Minor | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9412](https://issues.apache.org/jira/browse/HDFS-9412) | getBlocks occupies FSLock and takes too long to complete |  Major | . | He Tianyi | He Tianyi |
| [HDFS-10302](https://issues.apache.org/jira/browse/HDFS-10302) | BlockPlacementPolicyDefault should use default replication considerload value |  Trivial | . | Yiqun Lin | Yiqun Lin |
| [HDFS-10264](https://issues.apache.org/jira/browse/HDFS-10264) | Logging improvements in FSImageFormatProtobuf.Saver |  Major | namenode | Konstantin Shvachko | Xiaobing Zhou |
| [HADOOP-12985](https://issues.apache.org/jira/browse/HADOOP-12985) | Support MetricsSource interface for DecayRpcScheduler Metrics |  Major | . | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-9894](https://issues.apache.org/jira/browse/HDFS-9894) | Add unsetStoragePolicy API to FileContext/AbstractFileSystem and derivatives |  Major | . | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-12891](https://issues.apache.org/jira/browse/HADOOP-12891) | S3AFileSystem should configure Multipart Copy threshold and chunk size |  Major | fs/s3 | Andrew Olson | Andrew Olson |
| [HADOOP-13033](https://issues.apache.org/jira/browse/HADOOP-13033) | Add missing Javadoc enries to Interns.java |  Minor | metrics | Andras Bokor | Andras Bokor |
| [HDFS-10298](https://issues.apache.org/jira/browse/HDFS-10298) | Document the usage of distcp -diff option |  Major | distcp, documentation | Akira Ajisaka | Takashi Ohnishi |
| [HADOOP-13039](https://issues.apache.org/jira/browse/HADOOP-13039) | Add documentation for configuration property ipc.maximum.data.length for controlling maximum RPC message size. |  Major | documentation | Chris Nauroth | Mingliang Liu |
| [HDFS-10330](https://issues.apache.org/jira/browse/HDFS-10330) | Add Corrupt Blocks Information in Metasave Output |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [HADOOP-5470](https://issues.apache.org/jira/browse/HADOOP-5470) | RunJar.unJar() should write the last modified time found in the jar entry to the uncompressed file |  Minor | util | Colin Evans | Andras Bokor |
| [HDFS-3702](https://issues.apache.org/jira/browse/HDFS-3702) | Add an option for NOT writing the blocks locally if there is a datanode on the same box as the client |  Minor | hdfs-client | Nicolas Liochon | Lei (Eddy) Xu |
| [HDFS-10297](https://issues.apache.org/jira/browse/HDFS-10297) | Increase default balance bandwidth and concurrent moves |  Minor | balancer & mover | John Zhuge | John Zhuge |
| [HADOOP-12957](https://issues.apache.org/jira/browse/HADOOP-12957) | Limit the number of outstanding async calls |  Major | ipc | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-9902](https://issues.apache.org/jira/browse/HDFS-9902) | Support different values of dfs.datanode.du.reserved per storage type |  Major | datanode | Pan Yuxuan | Brahma Reddy Battula |
| [HADOOP-13103](https://issues.apache.org/jira/browse/HADOOP-13103) | Group resolution from LDAP may fail on javax.naming.ServiceUnavailableException |  Minor | security | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [MAPREDUCE-6678](https://issues.apache.org/jira/browse/MAPREDUCE-6678) | Allow ShuffleHandler readahead without drop-behind |  Major | nodemanager | Nathan Roberts | Nathan Roberts |
| [HADOOP-12982](https://issues.apache.org/jira/browse/HADOOP-12982) | Document missing S3A and S3 properties |  Minor | documentation, fs/s3, tools | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4995](https://issues.apache.org/jira/browse/YARN-4995) | FairScheduler: Display per-queue demand on the scheduler page |  Minor | . | xupeng | xupeng |
| [HADOOP-12868](https://issues.apache.org/jira/browse/HADOOP-12868) | Fix hadoop-openstack undeclared and unused dependencies |  Major | tools | Allen Wittenauer | Masatake Iwasaki |
| [HADOOP-12971](https://issues.apache.org/jira/browse/HADOOP-12971) | FileSystemShell doc should explain relative path |  Critical | documentation | John Zhuge | John Zhuge |
| [HADOOP-13148](https://issues.apache.org/jira/browse/HADOOP-13148) | TestDistCpViewFs to include IOExceptions in test error reports |  Minor | tools/distcp | Steve Loughran | Steve Loughran |
| [HADOOP-13146](https://issues.apache.org/jira/browse/HADOOP-13146) | Refactor RetryInvocationHandler |  Minor | io | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-10383](https://issues.apache.org/jira/browse/HDFS-10383) | Safely close resources in DFSTestUtil |  Major | test | Mingliang Liu | Mingliang Liu |
| [YARN-4002](https://issues.apache.org/jira/browse/YARN-4002) | make ResourceTrackerService.nodeHeartbeat more concurrent |  Critical | . | Hong Zhiguo | Hong Zhiguo |
| [HDFS-10417](https://issues.apache.org/jira/browse/HDFS-10417) | Improve error message from checkBlockLocalPathAccess |  Minor | datanode | Tianyin Xu | Tianyin Xu |
| [HADOOP-13168](https://issues.apache.org/jira/browse/HADOOP-13168) | Support Future.get with timeout in ipc async calls |  Major | ipc | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HADOOP-13145](https://issues.apache.org/jira/browse/HADOOP-13145) | In DistCp, prevent unnecessary getFileStatus call when not preserving metadata. |  Major | tools/distcp | Chris Nauroth | Chris Nauroth |
| [HADOOP-13198](https://issues.apache.org/jira/browse/HADOOP-13198) | Add support for OWASP's dependency-check |  Minor | build, security | Mike Yoder | Mike Yoder |
| [HDFS-10217](https://issues.apache.org/jira/browse/HDFS-10217) | show 'blockScheduled' tooltip in datanodes table. |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13199](https://issues.apache.org/jira/browse/HADOOP-13199) | Add doc for distcp -filters |  Trivial | documentation | John Zhuge | John Zhuge |
| [HADOOP-13193](https://issues.apache.org/jira/browse/HADOOP-13193) | Upgrade to Apache Yetus 0.3.0 |  Major | documentation, test | Allen Wittenauer | Kengo Seki |
| [HDFS-10341](https://issues.apache.org/jira/browse/HDFS-10341) | Add a metric to expose the timeout number of pending replication blocks |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-13105](https://issues.apache.org/jira/browse/HADOOP-13105) | Support timeouts in LDAP queries in LdapGroupsMapping. |  Major | security | Chris Nauroth | Mingliang Liu |
| [HADOOP-12807](https://issues.apache.org/jira/browse/HADOOP-12807) | S3AFileSystem should read AWS credentials from environment variables |  Minor | fs/s3 | Tobin Baker | Tobin Baker |
| [MAPREDUCE-5044](https://issues.apache.org/jira/browse/MAPREDUCE-5044) | Have AM trigger jstack on task attempts that timeout before killing them |  Major | mr-am | Jason Lowe | Eric Payne |
| [HADOOP-10048](https://issues.apache.org/jira/browse/HADOOP-10048) | LocalDirAllocator should avoid holding locks while accessing the filesystem |  Major | . | Jason Lowe | Jason Lowe |
| [MAPREDUCE-6714](https://issues.apache.org/jira/browse/MAPREDUCE-6714) | Refactor UncompressedSplitLineReader.fillBuffer() |  Major | . | Daniel Templeton | Daniel Templeton |
| [HADOOP-12943](https://issues.apache.org/jira/browse/HADOOP-12943) | Add -w -r options in dfs -test command |  Major | fs, scripts, tools | Weiwei Yang | Weiwei Yang |
| [HDFS-10493](https://issues.apache.org/jira/browse/HDFS-10493) | Add links to datanode web UI in namenode datanodes page |  Major | namenode, ui | Weiwei Yang | Weiwei Yang |
| [HADOOP-13296](https://issues.apache.org/jira/browse/HADOOP-13296) | Cleanup javadoc for Path |  Minor | documentation | Daniel Templeton | Daniel Templeton |
| [HDFS-7597](https://issues.apache.org/jira/browse/HDFS-7597) | DelegationTokenIdentifier should cache the TokenIdentifier to UGI mapping |  Critical | webhdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13307](https://issues.apache.org/jira/browse/HADOOP-13307) | add rsync to Dockerfile so that precommit archive works |  Trivial | build | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-13067](https://issues.apache.org/jira/browse/HADOOP-13067) | cleanup the dockerfile |  Major | . | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-13227](https://issues.apache.org/jira/browse/HADOOP-13227) | AsyncCallHandler should use an event driven architecture to handle async calls |  Major | io, ipc | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HADOOP-13263](https://issues.apache.org/jira/browse/HADOOP-13263) | Reload cached groups in background after expiry |  Major | . | Stephen O'Donnell | Stephen O'Donnell |
| [HDFS-10440](https://issues.apache.org/jira/browse/HDFS-10440) | Improve DataNode web UI |  Major | datanode, ui | Weiwei Yang | Weiwei Yang |
| [HADOOP-13239](https://issues.apache.org/jira/browse/HADOOP-13239) | Deprecate s3:// in branch-2 |  Major | fs/s3 | Mingliang Liu | Mingliang Liu |
| [HDFS-10582](https://issues.apache.org/jira/browse/HDFS-10582) | Change deprecated configuration fs.checkpoint.dir to dfs.namenode.checkpoint.dir in HDFS Commands Doc |  Minor | documentation | Pan Yuxuan | Pan Yuxuan |
| [HDFS-10488](https://issues.apache.org/jira/browse/HDFS-10488) | Update WebHDFS documentation regarding CREATE and MKDIR default permissions |  Minor | documentation, webhdfs | Wellington Chevreuil | Wellington Chevreuil |
| [HDFS-10300](https://issues.apache.org/jira/browse/HDFS-10300) | TestDistCpSystem should share MiniDFSCluster |  Trivial | test | John Zhuge | John Zhuge |
| [HADOOP-13290](https://issues.apache.org/jira/browse/HADOOP-13290) | Appropriate use of generics in FairCallQueue |  Major | ipc | Konstantin Shvachko | Jonathan Hung |
| [HADOOP-13289](https://issues.apache.org/jira/browse/HADOOP-13289) | Remove unused variables in TestFairCallQueue |  Minor | test | Konstantin Shvachko | Ye Zhou |
| [HDFS-10628](https://issues.apache.org/jira/browse/HDFS-10628) | Log HDFS Balancer exit message to its own log |  Minor | balancer & mover | Jiayi Zhou | Jiayi Zhou |
| [HADOOP-13298](https://issues.apache.org/jira/browse/HADOOP-13298) | Fix the leftover L&N files in hadoop-build-tools/src/main/resources/META-INF/ |  Minor | . | Xiao Chen | Tsuyoshi Ozawa |
| [YARN-4883](https://issues.apache.org/jira/browse/YARN-4883) | Make consistent operation name in AdminService |  Minor | resourcemanager | Kai Sasaki | Kai Sasaki |
| [YARN-1126](https://issues.apache.org/jira/browse/YARN-1126) | Add validation of users input nodes-states options to nodes CLI |  Major | . | Wei Yan | Wei Yan |
| [HDFS-10287](https://issues.apache.org/jira/browse/HDFS-10287) | MiniDFSCluster should implement AutoCloseable |  Minor | test | John Zhuge | Andras Bokor |
| [HDFS-10225](https://issues.apache.org/jira/browse/HDFS-10225) | DataNode hot swap drives should disallow storage type changes. |  Major | datanode | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HDFS-10660](https://issues.apache.org/jira/browse/HDFS-10660) | Expose storage policy apis via HDFSAdmin interface |  Major | . | Rakesh R | Rakesh R |
| [HDFS-9937](https://issues.apache.org/jira/browse/HDFS-9937) | Update dfsadmin command line help and HdfsQuotaAdminGuide |  Minor | . | Wei-Chiu Chuang | Kai Sasaki |
| [HDFS-10667](https://issues.apache.org/jira/browse/HDFS-10667) | Report more accurate info about data corruption location |  Major | datanode, hdfs | Yongjun Zhang | Yuanbo Liu |
| [HDFS-10676](https://issues.apache.org/jira/browse/HDFS-10676) | Add namenode metric to measure time spent in generating EDEKs |  Major | namenode | Hanisha Koneru | Hanisha Koneru |
| [MAPREDUCE-6746](https://issues.apache.org/jira/browse/MAPREDUCE-6746) | Replace org.apache.commons.io.Charsets with java.nio.charset.StandardCharsets |  Minor | . | Vincent Poon | Vincent Poon |
| [HDFS-10703](https://issues.apache.org/jira/browse/HDFS-10703) | HA NameNode Web UI should show last checkpoint time |  Minor | ui | John Zhuge | John Zhuge |
| [MAPREDUCE-6729](https://issues.apache.org/jira/browse/MAPREDUCE-6729) | Accurately compute the test execute time in DFSIO |  Minor | benchmarks, performance, test | mingleizhang | mingleizhang |
| [HADOOP-13444](https://issues.apache.org/jira/browse/HADOOP-13444) | Replace org.apache.commons.io.Charsets with java.nio.charset.StandardCharsets |  Minor | . | Vincent Poon | Vincent Poon |
| [YARN-5456](https://issues.apache.org/jira/browse/YARN-5456) | container-executor support for FreeBSD, NetBSD, and others if conf path is absolute |  Major | nodemanager, security | Allen Wittenauer | Allen Wittenauer |
| [MAPREDUCE-6730](https://issues.apache.org/jira/browse/MAPREDUCE-6730) | Use StandardCharsets instead of String overload in TextOutputFormat |  Minor | . | Sahil Kang | Sahil Kang |
| [HDFS-10707](https://issues.apache.org/jira/browse/HDFS-10707) | Replace org.apache.commons.io.Charsets with java.nio.charset.StandardCharsets |  Minor | . | Vincent Poon | Vincent Poon |
| [HADOOP-13442](https://issues.apache.org/jira/browse/HADOOP-13442) | Optimize UGI group lookups |  Major | . | Daryn Sharp | Daryn Sharp |
| [HADOOP-13466](https://issues.apache.org/jira/browse/HADOOP-13466) | Add an AutoCloseableLock class |  Major | . | Chen Liang | Chen Liang |
| [YARN-5483](https://issues.apache.org/jira/browse/YARN-5483) | Optimize RMAppAttempt#pullJustFinishedContainers |  Major | . | sandflee | sandflee |
| [HADOOP-13190](https://issues.apache.org/jira/browse/HADOOP-13190) | Mention LoadBalancingKMSClientProvider in KMS HA documentation |  Major | documentation, kms | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-10677](https://issues.apache.org/jira/browse/HDFS-10677) | Über-jira: Enhancements to NNThroughputBenchmark tool |  Major | benchmarks, tools | Mingliang Liu | Mingliang Liu |
| [HDFS-10342](https://issues.apache.org/jira/browse/HDFS-10342) | BlockManager#createLocatedBlocks should not check corrupt replicas if none are corrupt |  Major | hdfs | Daryn Sharp | Kuhu Shukla |
| [HDFS-10682](https://issues.apache.org/jira/browse/HDFS-10682) | Replace FsDatasetImpl object lock with a separate lock object |  Major | datanode | Chen Liang | Chen Liang |
| [HADOOP-13503](https://issues.apache.org/jira/browse/HADOOP-13503) | Improve SaslRpcClient failure logging |  Major | security | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-13527](https://issues.apache.org/jira/browse/HADOOP-13527) | Add Spark to CallerContext LimitedPrivate scope |  Minor | ipc | Weiqing Yang | Weiqing Yang |
| [MAPREDUCE-6587](https://issues.apache.org/jira/browse/MAPREDUCE-6587) | Remove unused params in connection-related methods of Fetcher |  Minor | . | Yiqun Lin | Yiqun Lin |
| [HADOOP-13538](https://issues.apache.org/jira/browse/HADOOP-13538) | Deprecate getInstance and initialize methods with Path in TrashPolicy |  Minor | . | Yiqun Lin | Yiqun Lin |
| [HDFS-8986](https://issues.apache.org/jira/browse/HDFS-8986) | Add option to -du to calculate directory space usage excluding snapshots |  Major | snapshots | Gautam Gopalakrishnan | Xiao Chen |
| [HDFS-10798](https://issues.apache.org/jira/browse/HDFS-10798) | Make the threshold of reporting FSNamesystem lock contention configurable |  Major | logging, namenode | Zhe Zhang | Erik Krogen |
| [YARN-5550](https://issues.apache.org/jira/browse/YARN-5550) | TestYarnCLI#testGetContainers should format according to CONTAINER\_PATTERN |  Minor | client, test | Jonathan Hung | Jonathan Hung |
| [HDFS-10814](https://issues.apache.org/jira/browse/HDFS-10814) | Add assertion for getNumEncryptionZones when no EZ is created |  Minor | test | Vinitha Reddy Gankidi | Vinitha Reddy Gankidi |
| [HDFS-10817](https://issues.apache.org/jira/browse/HDFS-10817) | Add Logging for Long-held NN Read Locks |  Major | logging, namenode | Erik Krogen | Erik Krogen |
| [HADOOP-13465](https://issues.apache.org/jira/browse/HADOOP-13465) | Design Server.Call to be extensible for unified call queue |  Major | ipc | Daryn Sharp | Daryn Sharp |
| [HDFS-10833](https://issues.apache.org/jira/browse/HDFS-10833) | Fix JSON errors in WebHDFS.md examples |  Trivial | documentation | Andrew Wang | Andrew Wang |
| [HDFS-10742](https://issues.apache.org/jira/browse/HDFS-10742) | Measure lock time in FsDatasetImpl |  Major | datanode | Chen Liang | Chen Liang |
| [HDFS-10831](https://issues.apache.org/jira/browse/HDFS-10831) | Add log when URLConnectionFactory.openConnection failed |  Minor | webhdfs | yunjiong zhao | yunjiong zhao |
| [HADOOP-13598](https://issues.apache.org/jira/browse/HADOOP-13598) | Add eol=lf for unix format files in .gitattributes |  Major | . | Akira Ajisaka | Yiqun Lin |
| [HADOOP-13580](https://issues.apache.org/jira/browse/HADOOP-13580) | If user is unauthorized, log "unauthorized" instead of "Invalid signed text:" |  Minor | security | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-10489](https://issues.apache.org/jira/browse/HDFS-10489) | Deprecate dfs.encryption.key.provider.uri for HDFS encryption zones |  Minor | . | Xiao Chen | Xiao Chen |
| [YARN-5540](https://issues.apache.org/jira/browse/YARN-5540) | scheduler spends too much time looking at empty priorities |  Major | capacity scheduler, fairscheduler, resourcemanager | Nathan Roberts | Jason Lowe |
| [HADOOP-13169](https://issues.apache.org/jira/browse/HADOOP-13169) | Randomize file list in SimpleCopyListing |  Minor | tools/distcp | Rajesh Balamohan | Rajesh Balamohan |
| [HDFS-10875](https://issues.apache.org/jira/browse/HDFS-10875) | Optimize du -x to cache intermediate result |  Major | snapshots | Xiao Chen | Xiao Chen |
| [YARN-4591](https://issues.apache.org/jira/browse/YARN-4591) | YARN Web UIs should provide a robots.txt |  Trivial | . | Lars Francke | Sidharta Seethana |
| [YARN-5622](https://issues.apache.org/jira/browse/YARN-5622) | TestYarnCLI.testGetContainers fails due to mismatched date formats |  Minor | . | Eric Badger | Eric Badger |
| [HDFS-10876](https://issues.apache.org/jira/browse/HDFS-10876) | Dispatcher#dispatch should log IOException stacktrace |  Trivial | balancer & mover | Wei-Chiu Chuang | Manoj Govindassamy |
| [YARN-3692](https://issues.apache.org/jira/browse/YARN-3692) | Allow REST API to set a user generated message when killing an application |  Major | . | Rajat Jain | Rohith Sharma K S |
| [HDFS-10869](https://issues.apache.org/jira/browse/HDFS-10869) | Remove the unused method InodeId#checkId() |  Major | namenode | Jagadesh Kiran N | Jagadesh Kiran N |
| [YARN-3877](https://issues.apache.org/jira/browse/YARN-3877) | YarnClientImpl.submitApplication swallows exceptions |  Minor | client | Steve Loughran | Varun Saxena |
| [HADOOP-13658](https://issues.apache.org/jira/browse/HADOOP-13658) | Replace config key literal strings with config key names I: hadoop common |  Minor | conf | Chen Liang | Chen Liang |
| [HADOOP-13537](https://issues.apache.org/jira/browse/HADOOP-13537) | Support external calls in the RPC call queue |  Major | ipc | Daryn Sharp | Daryn Sharp |
| [HADOOP-13317](https://issues.apache.org/jira/browse/HADOOP-13317) | Add logs to KMS server-side to improve supportability |  Minor | kms | Xiao Chen | Suraj Acharya |
| [HDFS-10940](https://issues.apache.org/jira/browse/HDFS-10940) | Reduce performance penalty of block caching when not used |  Major | namenode | Daryn Sharp | Daryn Sharp |
| [YARN-4855](https://issues.apache.org/jira/browse/YARN-4855) | Should check if node exists when replace nodelabels |  Minor | . | Tao Jie | Tao Jie |
| [HDFS-10690](https://issues.apache.org/jira/browse/HDFS-10690) | Optimize insertion/removal of replica in ShortCircuitCache |  Major | hdfs-client | Fenghua Hu | Fenghua Hu |
| [HADOOP-13685](https://issues.apache.org/jira/browse/HADOOP-13685) | Document -safely option of rm command. |  Major | . | Xiaoyu Yao | Xiaoyu Yao |
| [MAPREDUCE-6741](https://issues.apache.org/jira/browse/MAPREDUCE-6741) | add MR support to redact job conf properties |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [HDFS-10963](https://issues.apache.org/jira/browse/HDFS-10963) | Reduce log level when network topology cannot find enough datanodes. |  Minor | . | Xiao Chen | Xiao Chen |
| [HADOOP-13323](https://issues.apache.org/jira/browse/HADOOP-13323) | Downgrade stack trace on FS load from Warn to debug |  Minor | fs | Steve Loughran | Steve Loughran |
| [HADOOP-13150](https://issues.apache.org/jira/browse/HADOOP-13150) | Avoid use of toString() in output of HDFS ACL shell commands. |  Minor | . | Chris Nauroth | Chris Nauroth |
| [HADOOP-13689](https://issues.apache.org/jira/browse/HADOOP-13689) | Do not attach javadoc and sources jars during non-dist build |  Major | . | Andrew Wang | Andrew Wang |
| [HADOOP-13641](https://issues.apache.org/jira/browse/HADOOP-13641) | Update UGI#spawnAutoRenewalThreadForUserCreds to reduce indentation |  Minor | . | Xiao Chen | Huafeng Wang |
| [HDFS-10933](https://issues.apache.org/jira/browse/HDFS-10933) | Refactor TestFsck |  Minor | . | Takanobu Asanuma | Takanobu Asanuma |
| [HADOOP-13684](https://issues.apache.org/jira/browse/HADOOP-13684) | Snappy may complain Hadoop is built without snappy if libhadoop is not found. |  Minor | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-13698](https://issues.apache.org/jira/browse/HADOOP-13698) | Document caveat for KeyShell when underlying KeyProvider does not delete a key |  Minor | documentation, kms | Xiao Chen | Xiao Chen |
| [HDFS-10789](https://issues.apache.org/jira/browse/HDFS-10789) | Route webhdfs through the RPC call queue |  Major | ipc, webhdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10903](https://issues.apache.org/jira/browse/HDFS-10903) | Replace config key literal strings with config key names II: hadoop hdfs |  Minor | . | Mingliang Liu | Chen Liang |
| [HADOOP-13710](https://issues.apache.org/jira/browse/HADOOP-13710) | Supress CachingGetSpaceUsed from logging interrupted exception stacktrace |  Minor | fs | Wei-Chiu Chuang | Hanisha Koneru |
| [YARN-5599](https://issues.apache.org/jira/browse/YARN-5599) | Publish AM launch command to ATS |  Major | . | Daniel Templeton | Rohith Sharma K S |
| [HDFS-11012](https://issues.apache.org/jira/browse/HDFS-11012) | Unnecessary INFO logging on DFSClients for InvalidToken |  Minor | fs | Harsh J | Harsh J |
| [HDFS-11003](https://issues.apache.org/jira/browse/HDFS-11003) | Expose "XmitsInProgress" through DataNodeMXBean |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13724](https://issues.apache.org/jira/browse/HADOOP-13724) | Fix a few typos in site markdown documents |  Minor | documentation | Andrew Wang | Ding Fei |
| [HDFS-11009](https://issues.apache.org/jira/browse/HDFS-11009) | Add a tool to reconstruct block meta file from CLI |  Major | datanode | Xiao Chen | Xiao Chen |
| [HDFS-9480](https://issues.apache.org/jira/browse/HDFS-9480) |  Expose nonDfsUsed via StorageTypeStats |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12082](https://issues.apache.org/jira/browse/HADOOP-12082) | Support multiple authentication schemes via AuthenticationFilter |  Major | security | Hrishikesh Gadre | Hrishikesh Gadre |
| [HADOOP-13669](https://issues.apache.org/jira/browse/HADOOP-13669) | KMS Server should log exceptions before throwing |  Major | kms | Xiao Chen | Suraj Acharya |
| [HADOOP-13502](https://issues.apache.org/jira/browse/HADOOP-13502) | Split fs.contract.is-blobstore flag into more descriptive flags for use by contract tests. |  Minor | test | Chris Nauroth | Chris Nauroth |
| [HADOOP-13017](https://issues.apache.org/jira/browse/HADOOP-13017) | Implementations of InputStream.read(buffer, offset, bytes) to exit 0 if bytes==0 |  Major | fs, io | Steve Loughran | Steve Loughran |
| [HDFS-11055](https://issues.apache.org/jira/browse/HDFS-11055) | Update default-log4j.properties for httpfs to imporve test logging |  Major | httpfs, test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4963](https://issues.apache.org/jira/browse/YARN-4963) | capacity scheduler: Make number of OFF\_SWITCH assignments per heartbeat configurable |  Major | capacityscheduler | Nathan Roberts | Nathan Roberts |
| [HDFS-11047](https://issues.apache.org/jira/browse/HDFS-11047) | Remove deep copies of FinalizedReplica to alleviate heap consumption on DataNode |  Major | datanode | Xiaobing Zhou | Xiaobing Zhou |
| [MAPREDUCE-6799](https://issues.apache.org/jira/browse/MAPREDUCE-6799) | Document mapreduce.jobhistory.webapp.https.address in mapred-default.xml |  Minor | documentation, jobhistoryserver | Akira Ajisaka | Yiqun Lin |
| [HADOOP-12325](https://issues.apache.org/jira/browse/HADOOP-12325) | RPC Metrics : Add the ability track and log slow RPCs |  Major | ipc, metrics | Anu Engineer | Anu Engineer |
| [HDFS-11074](https://issues.apache.org/jira/browse/HDFS-11074) | Remove unused method FsDatasetSpi#getFinalizedBlocksOnPersistentStorage |  Major | datanode | Arpit Agarwal | Hanisha Koneru |
| [MAPREDUCE-6795](https://issues.apache.org/jira/browse/MAPREDUCE-6795) | Update the document for JobConf#setNumReduceTasks |  Major | documentation | Akira Ajisaka | Yiqun Lin |
| [HADOOP-13603](https://issues.apache.org/jira/browse/HADOOP-13603) | Ignore package line length checkstyle rule |  Major | build | Shane Kumpf | Shane Kumpf |
| [HADOOP-13583](https://issues.apache.org/jira/browse/HADOOP-13583) | Incorporate checkcompatibility script which runs Java API Compliance Checker |  Major | scripts | Andrew Wang | Andrew Wang |
| [HDFS-11080](https://issues.apache.org/jira/browse/HDFS-11080) | Update HttpFS to use ConfigRedactor |  Major | . | Sean Mackrory | Sean Mackrory |
| [YARN-5697](https://issues.apache.org/jira/browse/YARN-5697) | Use CliParser to parse options in RMAdminCLI |  Major | . | Tao Jie | Tao Jie |
| [HADOOP-12453](https://issues.apache.org/jira/browse/HADOOP-12453) | Support decoding KMS Delegation Token with its own Identifier |  Major | kms, security | Xiaoyu Yao | Xiaoyu Yao |
| [HADOOP-7930](https://issues.apache.org/jira/browse/HADOOP-7930) | Kerberos relogin interval in UserGroupInformation should be configurable |  Major | security | Alejandro Abdelnur | Robert Kanter |
| [YARN-5720](https://issues.apache.org/jira/browse/YARN-5720) | Update document for "rmadmin -replaceLabelOnNode" |  Minor | . | Tao Jie | Tao Jie |
| [HADOOP-13782](https://issues.apache.org/jira/browse/HADOOP-13782) | Make MutableRates metrics thread-local write, aggregate-on-read |  Major | metrics | Erik Krogen | Erik Krogen |
| [HADOOP-13590](https://issues.apache.org/jira/browse/HADOOP-13590) | Retry until TGT expires even if the UGI renewal thread encountered exception |  Major | security | Xiao Chen | Xiao Chen |
| [HDFS-11120](https://issues.apache.org/jira/browse/HDFS-11120) | TestEncryptionZones should waitActive |  Minor | test | Xiao Chen | John Zhuge |
| [HADOOP-13720](https://issues.apache.org/jira/browse/HADOOP-13720) | Add more info to the msgs printed in AbstractDelegationTokenSecretManager for better supportability |  Trivial | common, security | Yongjun Zhang | Yongjun Zhang |
| [HDFS-10941](https://issues.apache.org/jira/browse/HDFS-10941) | Improve BlockManager#processMisReplicatesAsync log |  Major | namenode | Xiaoyu Yao | Chen Liang |
| [HADOOP-13810](https://issues.apache.org/jira/browse/HADOOP-13810) | Add a test to verify that Configuration handles &-encoded characters |  Minor | test | Steve Loughran | Steve Loughran |
| [HADOOP-13742](https://issues.apache.org/jira/browse/HADOOP-13742) | Expose "NumOpenConnectionsPerUser" as a metric |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13646](https://issues.apache.org/jira/browse/HADOOP-13646) | Remove outdated overview.html |  Minor | . | Akira Ajisaka | Brahma Reddy Battula |
| [HADOOP-13166](https://issues.apache.org/jira/browse/HADOOP-13166) | add getFileStatus("/") test to AbstractContractGetFileStatusTest |  Minor | fs, test | Steve Loughran | Steve Loughran |
| [HADOOP-11603](https://issues.apache.org/jira/browse/HADOOP-11603) | Metric Snapshot log can be changed #MetricsSystemImpl.java since all the services will be initialized |  Minor | metrics | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-10776](https://issues.apache.org/jira/browse/HADOOP-10776) | Open up already widely-used APIs for delegation-token fetching & renewal to ecosystem projects |  Blocker | . | Robert Joseph Evans | Vinod Kumar Vavilapalli |
| [HDFS-11175](https://issues.apache.org/jira/browse/HDFS-11175) | Document uppercase key names are not supported in TransparentEncryption.md |  Minor | documentation | Yuanbo Liu | Yiqun Lin |
| [HADOOP-13790](https://issues.apache.org/jira/browse/HADOOP-13790) | Make qbt script executable |  Trivial | scripts | Andrew Wang | Andrew Wang |
| [HDFS-8674](https://issues.apache.org/jira/browse/HDFS-8674) | Improve performance of postponed block scans |  Critical | namenode | Daryn Sharp | Daryn Sharp |
| [HDFS-10581](https://issues.apache.org/jira/browse/HDFS-10581) | Hide redundant table on NameNode WebUI when no nodes are decomissioning |  Trivial | hdfs, ui | Weiwei Yang | Weiwei Yang |
| [HDFS-11217](https://issues.apache.org/jira/browse/HDFS-11217) | Annotate NameNode and DataNode MXBean interfaces as Private/Stable |  Major | . | Akira Ajisaka | Jagadesh Kiran N |
| [HADOOP-13900](https://issues.apache.org/jira/browse/HADOOP-13900) | Remove snapshot version of SDK dependency from Azure Data Lake Store File System |  Major | fs/adl | Vishwajeet Dusane | Vishwajeet Dusane |
| [HDFS-11249](https://issues.apache.org/jira/browse/HDFS-11249) | Redundant toString() in DFSConfigKeys.java |  Trivial | . | Akira Ajisaka | Jagadesh Kiran N |
| [YARN-5882](https://issues.apache.org/jira/browse/YARN-5882) | Test only changes from YARN-4126 |  Major | . | Andrew Wang | Jian He |
| [HDFS-11262](https://issues.apache.org/jira/browse/HDFS-11262) | Remove unused variables in FSImage.java |  Trivial | . | Akira Ajisaka | Jagadesh Kiran N |
| [YARN-4994](https://issues.apache.org/jira/browse/YARN-4994) | Use MiniYARNCluster with try-with-resources in tests |  Trivial | test | Andras Bokor | Andras Bokor |
| [YARN-5709](https://issues.apache.org/jira/browse/YARN-5709) | Cleanup leader election configs and pluggability |  Critical | resourcemanager | Karthik Kambatla | Karthik Kambatla |
| [HDFS-9483](https://issues.apache.org/jira/browse/HDFS-9483) | Documentation does not cover use of "swebhdfs" as URL scheme for SSL-secured WebHDFS. |  Major | documentation | Chris Nauroth | Surendra Singh Lilhore |
| [HDFS-11292](https://issues.apache.org/jira/browse/HDFS-11292) | log lastWrittenTxId etc info in logSyncAll |  Major | hdfs | Yongjun Zhang | Yongjun Zhang |
| [HADOOP-13956](https://issues.apache.org/jira/browse/HADOOP-13956) | Read ADLS credentials from Credential Provider |  Critical | fs/adl | John Zhuge | John Zhuge |
| [HADOOP-13962](https://issues.apache.org/jira/browse/HADOOP-13962) | Update ADLS SDK to 2.1.4 |  Major | fs/adl | John Zhuge | John Zhuge |
| [HADOOP-13037](https://issues.apache.org/jira/browse/HADOOP-13037) | Refactor Azure Data Lake Store as an independent FileSystem |  Major | fs/adl | Shrikant Naidu | Vishwajeet Dusane |
| [HADOOP-13946](https://issues.apache.org/jira/browse/HADOOP-13946) | Document how HDFS updates timestamps in the FS spec; compare with object stores |  Minor | documentation, fs | Steve Loughran | Steve Loughran |
| [HDFS-10601](https://issues.apache.org/jira/browse/HDFS-10601) | Improve log message to include hostname when the NameNode is in safemode |  Minor | . | Kuhu Shukla | Kuhu Shukla |


### BUG FIXES:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-8818](https://issues.apache.org/jira/browse/HADOOP-8818) | Should use equals() rather than == to compare String or Text in MD5MD5CRC32FileChecksum and TFileDumper |  Minor | fs, io | Brandon Li | Brandon Li |
| [HADOOP-8436](https://issues.apache.org/jira/browse/HADOOP-8436) | NPE In getLocalPathForWrite ( path, conf ) when the required context item is not configured |  Major | fs | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-9121](https://issues.apache.org/jira/browse/HADOOP-9121) | InodeTree.java has redundant check for vName while throwing exception |  Major | fs | Arup Malakar | Arup Malakar |
| [HADOOP-9242](https://issues.apache.org/jira/browse/HADOOP-9242) | Duplicate surefire plugin config in hadoop-common |  Major | test | Andrey Klochkov | Andrey Klochkov |
| [HADOOP-8419](https://issues.apache.org/jira/browse/HADOOP-8419) | GzipCodec NPE upon reset with IBM JDK |  Major | io | Luke Lu | Yu Li |
| [HDFS-4366](https://issues.apache.org/jira/browse/HDFS-4366) | Block Replication Policy Implementation May Skip Higher-Priority Blocks for Lower-Priority Blocks |  Major | . | Derek Dagit | Derek Dagit |
| [HADOOP-11559](https://issues.apache.org/jira/browse/HADOOP-11559) | Add links to RackAwareness and InterfaceClassification to site index |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-11581](https://issues.apache.org/jira/browse/HADOOP-11581) | Fix Multithreaded correctness Warnings #org.apache.hadoop.fs.shell.Ls |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-11568](https://issues.apache.org/jira/browse/HADOOP-11568) | Description on usage of classpath in hadoop command is incomplete. |  Trivial | tools | Archana T | Archana T |
| [HADOOP-10027](https://issues.apache.org/jira/browse/HADOOP-10027) | \*Compressor\_deflateBytesDirect passes instance instead of jclass to GetStaticObjectField |  Minor | native | Eric Abbott | Hui Zheng |
| [HDFS-5356](https://issues.apache.org/jira/browse/HDFS-5356) | MiniDFSCluster shoud close all open FileSystems when shutdown() |  Critical | test | haosdent | Rakesh R |
| [YARN-3197](https://issues.apache.org/jira/browse/YARN-3197) | Confusing log generated by CapacityScheduler |  Minor | capacityscheduler | Hitesh Shah | Varun Saxena |
| [YARN-3243](https://issues.apache.org/jira/browse/YARN-3243) | CapacityScheduler should pass headroom from parent to children to make sure ParentQueue obey its capacity limits. |  Major | capacityscheduler, resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-3305](https://issues.apache.org/jira/browse/YARN-3305) | AM-Used Resource for leafqueue is wrongly populated if AM ResourceRequest is less than minimumAllocation |  Major | scheduler | Rohith Sharma K S | Rohith Sharma K S |
| [YARN-3205](https://issues.apache.org/jira/browse/YARN-3205) | FileSystemRMStateStore should disable FileSystem Cache to avoid get a Filesystem with an old configuration. |  Major | resourcemanager | zhihai xu | zhihai xu |
| [MAPREDUCE-5807](https://issues.apache.org/jira/browse/MAPREDUCE-5807) | Print usage for TeraSort job. |  Trivial | examples | Rohith Sharma K S | Rohith Sharma K S |
| [YARN-3351](https://issues.apache.org/jira/browse/YARN-3351) | AppMaster tracking URL is broken in HA |  Major | webapp | Anubhav Dhoot | Anubhav Dhoot |
| [HDFS-7867](https://issues.apache.org/jira/browse/HDFS-7867) | Update action param from "start" to "prepare" in rolling upgrade javadoc |  Trivial | . | J.Andreina | J.Andreina |
| [MAPREDUCE-6281](https://issues.apache.org/jira/browse/MAPREDUCE-6281) | Fix javadoc in Terasort |  Trivial | . | Albert Chu | Albert Chu |
| [YARN-3269](https://issues.apache.org/jira/browse/YARN-3269) | Yarn.nodemanager.remote-app-log-dir could not be configured to fully qualified path |  Major | . | Xuan Gong | Xuan Gong |
| [MAPREDUCE-6213](https://issues.apache.org/jira/browse/MAPREDUCE-6213) | NullPointerException caused by job history server addr not resolvable |  Minor | applicationmaster | Peng Zhang | Peng Zhang |
| [MAPREDUCE-5448](https://issues.apache.org/jira/browse/MAPREDUCE-5448) | MapFileOutputFormat#getReaders bug with invisible files/folders |  Minor | mrv2 | Maysam Yabandeh | Maysam Yabandeh |
| [MAPREDUCE-6242](https://issues.apache.org/jira/browse/MAPREDUCE-6242) | Progress report log is incredibly excessive in application master |  Major | applicationmaster | Jian Fang | Varun Saxena |
| [HDFS-3325](https://issues.apache.org/jira/browse/HDFS-3325) | When configuring "dfs.namenode.safemode.threshold-pct" to a value greater or equal to 1 there is mismatch in the UI report |  Minor | . | J.Andreina | J.Andreina |
| [YARN-3383](https://issues.apache.org/jira/browse/YARN-3383) | AdminService should use "warn" instead of "info" to log exception when operation fails |  Major | resourcemanager | Wangda Tan | Li Lu |
| [YARN-3397](https://issues.apache.org/jira/browse/YARN-3397) | yarn rmadmin should skip -failover |  Minor | resourcemanager | J.Andreina | J.Andreina |
| [HADOOP-11724](https://issues.apache.org/jira/browse/HADOOP-11724) | DistCp throws NPE when the target directory is root. |  Minor | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [YARN-3400](https://issues.apache.org/jira/browse/YARN-3400) | [JDK 8] Build Failure due to unreported exceptions in RPCUtil |  Major | . | Robert Kanter | Robert Kanter |
| [HDFS-7990](https://issues.apache.org/jira/browse/HDFS-7990) | IBR delete ack should not be delayed |  Major | namenode | Daryn Sharp | Daryn Sharp |
| [HADOOP-11760](https://issues.apache.org/jira/browse/HADOOP-11760) | Fix typo of javadoc in DistCp |  Trivial | . | Chen He | Brahma Reddy Battula |
| [MAPREDUCE-6294](https://issues.apache.org/jira/browse/MAPREDUCE-6294) | Remove an extra parameter described in Javadoc of TockenCache |  Trivial | . | Chen He | Brahma Reddy Battula |
| [HDFS-7501](https://issues.apache.org/jira/browse/HDFS-7501) | TransactionsSinceLastCheckpoint can be negative on SBNs |  Major | namenode | Harsh J | Gautam Gopalakrishnan |
| [HDFS-8002](https://issues.apache.org/jira/browse/HDFS-8002) | Website refers to /trash directory |  Major | documentation | Mike Drob | Brahma Reddy Battula |
| [HDFS-7261](https://issues.apache.org/jira/browse/HDFS-7261) | storageMap is accessed without synchronization in DatanodeDescriptor#updateHeartbeatState() |  Major | . | Ted Yu | Brahma Reddy Battula |
| [HDFS-7997](https://issues.apache.org/jira/browse/HDFS-7997) | The first non-existing xattr should also throw IOException |  Minor | . | zhouyingchao | zhouyingchao |
| [HDFS-6945](https://issues.apache.org/jira/browse/HDFS-6945) | BlockManager should remove a block from excessReplicateMap and decrement ExcessBlocks metric when the block is removed |  Critical | namenode | Akira Ajisaka | Akira Ajisaka |
| [YARN-3425](https://issues.apache.org/jira/browse/YARN-3425) | NPE from RMNodeLabelsManager.serviceStop when NodeLabelsManager.serviceInit failed |  Minor | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-7922](https://issues.apache.org/jira/browse/HDFS-7922) | ShortCircuitCache#close is not releasing ScheduledThreadPoolExecutors |  Major | . | Rakesh R | Rakesh R |
| [HDFS-8026](https://issues.apache.org/jira/browse/HDFS-8026) | Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk |  Minor | . | Colin P. McCabe | Colin P. McCabe |
| [YARN-3415](https://issues.apache.org/jira/browse/YARN-3415) | Non-AM containers can be counted towards amResourceUsage of a Fair Scheduler queue |  Critical | fairscheduler | Rohit Agarwal | zhihai xu |
| [HADOOP-11797](https://issues.apache.org/jira/browse/HADOOP-11797) | releasedocmaker.py needs to put ASF headers on output |  Major | build | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-11800](https://issues.apache.org/jira/browse/HADOOP-11800) | Clean up some test methods in TestCodec.java |  Major | test | Akira Ajisaka | Brahma Reddy Battula |
| [MAPREDUCE-4844](https://issues.apache.org/jira/browse/MAPREDUCE-4844) | Counters / AbstractCounters have constant references not declared final |  Major | . | Gera Shegalov | Brahma Reddy Battula |
| [YARN-3435](https://issues.apache.org/jira/browse/YARN-3435) | AM container to be allocated Appattempt AM container shown as null |  Trivial | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3429](https://issues.apache.org/jira/browse/YARN-3429) | TestAMRMTokens.testTokenExpiry fails Intermittently with error message:Invalid AMRMToken |  Major | test | zhihai xu | zhihai xu |
| [HDFS-5215](https://issues.apache.org/jira/browse/HDFS-5215) | dfs.datanode.du.reserved is not considered while computing available space |  Major | datanode | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-3457](https://issues.apache.org/jira/browse/YARN-3457) | NPE when NodeManager.serviceInit fails and stopRecoveryStore called |  Minor | nodemanager | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3459](https://issues.apache.org/jira/browse/YARN-3459) | Fix failiure of TestLog4jWarningErrorMetricsAppender |  Blocker | . | Li Lu | Varun Vasudev |
| [HDFS-8046](https://issues.apache.org/jira/browse/HDFS-8046) | Allow better control of getContentSummary |  Major | . | Kihwal Lee | Kihwal Lee |
| [YARN-2890](https://issues.apache.org/jira/browse/YARN-2890) | MiniYarnCluster should turn on timeline service if configured to do so |  Major | . | Mit Desai | Mit Desai |
| [HDFS-7725](https://issues.apache.org/jira/browse/HDFS-7725) | Incorrect "nodes in service" metrics caused all writes to fail |  Major | . | Ming Ma | Ming Ma |
| [HDFS-8096](https://issues.apache.org/jira/browse/HDFS-8096) | DatanodeMetrics#blocksReplicated will get incremented early and even for failed transfers |  Major | datanode | Vinayakumar B | Vinayakumar B |
| [YARN-3465](https://issues.apache.org/jira/browse/YARN-3465) | Use LinkedHashMap to preserve order of resource requests |  Major | nodemanager | zhihai xu | zhihai xu |
| [HDFS-8099](https://issues.apache.org/jira/browse/HDFS-8099) | Change "DFSInputStream has been closed already" message to debug log level |  Minor | hdfs-client | Charles Lamb | Charles Lamb |
| [HDFS-8091](https://issues.apache.org/jira/browse/HDFS-8091) | ACLStatus and XAttributes not properly presented to INodeAttributesProvider before returning to client |  Major | namenode | Arun Suresh | Arun Suresh |
| [MAPREDUCE-6266](https://issues.apache.org/jira/browse/MAPREDUCE-6266) | Job#getTrackingURL should consistently return a proper URL |  Minor | . | Ray Chiang | Ray Chiang |
| [HDFS-8081](https://issues.apache.org/jira/browse/HDFS-8081) | Split getAdditionalBlock() into two methods. |  Major | . | Konstantin Shvachko | Konstantin Shvachko |
| [HDFS-7939](https://issues.apache.org/jira/browse/HDFS-7939) | Two fsimage\_rollback\_\* files are created which are not deleted after rollback. |  Critical | . | J.Andreina | J.Andreina |
| [MAPREDUCE-6314](https://issues.apache.org/jira/browse/MAPREDUCE-6314) | TestPipeApplication fails on trunk |  Major | test | Varun Vasudev | Varun Vasudev |
| [YARN-3466](https://issues.apache.org/jira/browse/YARN-3466) | Fix RM nodes web page to sort by node HTTP-address, #containers and node-label column |  Major | resourcemanager, webapp | Jason Lowe | Jason Lowe |
| [HDFS-7931](https://issues.apache.org/jira/browse/HDFS-7931) | DistributedFIleSystem should not look for keyProvider in cache if Encryption is disabled |  Minor | hdfs-client | Arun Suresh | Arun Suresh |
| [HDFS-8111](https://issues.apache.org/jira/browse/HDFS-8111) | NPE thrown when invalid FSImage filename given for "hdfs oiv\_legacy" cmd |  Minor | tools | Archana T | Surendra Singh Lilhore |
| [HADOOP-11811](https://issues.apache.org/jira/browse/HADOOP-11811) | Fix typos in hadoop-project/pom.xml and TestAccessControlList |  Minor | . | Chen He | Brahma Reddy Battula |
| [YARN-3382](https://issues.apache.org/jira/browse/YARN-3382) | Some of UserMetricsInfo metrics are incorrectly set to root queue metrics |  Major | webapp | Rohit Agarwal | Rohit Agarwal |
| [YARN-3472](https://issues.apache.org/jira/browse/YARN-3472) | Possible leak in DelegationTokenRenewer#allTokens |  Major | . | Jian He | Rohith Sharma K S |
| [YARN-3394](https://issues.apache.org/jira/browse/YARN-3394) | WebApplication  proxy documentation is incomplete |  Minor | resourcemanager | Bibin A Chundatt | Naganarasimha G R |
| [HADOOP-11819](https://issues.apache.org/jira/browse/HADOOP-11819) | HttpServerFunctionalTest#prepareTestWebapp should create web app directory if it does not exist. |  Minor | . | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-6666](https://issues.apache.org/jira/browse/HDFS-6666) | Abort NameNode and DataNode startup if security is enabled but block access token is not enabled. |  Minor | datanode, namenode, security | Chris Nauroth | Vijay Bhat |
| [HDFS-8055](https://issues.apache.org/jira/browse/HDFS-8055) | NullPointerException when topology script is missing. |  Major | namenode | Anu Engineer | Anu Engineer |
| [YARN-3266](https://issues.apache.org/jira/browse/YARN-3266) | RMContext inactiveNodes should have NodeId as map key |  Major | resourcemanager | Chengbing Liu | Chengbing Liu |
| [YARN-3436](https://issues.apache.org/jira/browse/YARN-3436) | Fix URIs in documention of YARN web service REST APIs |  Minor | documentation, resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-8127](https://issues.apache.org/jira/browse/HDFS-8127) | NameNode Failover during HA upgrade can cause DataNode to finalize upgrade |  Blocker | ha | Jing Zhao | Jing Zhao |
| [YARN-3462](https://issues.apache.org/jira/browse/YARN-3462) | Patches applied for YARN-2424 are inconsistent between trunk and branch-2 |  Major | . | Sidharta Seethana | Naganarasimha G R |
| [HDFS-8151](https://issues.apache.org/jira/browse/HDFS-8151) | Always use snapshot path as source when invalid snapshot names are used for diff based distcp |  Minor | distcp | Sushmitha Sreenivasan | Jing Zhao |
| [HDFS-7934](https://issues.apache.org/jira/browse/HDFS-7934) | Update RollingUpgrade rollback documentation: should use bootstrapstandby for standby NN |  Critical | documentation | J.Andreina | J.Andreina |
| [HDFS-8149](https://issues.apache.org/jira/browse/HDFS-8149) | The footer of the Web UI "Hadoop, 2014" is old |  Major | . | Akira Ajisaka | Brahma Reddy Battula |
| [HDFS-8142](https://issues.apache.org/jira/browse/HDFS-8142) | DistributedFileSystem encryption zone commands should resolve relative paths |  Major | . | Rakesh R | Rakesh R |
| [MAPREDUCE-6300](https://issues.apache.org/jira/browse/MAPREDUCE-6300) | Task list sort by task id broken |  Minor | . | Siqi Li | Siqi Li |
| [YARN-3021](https://issues.apache.org/jira/browse/YARN-3021) | YARN's delegation-token handling disallows certain trust setups to operate properly over DistCp |  Major | security | Harsh J | Yongjun Zhang |
| [HDFS-8153](https://issues.apache.org/jira/browse/HDFS-8153) | Error Message points to wrong parent directory in case of path component name length error |  Major | namenode | Anu Engineer | Anu Engineer |
| [YARN-3493](https://issues.apache.org/jira/browse/YARN-3493) | RM fails to come up with error "Failed to load/recover state" when  mem settings are changed |  Critical | yarn | Sumana Sathish | Jian He |
| [HDFS-8043](https://issues.apache.org/jira/browse/HDFS-8043) | NPE in MiniDFSCluster teardown |  Major | test | Steve Loughran | Brahma Reddy Battula |
| [HDFS-8173](https://issues.apache.org/jira/browse/HDFS-8173) | NPE thrown at DataNode shutdown when HTTP server was not able to create |  Minor | datanode | Archana T | Surendra Singh Lilhore |
| [YARN-3497](https://issues.apache.org/jira/browse/YARN-3497) | ContainerManagementProtocolProxy modifies IPC timeout conf without making a copy |  Major | client | Jason Lowe | Jason Lowe |
| [MAPREDUCE-6238](https://issues.apache.org/jira/browse/MAPREDUCE-6238) | MR2 can't run local jobs with -libjars command options which is a regression from MR1 |  Critical | mrv2 | zhihai xu | zhihai xu |
| [HDFS-8179](https://issues.apache.org/jira/browse/HDFS-8179) | DFSClient#getServerDefaults returns null within 1 hour of system start |  Blocker | . | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-7993](https://issues.apache.org/jira/browse/HDFS-7993) | Provide each Replica details in fsck |  Major | . | Ming Ma | J.Andreina |
| [HDFS-8163](https://issues.apache.org/jira/browse/HDFS-8163) | Using monotonicNow for block report scheduling causes test failures on recently restarted systems |  Blocker | datanode | Arpit Agarwal | Arpit Agarwal |
| [HADOOP-11704](https://issues.apache.org/jira/browse/HADOOP-11704) | DelegationTokenAuthenticationFilter must pass ipaddress instead of hostname to ProxyUsers#authorize() |  Major | . | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-3495](https://issues.apache.org/jira/browse/YARN-3495) | Confusing log generated by FairScheduler |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6293](https://issues.apache.org/jira/browse/MAPREDUCE-6293) | Set job classloader on uber-job's LocalContainerLauncher event thread |  Major | mr-am | Sangjin Lee | Sangjin Lee |
| [HADOOP-11846](https://issues.apache.org/jira/browse/HADOOP-11846) | TestCertificateUtil.testCorruptPEM failing on Jenkins JDK8 |  Major | build, security | Steve Loughran | Larry McCay |
| [HADOOP-11859](https://issues.apache.org/jira/browse/HADOOP-11859) | PseudoAuthenticationHandler fails with httpcomponents v4.4 |  Major | . | Eugene Koifman | Eugene Koifman |
| [MAPREDUCE-6330](https://issues.apache.org/jira/browse/MAPREDUCE-6330) | Fix typo in Task Attempt API's URL in documentations |  Minor | documentation | Ryu Kobayashi | Ryu Kobayashi |
| [HADOOP-11848](https://issues.apache.org/jira/browse/HADOOP-11848) | Incorrect arguments to sizeof in DomainSocket.c |  Major | native | Malcolm Kavalsky | Malcolm Kavalsky |
| [HADOOP-11868](https://issues.apache.org/jira/browse/HADOOP-11868) | Invalid user logins trigger large backtraces in server log |  Major | . | Chang Li | Chang Li |
| [HADOOP-11861](https://issues.apache.org/jira/browse/HADOOP-11861) | test-patch.sh rewrite addendum patch |  Major | build | Anu Engineer | Allen Wittenauer |
| [HADOOP-11864](https://issues.apache.org/jira/browse/HADOOP-11864) | JWTRedirectAuthenticationHandler breaks java8 javadocs |  Major | build | Steve Loughran | Larry McCay |
| [HDFS-4448](https://issues.apache.org/jira/browse/HDFS-4448) | Allow HA NN to start in secure mode with wildcard address configured |  Major | ha, namenode, security | Aaron T. Myers | Aaron T. Myers |
| [YARN-3522](https://issues.apache.org/jira/browse/YARN-3522) | DistributedShell uses the wrong user to put timeline data |  Blocker | timelineserver | Zhijie Shen | Zhijie Shen |
| [HDFS-8147](https://issues.apache.org/jira/browse/HDFS-8147) | Mover should not schedule two replicas to the same DN storage |  Major | balancer & mover | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-11872](https://issues.apache.org/jira/browse/HADOOP-11872) | "hadoop dfs" command prints message about using "yarn jar" on Windows(branch-2 only) |  Minor | scripts | Varun Vasudev | Varun Vasudev |
| [HADOOP-11730](https://issues.apache.org/jira/browse/HADOOP-11730) | Regression: s3n read failure recovery broken |  Major | fs/s3 | Takenori Sato | Takenori Sato |
| [YARN-3516](https://issues.apache.org/jira/browse/YARN-3516) | killing ContainerLocalizer action doesn't take effect when private localizer receives FETCH\_FAILURE status. |  Minor | nodemanager | zhihai xu | zhihai xu |
| [HADOOP-11802](https://issues.apache.org/jira/browse/HADOOP-11802) | DomainSocketWatcher thread terminates sometimes after there is an I/O error during requestShortCircuitShm |  Major | . | Eric Payne | Colin P. McCabe |
| [HDFS-8070](https://issues.apache.org/jira/browse/HDFS-8070) | Pre-HDFS-7915 DFSClient cannot use short circuit on post-HDFS-7915 DataNode |  Blocker | caching | Gopal V | Colin P. McCabe |
| [HDFS-8217](https://issues.apache.org/jira/browse/HDFS-8217) | During block recovery for truncate Log new Block Id in case of copy-on-truncate is true. |  Major | datanode | Vinayakumar B | Vinayakumar B |
| [HDFS-8231](https://issues.apache.org/jira/browse/HDFS-8231) | StackTrace displayed at client while QuotaByStorageType exceeds |  Major | hdfs-client | J.Andreina | J.Andreina |
| [HDFS-8191](https://issues.apache.org/jira/browse/HDFS-8191) | Fix byte to integer casting in SimulatedFSDataset#simulatedByte |  Minor | . | Zhe Zhang | Zhe Zhang |
| [YARN-3387](https://issues.apache.org/jira/browse/YARN-3387) | Previous AM's container complete message couldn't pass to current am if am restarted and rm changed |  Critical | resourcemanager | sandflee | sandflee |
| [HADOOP-11876](https://issues.apache.org/jira/browse/HADOOP-11876) | Refactor code to make it more readable, minor maybePrintStats bug |  Trivial | tools/distcp | Zoran Dimitrijevic | Zoran Dimitrijevic |
| [YARN-3444](https://issues.apache.org/jira/browse/YARN-3444) | Fix typo capabililty |  Trivial | applications/distributed-shell | Gabor Liptak | Gabor Liptak |
| [YARN-3537](https://issues.apache.org/jira/browse/YARN-3537) | NPE when NodeManager.serviceInit fails and stopRecoveryStore invoked |  Major | nodemanager | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-8211](https://issues.apache.org/jira/browse/HDFS-8211) | DataNode UUID is always null in the JMX counter |  Major | datanode | Anu Engineer | Anu Engineer |
| [MAPREDUCE-6333](https://issues.apache.org/jira/browse/MAPREDUCE-6333) | TestEvents,TestAMWebServicesTasks,TestAppController are broken due to MAPREDUCE-6297 |  Major | . | Siqi Li | Siqi Li |
| [HDFS-8206](https://issues.apache.org/jira/browse/HDFS-8206) | Fix the typos in hadoop-hdfs-httpfs |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-3464](https://issues.apache.org/jira/browse/YARN-3464) | Race condition in LocalizerRunner kills localizer before localizing all resources |  Critical | nodemanager | zhihai xu | zhihai xu |
| [MAPREDUCE-6252](https://issues.apache.org/jira/browse/MAPREDUCE-6252) | JobHistoryServer should not fail when encountering a missing directory |  Major | jobhistoryserver | Craig Welch | Craig Welch |
| [YARN-3530](https://issues.apache.org/jira/browse/YARN-3530) | ATS throws exception on trying to filter results without otherinfo. |  Critical | timelineserver | Sreenath Somarajapuram | Zhijie Shen |
| [HDFS-8205](https://issues.apache.org/jira/browse/HDFS-8205) | CommandFormat#parse() should not parse option as value of option |  Blocker | . | Peter Shi | Peter Shi |
| [HADOOP-11870](https://issues.apache.org/jira/browse/HADOOP-11870) | [JDK8] AuthenticationFilter, CertificateUtil, SignerSecretProviders, KeyAuthorizationKeyProvider Javadoc issues |  Major | build | Robert Kanter | Robert Kanter |
| [MAPREDUCE-6324](https://issues.apache.org/jira/browse/MAPREDUCE-6324) | Uber jobs fail to update AMRM token when it rolls over |  Blocker | mr-am | Jason Lowe | Jason Lowe |
| [HDFS-8232](https://issues.apache.org/jira/browse/HDFS-8232) | Missing datanode counters when using Metrics2 sink interface |  Major | datanode | Anu Engineer | Anu Engineer |
| [MAPREDUCE-6334](https://issues.apache.org/jira/browse/MAPREDUCE-6334) | Fetcher#copyMapOutput is leaking usedMemory upon IOException during InMemoryMapOutput shuffle handler |  Blocker | . | Eric Payne | Eric Payne |
| [HDFS-8273](https://issues.apache.org/jira/browse/HDFS-8273) | FSNamesystem#Delete() should not call logSync() when holding the lock |  Blocker | namenode | Jing Zhao | Haohui Mai |
| [YARN-3485](https://issues.apache.org/jira/browse/YARN-3485) | FairScheduler headroom calculation doesn't consider maxResources for Fifo and FairShare policies |  Critical | fairscheduler | Karthik Kambatla | Karthik Kambatla |
| [HDFS-8269](https://issues.apache.org/jira/browse/HDFS-8269) | getBlockLocations() does not resolve the .reserved path and generates incorrect edit logs when updating the atime |  Blocker | . | Yesha Vora | Haohui Mai |
| [YARN-3517](https://issues.apache.org/jira/browse/YARN-3517) | RM web ui for dumping scheduler logs should be for admins only |  Blocker | resourcemanager, security | Varun Vasudev | Varun Vasudev |
| [HDFS-8214](https://issues.apache.org/jira/browse/HDFS-8214) | Secondary NN Web UI shows wrong date for Last Checkpoint |  Major | namenode | Charles Lamb | Charles Lamb |
| [YARN-3533](https://issues.apache.org/jira/browse/YARN-3533) | Test: Fix launchAM in MockRM to wait for attempt to be scheduled |  Major | yarn | Anubhav Dhoot | Anubhav Dhoot |
| [MAPREDUCE-6339](https://issues.apache.org/jira/browse/MAPREDUCE-6339) | Job history file is not flushed correctly because isTimerActive flag is not set true when flushTimerTask is scheduled. |  Critical | mrv2 | zhihai xu | zhihai xu |
| [HADOOP-11821](https://issues.apache.org/jira/browse/HADOOP-11821) | Fix findbugs warnings in hadoop-sls |  Major | tools | Akira Ajisaka | Brahma Reddy Battula |
| [YARN-3564](https://issues.apache.org/jira/browse/YARN-3564) | Fix TestContainerAllocation.testAMContainerAllocationWhenDNSUnavailable fails randomly |  Major | . | Jian He | Jian He |
| [HADOOP-11891](https://issues.apache.org/jira/browse/HADOOP-11891) | OsSecureRandom should lazily fill its reservoir |  Major | security | Arun Suresh | Arun Suresh |
| [HADOOP-11866](https://issues.apache.org/jira/browse/HADOOP-11866) | increase readability and reliability of checkstyle, shellcheck, and whitespace reports |  Minor | . | Naganarasimha G R | Allen Wittenauer |
| [HDFS-8292](https://issues.apache.org/jira/browse/HDFS-8292) | Move conditional in fmt\_time from dfs-dust.js to status.html |  Minor | namenode | Charles Lamb | Charles Lamb |
| [HDFS-8300](https://issues.apache.org/jira/browse/HDFS-8300) | Fix unit test failures and findbugs warning caused by HDFS-8283 |  Major | . | Jing Zhao | Jing Zhao |
| [HDFS-8276](https://issues.apache.org/jira/browse/HDFS-8276) | LazyPersistFileScrubber should be disabled if scrubber interval configured zero |  Major | namenode | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-11889](https://issues.apache.org/jira/browse/HADOOP-11889) | Make checkstyle runnable from root project |  Major | build, test | Gera Shegalov | Gera Shegalov |
| [HDFS-8213](https://issues.apache.org/jira/browse/HDFS-8213) | DFSClient should use hdfs.client.htrace HTrace configuration prefix rather than hadoop.htrace |  Critical | . | Billie Rinaldi | Colin P. McCabe |
| [HDFS-8229](https://issues.apache.org/jira/browse/HDFS-8229) | LAZY\_PERSIST file gets deleted after NameNode restart. |  Major | namenode | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [YARN-2893](https://issues.apache.org/jira/browse/YARN-2893) | AMLaucher: sporadic job failures due to EOFException in readTokenStorageStream |  Major | resourcemanager | Gera Shegalov | zhihai xu |
| [HADOOP-11491](https://issues.apache.org/jira/browse/HADOOP-11491) | HarFs incorrectly declared as requiring an authority |  Critical | fs | Gera Shegalov | Brahma Reddy Battula |
| [HADOOP-11900](https://issues.apache.org/jira/browse/HADOOP-11900) | Add failIfNoTests=false to hadoop-build-tools pom |  Major | test | Gera Shegalov | Gera Shegalov |
| [MAPREDUCE-6345](https://issues.apache.org/jira/browse/MAPREDUCE-6345) | Documentation fix for when CRLA is enabled for MRAppMaster logs |  Trivial | documentation | Rohit Agarwal | Rohit Agarwal |
| [YARN-2454](https://issues.apache.org/jira/browse/YARN-2454) | Fix compareTo of variable UNBOUNDED in o.a.h.y.util.resource.Resources. |  Major | . | Xu Yang | Xu Yang |
| [YARN-1993](https://issues.apache.org/jira/browse/YARN-1993) | Cross-site scripting vulnerability in TextView.java |  Major | webapp | Ted Yu | Kenji Kikushima |
| [MAPREDUCE-5905](https://issues.apache.org/jira/browse/MAPREDUCE-5905) | CountersStrings.toEscapedCompactStrings outputs unnecessary "null" strings |  Minor | . | Akira Ajisaka | Akira Ajisaka |
| [MAPREDUCE-6349](https://issues.apache.org/jira/browse/MAPREDUCE-6349) | Fix typo in property org.apache.hadoop.mapreduce.lib.chain.Chain.REDUCER\_INPUT\_VALUE\_CLASS |  Minor | . | Ray Chiang | Ray Chiang |
| [HADOOP-9658](https://issues.apache.org/jira/browse/HADOOP-9658) | SnappyCodec#checkNativeCodeLoaded may unexpectedly fail when native code is not loaded |  Major | . | Zhijie Shen | Zhijie Shen |
| [YARN-3097](https://issues.apache.org/jira/browse/YARN-3097) | Logging of resource recovery on NM restart has redundancies |  Minor | nodemanager | Jason Lowe | Eric Payne |
| [HDFS-8290](https://issues.apache.org/jira/browse/HDFS-8290) | WebHDFS calls before namesystem initialization can cause NullPointerException. |  Minor | webhdfs | Chris Nauroth | Chris Nauroth |
| [MAPREDUCE-5649](https://issues.apache.org/jira/browse/MAPREDUCE-5649) | Reduce cannot use more than 2G memory  for the final merge |  Major | mrv2 | stanley shi | Gera Shegalov |
| [MAPREDUCE-6259](https://issues.apache.org/jira/browse/MAPREDUCE-6259) | IllegalArgumentException due to missing job submit time |  Major | jobhistoryserver | zhihai xu | zhihai xu |
| [YARN-3375](https://issues.apache.org/jira/browse/YARN-3375) | NodeHealthScriptRunner.shouldRun() check is performing 3 times for starting NodeHealthScriptRunner |  Minor | nodemanager | Devaraj K | Devaraj K |
| [YARN-2725](https://issues.apache.org/jira/browse/YARN-2725) | Adding test cases of retrying requests about ZKRMStateStore |  Major | . | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| [MAPREDUCE-6165](https://issues.apache.org/jira/browse/MAPREDUCE-6165) | [JDK8] TestCombineFileInputFormat failed on JDK8 |  Minor | . | Wei Yan | Akira Ajisaka |
| [HADOOP-11328](https://issues.apache.org/jira/browse/HADOOP-11328) | ZKFailoverController does not log Exception when doRun raises errors |  Major | ha | Tianyin Xu | Tianyin Xu |
| [HADOOP-11916](https://issues.apache.org/jira/browse/HADOOP-11916) | TestStringUtils#testLowerAndUpperStrings failed on MAC due to a JVM bug |  Minor | . | Ming Ma | Ming Ma |
| [YARN-3552](https://issues.apache.org/jira/browse/YARN-3552) | RM Web UI shows -1 running containers for completed apps |  Trivial | webapp | Rohith Sharma K S | Rohith Sharma K S |
| [HADOOP-11120](https://issues.apache.org/jira/browse/HADOOP-11120) | hadoop fs -rmr gives wrong advice |  Major | . | Allen Wittenauer | Juliet Hougland |
| [YARN-3396](https://issues.apache.org/jira/browse/YARN-3396) | Handle URISyntaxException in ResourceLocalizationService |  Major | nodemanager | Chengbing Liu | Brahma Reddy Battula |
| [YARN-2123](https://issues.apache.org/jira/browse/YARN-2123) | Progress bars in Web UI always at 100% due to non-US locale |  Major | webapp | Johannes Simon | Akira Ajisaka |
| [HDFS-8305](https://issues.apache.org/jira/browse/HDFS-8305) | HDFS INotify: the destination field of RenameOp should always end with the file name |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HADOOP-11917](https://issues.apache.org/jira/browse/HADOOP-11917) | test-patch.sh should work with ${BASEDIR}/patchprocess setups |  Blocker | . | Allen Wittenauer | Allen Wittenauer |
| [HDFS-7847](https://issues.apache.org/jira/browse/HDFS-7847) | Modify NNThroughputBenchmark to be able to operate on a remote NameNode |  Major | . | Colin P. McCabe | Charles Lamb |
| [HDFS-8219](https://issues.apache.org/jira/browse/HDFS-8219) | setStoragePolicy with folder behavior is different after cluster restart |  Major | . | Peter Shi | Surendra Singh Lilhore |
| [HADOOP-11898](https://issues.apache.org/jira/browse/HADOOP-11898) | add nfs3 and portmap starting command in hadoop-daemon.sh in branch-2 |  Minor | bin, nfs | Brandon Li | Brandon Li |
| [HADOOP-11926](https://issues.apache.org/jira/browse/HADOOP-11926) | test-patch.sh mv does wrong math |  Major | . | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-11912](https://issues.apache.org/jira/browse/HADOOP-11912) | Extra configuration key used in TraceUtils should respect prefix |  Minor | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3582](https://issues.apache.org/jira/browse/YARN-3582) | NPE in WebAppProxyServlet |  Major | . | Jian He | Jian He |
| [HDFS-2484](https://issues.apache.org/jira/browse/HDFS-2484) | checkLease should throw FileNotFoundException when file does not exist |  Major | namenode | Konstantin Shvachko | Rakesh R |
| [YARN-3385](https://issues.apache.org/jira/browse/YARN-3385) | Race condition: KeeperException$NoNodeException will cause RM shutdown during ZK node deletion. |  Critical | resourcemanager | zhihai xu | zhihai xu |
| [HDFS-7833](https://issues.apache.org/jira/browse/HDFS-7833) | DataNode reconfiguration does not recalculate valid volumes required, based on configured failed volumes tolerated. |  Major | datanode | Chris Nauroth | Lei (Eddy) Xu |
| [YARN-3577](https://issues.apache.org/jira/browse/YARN-3577) | Misspelling of threshold in log4j.properties for tests |  Minor | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-8325](https://issues.apache.org/jira/browse/HDFS-8325) | Misspelling of threshold in log4j.properties for tests |  Minor | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-10387](https://issues.apache.org/jira/browse/HADOOP-10387) | Misspelling of threshold in log4j.properties for tests in hadoop-common-project |  Minor | conf, test | Kenji Kikushima | Brahma Reddy Battula |
| [MAPREDUCE-6356](https://issues.apache.org/jira/browse/MAPREDUCE-6356) | Misspelling of threshold in log4j.properties for tests |  Minor | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-3523](https://issues.apache.org/jira/browse/YARN-3523) | Cleanup ResourceManagerAdministrationProtocol interface audience |  Major | client, resourcemanager | Wangda Tan | Naganarasimha G R |
| [HDFS-7980](https://issues.apache.org/jira/browse/HDFS-7980) | Incremental BlockReport will dramatically slow down the startup of  a namenode |  Major | . | Hui Zheng | Walter Su |
| [HADOOP-11936](https://issues.apache.org/jira/browse/HADOOP-11936) | Dockerfile references a removed image |  Major | . | Allen Wittenauer | Allen Wittenauer |
| [YARN-3584](https://issues.apache.org/jira/browse/YARN-3584) | [Log mesage correction] : MIssing space in Diagnostics message |  Trivial | . | nijel | nijel |
| [HDFS-8321](https://issues.apache.org/jira/browse/HDFS-8321) | CacheDirectives and CachePool operations should throw RetriableException in safemode |  Major | . | Haohui Mai | Haohui Mai |
| [HDFS-8037](https://issues.apache.org/jira/browse/HDFS-8037) | CheckAccess in WebHDFS silently accepts malformed FsActions parameters |  Minor | webhdfs | Jake Low | Walter Su |
| [YARN-1832](https://issues.apache.org/jira/browse/YARN-1832) | Fix wrong MockLocalizerStatus#equals implementation |  Minor | nodemanager | Hong Zhiguo | Hong Zhiguo |
| [YARN-3572](https://issues.apache.org/jira/browse/YARN-3572) | Correct typos in WritingYarnApplications.md |  Minor | documentation | Sandeep Khurana | Gabor Liptak |
| [HADOOP-11922](https://issues.apache.org/jira/browse/HADOOP-11922) | Misspelling of threshold in log4j.properties for tests in hadoop-tools |  Minor | . | Brahma Reddy Battula | Gabor Liptak |
| [HDFS-8257](https://issues.apache.org/jira/browse/HDFS-8257) | Namenode rollingUpgrade option is incorrect in document |  Major | documentation | J.Andreina | J.Andreina |
| [HDFS-8067](https://issues.apache.org/jira/browse/HDFS-8067) | haadmin prints out stale help messages |  Minor | hdfs-client | Ajith S | Ajith S |
| [YARN-3592](https://issues.apache.org/jira/browse/YARN-3592) | Fix typos in RMNodeLabelsManager |  Trivial | resourcemanager | Junping Du | Sunil G |
| [HDFS-8174](https://issues.apache.org/jira/browse/HDFS-8174) | Update replication count to live rep count in fsck report |  Minor | . | J.Andreina | J.Andreina |
| [HDFS-6291](https://issues.apache.org/jira/browse/HDFS-6291) | FSImage may be left unclosed in BootstrapStandby#doRun() |  Minor | ha | Ted Yu | Sanghyun Yun |
| [YARN-3358](https://issues.apache.org/jira/browse/YARN-3358) | Audit log not present while refreshing Service ACLs |  Minor | resourcemanager | Varun Saxena | Varun Saxena |
| [YARN-3589](https://issues.apache.org/jira/browse/YARN-3589) | RM and AH web UI display DOCTYPE wrongly |  Major | webapp | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-7998](https://issues.apache.org/jira/browse/HDFS-7998) | HDFS Federation : Command mentioned to add a NN to existing federated cluster is wrong |  Minor | documentation | Ajith S | Ajith S |
| [HDFS-8222](https://issues.apache.org/jira/browse/HDFS-8222) | Remove usage of "dfsadmin -upgradeProgress " from document which  is no longer supported |  Major | documentation | J.Andreina | J.Andreina |
| [HDFS-8187](https://issues.apache.org/jira/browse/HDFS-8187) | Remove usage of "-setStoragePolicy" and "-getStoragePolicy" using dfsadmin cmd (as it is not been supported) |  Major | documentation | J.Andreina | J.Andreina |
| [HDFS-8175](https://issues.apache.org/jira/browse/HDFS-8175) | Provide information on snapshotDiff for supporting the comparison between snapshot and current status |  Major | documentation | J.Andreina | J.Andreina |
| [MAPREDUCE-6342](https://issues.apache.org/jira/browse/MAPREDUCE-6342) | Make POM project names consistent |  Minor | build | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-6576](https://issues.apache.org/jira/browse/HDFS-6576) | Datanode log is generating at root directory in security mode |  Minor | datanode, scripts | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-11877](https://issues.apache.org/jira/browse/HADOOP-11877) | SnappyDecompressor's Logger class name is wrong |  Major | conf | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-3384](https://issues.apache.org/jira/browse/HDFS-3384) | DataStreamer thread should be closed immediatly when failed to setup a PipelineForAppendOrRecovery |  Major | hdfs-client | Brahma Reddy Battula | Uma Maheswara Rao G |
| [YARN-3554](https://issues.apache.org/jira/browse/YARN-3554) | Default value for maximum nodemanager connect wait time is too high |  Major | . | Jason Lowe | Naganarasimha G R |
| [HDFS-7894](https://issues.apache.org/jira/browse/HDFS-7894) | Rolling upgrade readiness is not updated in jmx until query command is issued. |  Critical | . | Kihwal Lee | Brahma Reddy Battula |
| [YARN-3600](https://issues.apache.org/jira/browse/YARN-3600) | AM container link is broken (on a killed application, at least) |  Major | . | Sergey Shelukhin | Naganarasimha G R |
| [HDFS-8346](https://issues.apache.org/jira/browse/HDFS-8346) | libwebhdfs build fails during link due to unresolved external symbols. |  Major | native | Chris Nauroth | Chris Nauroth |
| [HDFS-8274](https://issues.apache.org/jira/browse/HDFS-8274) | NFS configuration nfs.dump.dir not working |  Major | nfs | Ajith S | Ajith S |
| [HDFS-8340](https://issues.apache.org/jira/browse/HDFS-8340) | Fix NFS documentation of nfs.wtmax |  Minor | documentation, nfs | Ajith S | Ajith S |
| [HADOOP-10356](https://issues.apache.org/jira/browse/HADOOP-10356) | Corrections in winutils/chmod.c |  Trivial | bin | René Nyffenegger | René Nyffenegger |
| [HADOOP-7165](https://issues.apache.org/jira/browse/HADOOP-7165) | listLocatedStatus(path, filter) is not redefined in FilterFs |  Major | fs | Hairong Kuang | Hairong Kuang |
| [MAPREDUCE-3383](https://issues.apache.org/jira/browse/MAPREDUCE-3383) | Duplicate job.getOutputValueGroupingComparator() in ReduceTask |  Major | . | Binglin Chang | Binglin Chang |
| [HDFS-8311](https://issues.apache.org/jira/browse/HDFS-8311) | DataStreamer.transfer() should timeout the socket InputStream. |  Major | hdfs-client | Esteban Gutierrez | Esteban Gutierrez |
| [HDFS-8113](https://issues.apache.org/jira/browse/HDFS-8113) | Add check for null BlockCollection pointers in BlockInfoContiguous structures |  Major | namenode | Chengbing Liu | Chengbing Liu |
| [HADOOP-9729](https://issues.apache.org/jira/browse/HADOOP-9729) | The example code of org.apache.hadoop.util.Tool is incorrect |  Major | util | hellojinjie | hellojinjie |
| [MAPREDUCE-2094](https://issues.apache.org/jira/browse/MAPREDUCE-2094) | LineRecordReader should not seek into non-splittable, compressed streams. |  Major | task | Niels Basjes | Niels Basjes |
| [HDFS-8245](https://issues.apache.org/jira/browse/HDFS-8245) | Standby namenode doesn't process DELETED\_BLOCK if the add block request is in edit log. |  Major | . | Rushabh S Shah | Rushabh S Shah |
| [YARN-3018](https://issues.apache.org/jira/browse/YARN-3018) | Unify the default value for yarn.scheduler.capacity.node-locality-delay in code and default xml file |  Trivial | capacityscheduler | nijel | nijel |
| [HDFS-8326](https://issues.apache.org/jira/browse/HDFS-8326) | Documentation about when checkpoints are run is out of date |  Major | documentation | Misty Stanley-Jones | Misty Stanley-Jones |
| [YARN-3604](https://issues.apache.org/jira/browse/YARN-3604) | removeApplication in ZKRMStateStore should also disable watch. |  Minor | resourcemanager | zhihai xu | zhihai xu |
| [YARN-3476](https://issues.apache.org/jira/browse/YARN-3476) | Nodemanager can fail to delete local logs if log aggregation fails |  Major | log-aggregation, nodemanager | Jason Lowe | Rohith Sharma K S |
| [YARN-3473](https://issues.apache.org/jira/browse/YARN-3473) | Fix RM Web UI configuration for some properties |  Minor | resourcemanager | Ray Chiang | Ray Chiang |
| [HDFS-8097](https://issues.apache.org/jira/browse/HDFS-8097) | TestFileTruncate is failing intermittently |  Major | test | Rakesh R | Rakesh R |
| [YARN-1912](https://issues.apache.org/jira/browse/YARN-1912) | ResourceLocalizer started without any jvm memory control |  Major | nodemanager | stanley shi | Masatake Iwasaki |
| [MAPREDUCE-6359](https://issues.apache.org/jira/browse/MAPREDUCE-6359) | RM HA setup, "Cluster" tab links populated with AM hostname instead of RM |  Minor | . | Aroop Maliakkal | yunjiong zhao |
| [MAPREDUCE-6353](https://issues.apache.org/jira/browse/MAPREDUCE-6353) | Divide by zero error in MR AM when calculating available containers |  Major | mr-am | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-3395](https://issues.apache.org/jira/browse/YARN-3395) | FairScheduler: Trim whitespaces when using username for queuename |  Major | fairscheduler | zhihai xu | zhihai xu |
| [HDFS-8351](https://issues.apache.org/jira/browse/HDFS-8351) | Remove namenode -finalize option from document |  Major | documentation | Akira Ajisaka | Akira Ajisaka |
| [YARN-3587](https://issues.apache.org/jira/browse/YARN-3587) | Fix the javadoc of DelegationTokenSecretManager in projects of yarn, etc. |  Minor | documentation | Akira Ajisaka | Gabor Liptak |
| [HADOOP-11663](https://issues.apache.org/jira/browse/HADOOP-11663) | Remove description about Java 6 from docs |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-11928](https://issues.apache.org/jira/browse/HADOOP-11928) | Test-patch check for @author tags incorrectly flags removal of @author tags |  Major | . | Sean Busbey | Kengo Seki |
| [HADOOP-11951](https://issues.apache.org/jira/browse/HADOOP-11951) | test-patch should give better info about failures to handle dev-support updates without resetrepo option |  Minor | . | Sean Busbey | Sean Busbey |
| [HADOOP-11947](https://issues.apache.org/jira/browse/HADOOP-11947) | test-patch should return early from determine-issue  when run in jenkins mode. |  Minor | . | Sean Busbey | Sean Busbey |
| [HDFS-7916](https://issues.apache.org/jira/browse/HDFS-7916) | 'reportBadBlocks' from datanodes to standby Node BPServiceActor goes for infinite loop |  Critical | datanode | Vinayakumar B | Rushabh S Shah |
| [YARN-3434](https://issues.apache.org/jira/browse/YARN-3434) | Interaction between reservations and userlimit can result in significant ULF violation |  Major | capacityscheduler | Thomas Graves | Thomas Graves |
| [HDFS-8362](https://issues.apache.org/jira/browse/HDFS-8362) | Java Compilation Error in TestHdfsConfigFields.java |  Major | . | Mohammad Arshad | Mohammad Arshad |
| [MAPREDUCE-6360](https://issues.apache.org/jira/browse/MAPREDUCE-6360) | TestMapreduceConfigFields is placed in wrong dir, introducing compile error |  Major | . | Vinayakumar B | Mohammad Arshad |
| [MAPREDUCE-6361](https://issues.apache.org/jira/browse/MAPREDUCE-6361) | NPE issue in shuffle caused by concurrent issue between copySucceeded() in one thread and copyFailed() in another thread on the same host |  Critical | . | Junping Du | Junping Du |
| [YARN-3629](https://issues.apache.org/jira/browse/YARN-3629) | NodeID is always printed as "null" in node manager initialization log. |  Major | . | nijel | nijel |
| [MAPREDUCE-6251](https://issues.apache.org/jira/browse/MAPREDUCE-6251) | JobClient needs additional retries at a higher level to address not-immediately-consistent dfs corner cases |  Major | jobhistoryserver, mrv2 | Craig Welch | Craig Welch |
| [MAPREDUCE-6366](https://issues.apache.org/jira/browse/MAPREDUCE-6366) | mapreduce.terasort.final.sync configuration in TeraSort  doesn't work |  Trivial | examples | Takuya Fukudome | Takuya Fukudome |
| [HDFS-6300](https://issues.apache.org/jira/browse/HDFS-6300) | Prevent multiple balancers from running simultaneously |  Critical | balancer & mover | Rakesh R | Rakesh R |
| [HDFS-8358](https://issues.apache.org/jira/browse/HDFS-8358) | TestTraceAdmin fails |  Major | . | Kihwal Lee | Masatake Iwasaki |
| [HADOOP-11966](https://issues.apache.org/jira/browse/HADOOP-11966) | Variable cygwin is undefined in hadoop-config.sh when executed through hadoop-daemon.sh. |  Critical | scripts | Chris Nauroth | Chris Nauroth |
| [HDFS-8380](https://issues.apache.org/jira/browse/HDFS-8380) | Always call addStoredBlock on blocks which have been shifted from one storage to another |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HADOOP-8174](https://issues.apache.org/jira/browse/HADOOP-8174) | Remove confusing comment in Path#isAbsolute() |  Trivial | fs | Suresh Srinivas | Suresh Srinivas |
| [HDFS-8150](https://issues.apache.org/jira/browse/HDFS-8150) | Make getFileChecksum fail for blocks under construction |  Critical | . | Kihwal Lee | J.Andreina |
| [MAPREDUCE-5708](https://issues.apache.org/jira/browse/MAPREDUCE-5708) | Duplicate String.format in YarnOutputFiles.getSpillFileForWrite |  Minor | . | Konstantin Weitz | Konstantin Weitz |
| [YARN-1519](https://issues.apache.org/jira/browse/YARN-1519) | check if sysconf is implemented before using it |  Major | nodemanager | Radim Kolar | Radim Kolar |
| [HDFS-8371](https://issues.apache.org/jira/browse/HDFS-8371) | Fix test failure in TestHdfsConfigFields for spanreceiver properties |  Major | . | Ray Chiang | Ray Chiang |
| [MAPREDUCE-6273](https://issues.apache.org/jira/browse/MAPREDUCE-6273) | HistoryFileManager should check whether summaryFile exists to avoid FileNotFoundException causing HistoryFileInfo into MOVE\_FAILED state |  Minor | jobhistoryserver | zhihai xu | zhihai xu |
| [YARN-2421](https://issues.apache.org/jira/browse/YARN-2421) | RM still allocates containers to an app in the FINISHING state |  Major | scheduler | Thomas Graves | Chang Li |
| [YARN-3526](https://issues.apache.org/jira/browse/YARN-3526) | ApplicationMaster tracking URL is incorrectly redirected on a QJM cluster |  Major | resourcemanager, webapp | Weiwei Yang | Weiwei Yang |
| [HADOOP-11988](https://issues.apache.org/jira/browse/HADOOP-11988) | Fix typo in the document for hadoop fs -find |  Trivial | documentation | Akira Ajisaka | Kengo Seki |
| [HADOOP-10582](https://issues.apache.org/jira/browse/HADOOP-10582) | Fix the test case for copying to non-existent dir in TestFsShellCopy |  Minor | fs | Kousuke Saruta | Kousuke Saruta |
| [HDFS-8345](https://issues.apache.org/jira/browse/HDFS-8345) | Storage policy APIs must be exposed via the FileSystem interface |  Major | hdfs-client | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8405](https://issues.apache.org/jira/browse/HDFS-8405) | Fix a typo in NamenodeFsck |  Minor | namenode | Tsz Wo Nicholas Sze | Takanobu Asanuma |
| [HDFS-6348](https://issues.apache.org/jira/browse/HDFS-6348) | SecondaryNameNode not terminating properly on runtime exceptions |  Major | namenode | Rakesh R | Rakesh R |
| [YARN-3601](https://issues.apache.org/jira/browse/YARN-3601) | Fix UT TestRMFailover.testRMWebAppRedirect |  Critical | resourcemanager, webapp | Weiwei Yang | Weiwei Yang |
| [HDFS-8404](https://issues.apache.org/jira/browse/HDFS-8404) | Pending block replication can get stuck using older genstamp |  Major | namenode | Nathan Roberts | Nathan Roberts |
| [HADOOP-11973](https://issues.apache.org/jira/browse/HADOOP-11973) | Ensure ZkDelegationTokenSecretManager namespace znodes get created with ACLs |  Major | security | Gregory Chanan | Gregory Chanan |
| [HADOOP-11963](https://issues.apache.org/jira/browse/HADOOP-11963) | Metrics documentation for FSNamesystem misspells PendingDataNodeMessageCount. |  Trivial | documentation | Chris Nauroth | Anu Engineer |
| [YARN-2821](https://issues.apache.org/jira/browse/YARN-2821) | Distributed shell app master becomes unresponsive sometimes |  Major | applications/distributed-shell | Varun Vasudev | Varun Vasudev |
| [YARN-3677](https://issues.apache.org/jira/browse/YARN-3677) | Fix findbugs warnings in yarn-server-resourcemanager |  Minor | resourcemanager | Akira Ajisaka | Vinod Kumar Vavilapalli |
| [YARN-3681](https://issues.apache.org/jira/browse/YARN-3681) | yarn cmd says "could not find main class 'queue'" in windows |  Blocker | yarn | Sumana Sathish | Varun Saxena |
| [YARN-3654](https://issues.apache.org/jira/browse/YARN-3654) | ContainerLogsPage web UI should not have meta-refresh |  Major | yarn | Xuan Gong | Xuan Gong |
| [YARN-3694](https://issues.apache.org/jira/browse/YARN-3694) | Fix dead link for TimelineServer REST API |  Minor | documentation | Akira Ajisaka | Jagadesh Kiran N |
| [YARN-3646](https://issues.apache.org/jira/browse/YARN-3646) | Applications are getting stuck some times in case of retry policy forever |  Major | client | Raju Bairishetti | Raju Bairishetti |
| [HDFS-8421](https://issues.apache.org/jira/browse/HDFS-8421) | Move startFile() and related operations into FSDirWriteFileOp |  Major | . | Haohui Mai | Haohui Mai |
| [HDFS-8451](https://issues.apache.org/jira/browse/HDFS-8451) | DFSClient probe for encryption testing interprets empty URI property for "enabled" |  Blocker | encryption | Steve Loughran | Steve Loughran |
| [YARN-3675](https://issues.apache.org/jira/browse/YARN-3675) | FairScheduler: RM quits when node removal races with continousscheduling on the same node |  Critical | fairscheduler | Anubhav Dhoot | Anubhav Dhoot |
| [HADOOP-12014](https://issues.apache.org/jira/browse/HADOOP-12014) | hadoop-config.cmd displays a wrong error message |  Minor | scripts | Kengo Seki | Kengo Seki |
| [HADOOP-11955](https://issues.apache.org/jira/browse/HADOOP-11955) | Fix a typo in the cluster setup doc |  Trivial | . | Kihwal Lee | Yanjun Wang |
| [HDFS-8268](https://issues.apache.org/jira/browse/HDFS-8268) | Port conflict log for data node server is not sufficient |  Minor | datanode | Mohammad Shahid Khan | Mohammad Shahid Khan |
| [YARN-3594](https://issues.apache.org/jira/browse/YARN-3594) | WintuilsProcessStubExecutor.startStreamReader leaks streams |  Trivial | nodemanager | Steve Loughran | Lars Francke |
| [HADOOP-11743](https://issues.apache.org/jira/browse/HADOOP-11743) | maven doesn't clean all the site files |  Minor | documentation | Allen Wittenauer | ramtin |
| [HADOOP-11927](https://issues.apache.org/jira/browse/HADOOP-11927) | Fix "undefined reference to dlopen" error when compiling libhadooppipes |  Major | build, native, tools | Xianyin Xin | Xianyin Xin |
| [YARN-3701](https://issues.apache.org/jira/browse/YARN-3701) | Isolating the error of generating a single app report when getting all apps from generic history service |  Blocker | timelineserver | Zhijie Shen | Zhijie Shen |
| [YARN-3707](https://issues.apache.org/jira/browse/YARN-3707) | RM Web UI queue filter doesn't work |  Blocker | . | Wangda Tan | Wangda Tan |
| [YARN-2238](https://issues.apache.org/jira/browse/YARN-2238) | filtering on UI sticks even if I move away from the page |  Major | webapp | Sangjin Lee | Jian He |
| [HADOOP-8751](https://issues.apache.org/jira/browse/HADOOP-8751) | NPE in Token.toString() when Token is constructed using null identifier |  Minor | security | Vlad Rozov | Kanaka Kumar Avvaru |
| [HADOOP-11969](https://issues.apache.org/jira/browse/HADOOP-11969) | ThreadLocal initialization in several classes is not thread safe |  Critical | io | Sean Busbey | Sean Busbey |
| [YARN-3626](https://issues.apache.org/jira/browse/YARN-3626) | On Windows localized resources are not moved to the front of the classpath when they should be |  Major | yarn | Craig Welch | Craig Welch |
| [HADOOP-9891](https://issues.apache.org/jira/browse/HADOOP-9891) | CLIMiniCluster instructions fail with MiniYarnCluster ClassNotFoundException |  Minor | documentation | Steve Loughran | Darrell Taylor |
| [HDFS-8431](https://issues.apache.org/jira/browse/HDFS-8431) | hdfs crypto class not found in Windows |  Critical | scripts | Sumana Sathish | Anu Engineer |
| [HADOOP-12004](https://issues.apache.org/jira/browse/HADOOP-12004) | test-patch breaks with reexec in certain situations |  Critical | . | Allen Wittenauer | Sean Busbey |
| [YARN-3723](https://issues.apache.org/jira/browse/YARN-3723) | Need to clearly document primaryFilter and otherInfo value type |  Critical | timelineserver | Zhijie Shen | Zhijie Shen |
| [HDFS-8407](https://issues.apache.org/jira/browse/HDFS-8407) | libhdfs hdfsListDirectory must set errno to 0 on success |  Major | native | Juan Yu | Masatake Iwasaki |
| [HDFS-8429](https://issues.apache.org/jira/browse/HDFS-8429) | Avoid stuck threads if there is an error in DomainSocketWatcher that stops the thread |  Major | . | zhouyingchao | zhouyingchao |
| [HADOOP-11959](https://issues.apache.org/jira/browse/HADOOP-11959) | WASB should configure client side socket timeout in storage client blob request options |  Major | tools | Ivan Mitic | Ivan Mitic |
| [HADOOP-11934](https://issues.apache.org/jira/browse/HADOOP-11934) | Use of JavaKeyStoreProvider in LdapGroupsMapping causes infinite loop |  Blocker | security | Mike Yoder | Larry McCay |
| [HDFS-7401](https://issues.apache.org/jira/browse/HDFS-7401) | Add block info to DFSInputStream' WARN message when it adds node to deadNodes |  Minor | . | Ming Ma | Mohammad Arshad |
| [HADOOP-12042](https://issues.apache.org/jira/browse/HADOOP-12042) | Users may see TrashPolicy if hdfs dfs -rm is run |  Major | . | Allen Wittenauer | J.Andreina |
| [HDFS-7609](https://issues.apache.org/jira/browse/HDFS-7609) | Avoid retry cache collision when Standby NameNode loading edits |  Critical | namenode | Carrey Zhan | Ming Ma |
| [HADOOP-11885](https://issues.apache.org/jira/browse/HADOOP-11885) | hadoop-dist dist-layout-stitching.sh does not work with dash |  Major | build | Andrew Wang | Andrew Wang |
| [YARN-3725](https://issues.apache.org/jira/browse/YARN-3725) | App submission via REST API is broken in secure mode due to Timeline DT service address is empty |  Blocker | resourcemanager, timelineserver | Zhijie Shen | Zhijie Shen |
| [HADOOP-12037](https://issues.apache.org/jira/browse/HADOOP-12037) | Fix wrong classname in example configuration of hadoop-auth documentation |  Trivial | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8256](https://issues.apache.org/jira/browse/HDFS-8256) | fsck "-storagepolicies , -blockId ,-replicaDetails " options are missed out in usage and from documentation |  Major | documentation | J.Andreina | J.Andreina |
| [HDFS-8486](https://issues.apache.org/jira/browse/HDFS-8486) | DN startup may cause severe data loss |  Blocker | datanode | Daryn Sharp | Daryn Sharp |
| [HDFS-8386](https://issues.apache.org/jira/browse/HDFS-8386) | Improve synchronization of 'streamer' reference in DFSOutputStream |  Major | hdfs-client | Rakesh R | Rakesh R |
| [HDFS-8513](https://issues.apache.org/jira/browse/HDFS-8513) | Rename BlockPlacementPolicyRackFaultTolarent to BlockPlacementPolicyRackFaultTolerant |  Minor | namenode | Andrew Wang | Andrew Wang |
| [HADOOP-11991](https://issues.apache.org/jira/browse/HADOOP-11991) | test-patch.sh isn't re-executed even if smart-apply-patch.sh is modified |  Major | test | Kengo Seki | Kengo Seki |
| [HDFS-8270](https://issues.apache.org/jira/browse/HDFS-8270) | create() always retried with hardcoded timeout when file already exists with open lease |  Major | hdfs-client | Andrey Stepachev | J.Andreina |
| [HDFS-8470](https://issues.apache.org/jira/browse/HDFS-8470) | fsimage loading progress should update inode, delegation token and cache pool count. |  Minor | namenode | tongshiquan | Surendra Singh Lilhore |
| [HDFS-8523](https://issues.apache.org/jira/browse/HDFS-8523) | Remove usage information on unsupported operation "fsck -showprogress" from branch-2 |  Major | documentation | J.Andreina | J.Andreina |
| [HDFS-3716](https://issues.apache.org/jira/browse/HDFS-3716) | Purger should remove stale fsimage ckpt files |  Minor | namenode | suja s | J.Andreina |
| [YARN-3751](https://issues.apache.org/jira/browse/YARN-3751) | TestAHSWebServices fails after YARN-3467 |  Major | . | Zhijie Shen | Sunil G |
| [YARN-3585](https://issues.apache.org/jira/browse/YARN-3585) | NodeManager cannot exit on SHUTDOWN event triggered and NM recovery is enabled |  Critical | . | Peng Zhang | Rohith Sharma K S |
| [MAPREDUCE-6374](https://issues.apache.org/jira/browse/MAPREDUCE-6374) | Distributed Cache File visibility should check permission of full path |  Major | . | Chang Li | Chang Li |
| [YARN-3762](https://issues.apache.org/jira/browse/YARN-3762) | FairScheduler: CME on FSParentQueue#getQueueUserAclInfo |  Critical | fairscheduler | Karthik Kambatla | Karthik Kambatla |
| [YARN-3749](https://issues.apache.org/jira/browse/YARN-3749) | We should make a copy of configuration when init MiniYARNCluster with multiple RMs |  Major | . | Chun Chen | Chun Chen |
| [MAPREDUCE-5965](https://issues.apache.org/jira/browse/MAPREDUCE-5965) | Hadoop streaming throws error if list of input files is high. Error is: "error=7, Argument list too long at if number of input file is high" |  Major | . | Arup Malakar | Wilfred Spiegelenburg |
| [HADOOP-12018](https://issues.apache.org/jira/browse/HADOOP-12018) | smart-apply-patch.sh fails if the patch edits CR+LF files and is created by 'git diff --no-prefix' |  Minor | build | Akira Ajisaka | Kengo Seki |
| [HADOOP-12019](https://issues.apache.org/jira/browse/HADOOP-12019) | update BUILDING.txt to include python for 'mvn site' in windows |  Major | . | Vinayakumar B | Vinayakumar B |
| [MAPREDUCE-6382](https://issues.apache.org/jira/browse/MAPREDUCE-6382) | Don't escape HTML links in Diagnostics in JHS job overview |  Major | . | Siqi Li | Siqi Li |
| [HADOOP-12058](https://issues.apache.org/jira/browse/HADOOP-12058) | Fix dead links to DistCp and Hadoop Archives pages. |  Minor | documentation, site | Kazuho Fujii | Kazuho Fujii |
| [HDFS-8463](https://issues.apache.org/jira/browse/HDFS-8463) | Calling DFSInputStream.seekToNewSource just after stream creation causes  NullPointerException |  Minor | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3764](https://issues.apache.org/jira/browse/YARN-3764) | CapacityScheduler should forbid moving LeafQueue from one parent to another |  Blocker | . | Wangda Tan | Wangda Tan |
| [HADOOP-11994](https://issues.apache.org/jira/browse/HADOOP-11994) | smart-apply-patch wrongly assumes that git is infallible |  Major | test | Allen Wittenauer | Kengo Seki |
| [HADOOP-11924](https://issues.apache.org/jira/browse/HADOOP-11924) | Tolerate JDK-8047340-related exceptions in Shell#isSetSidAvailable preventing class init |  Major | . | Gera Shegalov | Tsuyoshi Ozawa |
| [YARN-3733](https://issues.apache.org/jira/browse/YARN-3733) | Fix DominantRC#compare() does not work as expected if cluster resource is empty |  Blocker | resourcemanager | Bibin A Chundatt | Rohith Sharma K S |
| [MAPREDUCE-6377](https://issues.apache.org/jira/browse/MAPREDUCE-6377) | JHS sorting on state column not working in webUi |  Minor | jobhistoryserver | Bibin A Chundatt | zhihai xu |
| [MAPREDUCE-6387](https://issues.apache.org/jira/browse/MAPREDUCE-6387) | Serialize the recently added Task#encryptedSpillKey field at the end |  Minor | . | Arun Suresh | Arun Suresh |
| [HADOOP-12056](https://issues.apache.org/jira/browse/HADOOP-12056) | Use DirectoryStream in DiskChecker#checkDirs to detect errors when listing a directory |  Major | util | zhihai xu | zhihai xu |
| [HDFS-8522](https://issues.apache.org/jira/browse/HDFS-8522) | Change heavily recorded NN logs from INFO to DEBUG level |  Major | namenode | Xiaoyu Yao | Xiaoyu Yao |
| [YARN-3655](https://issues.apache.org/jira/browse/YARN-3655) | FairScheduler: potential livelock due to maxAMShare limitation and container reservation |  Critical | fairscheduler | zhihai xu | zhihai xu |
| [HDFS-8539](https://issues.apache.org/jira/browse/HDFS-8539) | Hdfs doesnt have class 'debug' in windows |  Major | scripts | Sumana Sathish | Anu Engineer |
| [YARN-3780](https://issues.apache.org/jira/browse/YARN-3780) | Should use equals when compare Resource in RMNodeImpl#ReconnectNodeTransition |  Minor | resourcemanager | zhihai xu | zhihai xu |
| [YARN-3747](https://issues.apache.org/jira/browse/YARN-3747) | TestLocalDirsHandlerService should delete the created test directory logDir2 |  Minor | test | David Moore | David Moore |
| [HDFS-8554](https://issues.apache.org/jira/browse/HDFS-8554) | TestDatanodeLayoutUpgrade fails on Windows. |  Major | test | Chris Nauroth | Chris Nauroth |
| [YARN-3778](https://issues.apache.org/jira/browse/YARN-3778) | Fix Yarn resourcemanger CLI usage |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12054](https://issues.apache.org/jira/browse/HADOOP-12054) | RPC client should not retry for InvalidToken exceptions |  Critical | ipc | Daryn Sharp | Varun Saxena |
| [HDFS-8552](https://issues.apache.org/jira/browse/HDFS-8552) | Fix hdfs CLI usage message for namenode and zkfc |  Major | . | Xiaoyu Yao | Brahma Reddy Battula |
| [HADOOP-12073](https://issues.apache.org/jira/browse/HADOOP-12073) | Azure FileSystem PageBlobInputStream does not return -1 on EOF |  Major | tools | Ivan Mitic | Ivan Mitic |
| [HDFS-8568](https://issues.apache.org/jira/browse/HDFS-8568) | TestClusterId#testFormatWithEmptyClusterIdOption is failing |  Major | . | Rakesh R | Rakesh R |
| [HADOOP-7817](https://issues.apache.org/jira/browse/HADOOP-7817) | RawLocalFileSystem.append() should give FSDataOutputStream with accurate .getPos() |  Major | fs | Kristofer Tomasette | Kanaka Kumar Avvaru |
| [MAPREDUCE-6350](https://issues.apache.org/jira/browse/MAPREDUCE-6350) | JobHistory doesn't support fully-functional search |  Critical | jobhistoryserver | Siqi Li | Siqi Li |
| [MAPREDUCE-6389](https://issues.apache.org/jira/browse/MAPREDUCE-6389) | Fix BaileyBorweinPlouffe CLI usage message |  Trivial | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12052](https://issues.apache.org/jira/browse/HADOOP-12052) | IPC client downgrades all exception types to IOE, breaks callers trying to use them |  Critical | . | Steve Loughran | Brahma Reddy Battula |
| [YARN-3785](https://issues.apache.org/jira/browse/YARN-3785) | Support for Resource as an argument during submitApp call in MockRM test class |  Minor | resourcemanager | Sunil G | Sunil G |
| [HADOOP-12074](https://issues.apache.org/jira/browse/HADOOP-12074) | in Shell.java#runCommand() rethrow InterruptedException as InterruptedIOException |  Minor | . | Lavkesh Lahngir | Lavkesh Lahngir |
| [HDFS-8566](https://issues.apache.org/jira/browse/HDFS-8566) | HDFS documentation about debug commands wrongly identifies them as "hdfs dfs" commands |  Major | documentation | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-8583](https://issues.apache.org/jira/browse/HDFS-8583) | Document that NFS gateway does not work with rpcbind on SLES 11 |  Major | documentation | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8572](https://issues.apache.org/jira/browse/HDFS-8572) | DN always uses HTTP/localhost@REALM principals in SPNEGO |  Blocker | . | Haohui Mai | Haohui Mai |
| [YARN-3794](https://issues.apache.org/jira/browse/YARN-3794) | TestRMEmbeddedElector fails because of ambiguous LOG reference |  Major | test | Chengbing Liu | Chengbing Liu |
| [HDFS-8593](https://issues.apache.org/jira/browse/HDFS-8593) | Calculation of effective layout version mishandles comparison to current layout version in storage. |  Major | namenode | Chris Nauroth | Chris Nauroth |
| [HDFS-8596](https://issues.apache.org/jira/browse/HDFS-8596) | TestDistributedFileSystem et al tests are broken in branch-2 due to incorrect setting of "datanode" attribute |  Blocker | datanode | Yongjun Zhang | Yongjun Zhang |
| [HDFS-8595](https://issues.apache.org/jira/browse/HDFS-8595) | TestCommitBlockSynchronization fails in branch-2.7 |  Major | test | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8607](https://issues.apache.org/jira/browse/HDFS-8607) | TestFileCorruption doesn't work as expected |  Major | test | Walter Su | Walter Su |
| [HADOOP-12001](https://issues.apache.org/jira/browse/HADOOP-12001) | Limiting LDAP search conflicts with posixGroup addition |  Blocker | security | Patrick White | Patrick White |
| [HADOOP-12078](https://issues.apache.org/jira/browse/HADOOP-12078) | The default retry policy does not handle RetriableException correctly |  Critical | ipc | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8576](https://issues.apache.org/jira/browse/HDFS-8576) |  Lease recovery should return true if the lease can be released and the file can be closed |  Major | namenode | J.Andreina | J.Andreina |
| [HDFS-8592](https://issues.apache.org/jira/browse/HDFS-8592) | SafeModeException never get unwrapped |  Major | . | Haohui Mai | Haohui Mai |
| [HADOOP-12095](https://issues.apache.org/jira/browse/HADOOP-12095) | org.apache.hadoop.fs.shell.TestCount fails |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-4660](https://issues.apache.org/jira/browse/HDFS-4660) | Block corruption can happen during pipeline recovery |  Blocker | datanode | Peng Zhang | Kihwal Lee |
| [HDFS-8548](https://issues.apache.org/jira/browse/HDFS-8548) | Minicluster throws NPE on shutdown |  Major | . | Mike Drob | Surendra Singh Lilhore |
| [YARN-3714](https://issues.apache.org/jira/browse/YARN-3714) | AM proxy filter can not get RM webapp address from yarn.resourcemanager.hostname.rm-id |  Minor | . | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8551](https://issues.apache.org/jira/browse/HDFS-8551) | Fix hdfs datanode CLI usage message |  Major | . | Xiaoyu Yao | Brahma Reddy Battula |
| [HADOOP-12076](https://issues.apache.org/jira/browse/HADOOP-12076) | Incomplete Cache Mechanism in CredentialProvider API |  Major | security | Larry McCay | Larry McCay |
| [YARN-3617](https://issues.apache.org/jira/browse/YARN-3617) | Fix WindowsResourceCalculatorPlugin.getCpuFrequency() returning always -1 |  Minor | . | Georg Berendt | J.Andreina |
| [YARN-3804](https://issues.apache.org/jira/browse/YARN-3804) | Both RM are on standBy state when kerberos user not in yarn.admin.acl |  Critical | resourcemanager | Bibin A Chundatt | Varun Saxena |
| [HDFS-8446](https://issues.apache.org/jira/browse/HDFS-8446) | Separate safemode related operations in GetBlockLocations() |  Minor | . | Haohui Mai | Haohui Mai |
| [HDFS-8615](https://issues.apache.org/jira/browse/HDFS-8615) | Correct HTTP method in WebHDFS document |  Major | documentation | Akira Ajisaka | Brahma Reddy Battula |
| [MAPREDUCE-6373](https://issues.apache.org/jira/browse/MAPREDUCE-6373) | The logger reports total input paths but it is referring to input files |  Trivial | . | Andi Chirita Amdocs | Bibin A Chundatt |
| [YARN-3824](https://issues.apache.org/jira/browse/YARN-3824) | Fix two minor nits in member variable properties of YarnConfiguration |  Trivial | yarn | Ray Chiang | Ray Chiang |
| [HADOOP-12100](https://issues.apache.org/jira/browse/HADOOP-12100) | ImmutableFsPermission should not override applyUmask since that method doesn't modify the FsPermission |  Major | . | Robert Kanter | Bibin A Chundatt |
| [YARN-3802](https://issues.apache.org/jira/browse/YARN-3802) | Two RMNodes for the same NodeId are used in RM sometimes after NM is reconnected. |  Major | resourcemanager | zhihai xu | zhihai xu |
| [HDFS-8633](https://issues.apache.org/jira/browse/HDFS-8633) | Fix setting of dfs.datanode.readahead.bytes in hdfs-default.xml to match DFSConfigKeys |  Minor | datanode | Ray Chiang | Ray Chiang |
| [HDFS-8626](https://issues.apache.org/jira/browse/HDFS-8626) | Reserved RBW space is not released if creation of RBW File fails |  Blocker | . | Kanaka Kumar Avvaru | Kanaka Kumar Avvaru |
| [MAPREDUCE-6405](https://issues.apache.org/jira/browse/MAPREDUCE-6405) | NullPointerException in App Attempts page |  Major | . | Siqi Li | Siqi Li |
| [HADOOP-12103](https://issues.apache.org/jira/browse/HADOOP-12103) | Small refactoring of DelegationTokenAuthenticationFilter to allow code sharing |  Minor | security | Yongjun Zhang | Yongjun Zhang |
| [HDFS-8337](https://issues.apache.org/jira/browse/HDFS-8337) | Accessing httpfs via webhdfs doesn't work from a jar with kerberos |  Major | security, webhdfs | Yongjun Zhang | Yongjun Zhang |
| [MAPREDUCE-6403](https://issues.apache.org/jira/browse/MAPREDUCE-6403) | Fix typo in the usage of NNBench |  Trivial | documentation | Akira Ajisaka | Jagadesh Kiran N |
| [HDFS-8480](https://issues.apache.org/jira/browse/HDFS-8480) | Fix performance and timeout issues in HDFS-7929 by using hard-links to preserve old edit logs instead of copying them |  Critical | . | Zhe Zhang | Zhe Zhang |
| [MAPREDUCE-5948](https://issues.apache.org/jira/browse/MAPREDUCE-5948) | org.apache.hadoop.mapred.LineRecordReader does not handle multibyte record delimiters well |  Critical | . | Kris Geusebroek | Akira Ajisaka |
| [HDFS-8542](https://issues.apache.org/jira/browse/HDFS-8542) | WebHDFS getHomeDirectory behavior does not match specification |  Major | webhdfs | Jakob Homan | Kanaka Kumar Avvaru |
| [YARN-3842](https://issues.apache.org/jira/browse/YARN-3842) | NMProxy should retry on NMNotYetReadyException |  Critical | . | Karthik Kambatla | Robert Kanter |
| [YARN-3835](https://issues.apache.org/jira/browse/YARN-3835) | hadoop-yarn-server-resourcemanager test package bundles core-site.xml, yarn-site.xml |  Minor | resourcemanager | Vamsee Yarlagadda | Vamsee Yarlagadda |
| [MAPREDUCE-6410](https://issues.apache.org/jira/browse/MAPREDUCE-6410) | Aggregated Logs Deletion doesnt work after refreshing Log Retention Settings in secure cluster |  Critical | . | Zhang Wei | Varun Saxena |
| [MAPREDUCE-6400](https://issues.apache.org/jira/browse/MAPREDUCE-6400) | Multiple shuffle transfer fails because input is closed too early |  Blocker | task | Akira Ajisaka | Brahma Reddy Battula |
| [YARN-3809](https://issues.apache.org/jira/browse/YARN-3809) | Failed to launch new attempts because ApplicationMasterLauncher's threads all hang |  Major | resourcemanager | Jun Gong | Jun Gong |
| [YARN-3832](https://issues.apache.org/jira/browse/YARN-3832) | Resource Localization fails on a cluster due to existing cache directories |  Critical | nodemanager | Ranga Swamy | Brahma Reddy Battula |
| [YARN-3790](https://issues.apache.org/jira/browse/YARN-3790) | usedResource from rootQueue metrics may get stale data for FS scheduler after recovering the container |  Major | fairscheduler, test | Rohith Sharma K S | zhihai xu |
| [HADOOP-11958](https://issues.apache.org/jira/browse/HADOOP-11958) | MetricsSystemImpl fails to show backtrace when an error occurs |  Major | . | Jason Lowe | Jason Lowe |
| [HDFS-8646](https://issues.apache.org/jira/browse/HDFS-8646) | Prune cached replicas from DatanodeDescriptor state on replica invalidation |  Major | caching | Andrew Wang | Andrew Wang |
| [YARN-3826](https://issues.apache.org/jira/browse/YARN-3826) | Race condition in ResourceTrackerService leads to wrong diagnostics messages |  Major | resourcemanager | Chengbing Liu | Chengbing Liu |
| [YARN-3745](https://issues.apache.org/jira/browse/YARN-3745) | SerializedException should also try to instantiate internal exception with the default constructor |  Major | . | Lavkesh Lahngir | Lavkesh Lahngir |
| [MAPREDUCE-6413](https://issues.apache.org/jira/browse/MAPREDUCE-6413) | TestLocalJobSubmission is failing with unknown host |  Major | test | Jason Lowe | zhihai xu |
| [HDFS-8665](https://issues.apache.org/jira/browse/HDFS-8665) | Fix replication check in DFSTestUtils#waitForReplication |  Trivial | test | Andrew Wang | Andrew Wang |
| [HADOOP-8151](https://issues.apache.org/jira/browse/HADOOP-8151) | Error handling in snappy decompressor throws invalid exceptions |  Major | io, native | Todd Lipcon | Matt Foley |
| [YARN-3850](https://issues.apache.org/jira/browse/YARN-3850) | NM fails to read files from full disks which can lead to container logs being lost and other issues |  Blocker | log-aggregation, nodemanager | Varun Saxena | Varun Saxena |
| [HDFS-8656](https://issues.apache.org/jira/browse/HDFS-8656) | Preserve compatibility of ClientProtocol#rollingUpgrade after finalization |  Critical | rolling upgrades | Andrew Wang | Andrew Wang |
| [YARN-3859](https://issues.apache.org/jira/browse/YARN-3859) | LeafQueue doesn't print user properly for application add |  Minor | capacityscheduler | Devaraj K | Varun Saxena |
| [HDFS-8681](https://issues.apache.org/jira/browse/HDFS-8681) | BlockScanner is incorrectly disabled by default |  Blocker | datanode | Andrew Wang | Arpit Agarwal |
| [YARN-3860](https://issues.apache.org/jira/browse/YARN-3860) | rmadmin -transitionToActive should check the state of non-target node |  Major | resourcemanager | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8586](https://issues.apache.org/jira/browse/HDFS-8586) | Dead Datanode is allocated for write when client is  from deadnode |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12119](https://issues.apache.org/jira/browse/HADOOP-12119) | hadoop fs -expunge does not work for federated namespace |  Major | . | Vrushali C | J.Andreina |
| [HDFS-8628](https://issues.apache.org/jira/browse/HDFS-8628) | Update missing command option for fetchdt |  Major | documentation | J.Andreina | J.Andreina |
| [YARN-3695](https://issues.apache.org/jira/browse/YARN-3695) | ServerProxy (NMProxy, etc.) shouldn't retry forever for non network exception. |  Major | . | Junping Du | Raju Bairishetti |
| [HADOOP-12089](https://issues.apache.org/jira/browse/HADOOP-12089) | StorageException complaining " no lease ID" when updating FolderLastModifiedTime in WASB |  Major | tools | Duo Xu | Duo Xu |
| [YARN-3770](https://issues.apache.org/jira/browse/YARN-3770) | SerializedException should also handle java.lang.Error |  Major | . | Lavkesh Lahngir | Lavkesh Lahngir |
| [HDFS-8687](https://issues.apache.org/jira/browse/HDFS-8687) | Remove the duplicate usage message from Dfsck.java |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12107](https://issues.apache.org/jira/browse/HADOOP-12107) | long running apps may have a huge number of StatisticsData instances under FileSystem |  Critical | fs | Sangjin Lee | Sangjin Lee |
| [HDFS-8579](https://issues.apache.org/jira/browse/HDFS-8579) | Update HDFS usage with missing options |  Minor | . | J.Andreina | J.Andreina |
| [HADOOP-12154](https://issues.apache.org/jira/browse/HADOOP-12154) | FileSystem#getUsed() returns the file length only from root '/' |  Major | . | tongshiquan | J.Andreina |
| [YARN-3768](https://issues.apache.org/jira/browse/YARN-3768) | ArrayIndexOutOfBoundsException with empty environment variables |  Major | yarn | Joe Ferner | zhihai xu |
| [HADOOP-10798](https://issues.apache.org/jira/browse/HADOOP-10798) | globStatus() should always return a sorted list of files |  Minor | . | Felix Borchers | Colin P. McCabe |
| [HADOOP-12124](https://issues.apache.org/jira/browse/HADOOP-12124) | Add HTrace support for FsShell |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HADOOP-12159](https://issues.apache.org/jira/browse/HADOOP-12159) | Move DistCpUtils#compareFs() to org.apache.hadoop.fs.FileUtil and fix for HA namespaces |  Major | . | Ray Chiang | Ray Chiang |
| [MAPREDUCE-6121](https://issues.apache.org/jira/browse/MAPREDUCE-6121) | JobResourceUpdater#compareFs() doesn't handle HA namespaces |  Major | mrv2 | Thomas Graves | Ray Chiang |
| [HADOOP-12116](https://issues.apache.org/jira/browse/HADOOP-12116) | Fix unrecommended syntax usages in hadoop/hdfs/yarn script for cygwin in branch-2 |  Major | scripts | Li Lu | Li Lu |
| [HADOOP-12164](https://issues.apache.org/jira/browse/HADOOP-12164) | Fix TestMove and TestFsShellReturnCode failed to get command name using reflection. |  Minor | . | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [YARN-3823](https://issues.apache.org/jira/browse/YARN-3823) | Fix mismatch in default values for yarn.scheduler.maximum-allocation-vcores property |  Minor | . | Ray Chiang | Ray Chiang |
| [YARN-3830](https://issues.apache.org/jira/browse/YARN-3830) | AbstractYarnScheduler.createReleaseCache may try to clean a null attempt |  Major | scheduler | nijel | nijel |
| [HDFS-8706](https://issues.apache.org/jira/browse/HDFS-8706) | Fix typo in datanode startup options in HDFSCommands.html |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6420](https://issues.apache.org/jira/browse/MAPREDUCE-6420) | Interrupted Exception in LocalContainerLauncher should be logged in warn/info level |  Major | . | Chang Li | Chang Li |
| [MAPREDUCE-6418](https://issues.apache.org/jira/browse/MAPREDUCE-6418) | MRApp should not shutdown LogManager during shutdown |  Major | test | Chang Li | Chang Li |
| [YARN-3793](https://issues.apache.org/jira/browse/YARN-3793) | Several NPEs when deleting local files on NM recovery |  Major | nodemanager | Karthik Kambatla | Varun Saxena |
| [HDFS-8666](https://issues.apache.org/jira/browse/HDFS-8666) | speedup TestMover |  Major | test | Walter Su | Walter Su |
| [HADOOP-12171](https://issues.apache.org/jira/browse/HADOOP-12171) | Shorten overly-long htrace span names for server |  Major | tracing | Colin P. McCabe | Colin P. McCabe |
| [YARN-3875](https://issues.apache.org/jira/browse/YARN-3875) | FSSchedulerNode#reserveResource() doesn't print Application Id properly in log |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3508](https://issues.apache.org/jira/browse/YARN-3508) | Prevent processing preemption events on the main RM dispatcher |  Major | resourcemanager, scheduler | Jason Lowe | Varun Saxena |
| [HADOOP-12173](https://issues.apache.org/jira/browse/HADOOP-12173) | NetworkTopology#add calls NetworkTopology#toString always |  Major | . | Inigo Goiri | Inigo Goiri |
| [HDFS-8577](https://issues.apache.org/jira/browse/HDFS-8577) | Avoid retrying to recover lease on a file which does not exist |  Major | . | J.Andreina | J.Andreina |
| [YARN-3882](https://issues.apache.org/jira/browse/YARN-3882) | AggregatedLogFormat should close aclScanner and ownerScanner after create them. |  Minor | nodemanager | zhihai xu | zhihai xu |
| [MAPREDUCE-6425](https://issues.apache.org/jira/browse/MAPREDUCE-6425) | ShuffleHandler passes wrong "base" parameter to getMapOutputInfo if mapId is not in the cache. |  Major | mrv2, nodemanager | zhihai xu | zhihai xu |
| [HADOOP-12186](https://issues.apache.org/jira/browse/HADOOP-12186) | ActiveStandbyElector shouldn't call monitorLockNodeAsync multiple times |  Major | ha | zhihai xu | zhihai xu |
| [HDFS-8686](https://issues.apache.org/jira/browse/HDFS-8686) | WebHdfsFileSystem#getXAttr(Path p, final String name) doesn't work if namespace is in capitals |  Major | webhdfs | Jagadesh Kiran N | Kanaka Kumar Avvaru |
| [YARN-3837](https://issues.apache.org/jira/browse/YARN-3837) | javadocs of TimelineAuthenticationFilterInitializer give wrong prefix for auth options |  Minor | timelineserver | Steve Loughran | Bibin A Chundatt |
| [HADOOP-12117](https://issues.apache.org/jira/browse/HADOOP-12117) | Potential NPE from Configuration#loadProperty with allowNullValueProperties set. |  Minor | conf | zhihai xu | zhihai xu |
| [MAPREDUCE-6038](https://issues.apache.org/jira/browse/MAPREDUCE-6038) | A boolean may be set error in the Word Count v2.0 in MapReduce Tutorial |  Minor | . | Pei Ma | Tsuyoshi Ozawa |
| [YARN-3892](https://issues.apache.org/jira/browse/YARN-3892) | NPE on RMStateStore#serviceStop when CapacityScheduler#serviceInit fails |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3690](https://issues.apache.org/jira/browse/YARN-3690) | [JDK8] 'mvn site' fails |  Major | api, site | Akira Ajisaka | Brahma Reddy Battula |
| [HADOOP-12202](https://issues.apache.org/jira/browse/HADOOP-12202) | releasedocmaker drops missing component and assignee entries |  Blocker | yetus | Allen Wittenauer | Allen Wittenauer |
| [HDFS-8642](https://issues.apache.org/jira/browse/HDFS-8642) | Make TestFileTruncate more reliable |  Minor | . | Rakesh R | Rakesh R |
| [HADOOP-11878](https://issues.apache.org/jira/browse/HADOOP-11878) | FileContext.java # fixRelativePart should check for not null for a more informative exception |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12201](https://issues.apache.org/jira/browse/HADOOP-12201) | Add tracing to FileSystem#createFileSystem and Globber#glob |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HADOOP-12200](https://issues.apache.org/jira/browse/HADOOP-12200) | TestCryptoStreamsWithOpensslAesCtrCryptoCodec should be skipped in non-native profile |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [MAPREDUCE-6426](https://issues.apache.org/jira/browse/MAPREDUCE-6426) | TestShuffleHandler#testGetMapOutputInfo is failing |  Major | test | Devaraj K | zhihai xu |
| [HDFS-8729](https://issues.apache.org/jira/browse/HDFS-8729) | Fix testTruncateWithDataNodesRestartImmediately occasionally failed |  Minor | . | Walter Su | Walter Su |
| [YARN-3888](https://issues.apache.org/jira/browse/YARN-3888) | ApplicationMaster link is broken in RM WebUI when appstate is NEW |  Minor | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-8749](https://issues.apache.org/jira/browse/HDFS-8749) | Fix findbugs warning in BlockManager.java |  Minor | . | Akira Ajisaka | Brahma Reddy Battula |
| [HDFS-2956](https://issues.apache.org/jira/browse/HDFS-2956) | calling fetchdt without a --renewer argument throws NPE |  Major | security | Todd Lipcon | Vinayakumar B |
| [HDFS-8751](https://issues.apache.org/jira/browse/HDFS-8751) | Remove setBlocks API from INodeFile and misc code cleanup |  Major | namenode | Zhe Zhang | Zhe Zhang |
| [YARN-3849](https://issues.apache.org/jira/browse/YARN-3849) | Too much of preemption activity causing continuos killing of containers across queues |  Critical | capacityscheduler | Sunil G | Sunil G |
| [YARN-3917](https://issues.apache.org/jira/browse/YARN-3917) | getResourceCalculatorPlugin for the default should intercept all exceptions |  Major | . | Gera Shegalov | Gera Shegalov |
| [YARN-3894](https://issues.apache.org/jira/browse/YARN-3894) | RM startup should fail for wrong CS xml NodeLabel capacity configuration |  Critical | capacityscheduler | Bibin A Chundatt | Bibin A Chundatt |
| [MAPREDUCE-6421](https://issues.apache.org/jira/browse/MAPREDUCE-6421) | Fix findbugs warning in RMContainerAllocator.reduceNodeLabelExpression |  Major | . | Ray Chiang | Brahma Reddy Battula |
| [HADOOP-12191](https://issues.apache.org/jira/browse/HADOOP-12191) | Bzip2Factory is not thread safe |  Major | io | Jason Lowe | Brahma Reddy Battula |
| [HDFS-7608](https://issues.apache.org/jira/browse/HDFS-7608) | hdfs dfsclient  newConnectedPeer has no write timeout |  Major | fuse-dfs, hdfs-client | zhangshilong | Xiaoyu Yao |
| [HADOOP-12153](https://issues.apache.org/jira/browse/HADOOP-12153) | ByteBufferReadable doesn't declare @InterfaceAudience and @InterfaceStability |  Minor | fs | Steve Loughran | Brahma Reddy Battula |
| [HDFS-8778](https://issues.apache.org/jira/browse/HDFS-8778) | TestBlockReportRateLimiting#testLeaseExpiration can deadlock |  Major | test | Arpit Agarwal | Arpit Agarwal |
| [HADOOP-10615](https://issues.apache.org/jira/browse/HADOOP-10615) | FileInputStream in JenkinsHash#main() is never closed |  Minor | . | Ted Yu | Chen He |
| [HADOOP-12240](https://issues.apache.org/jira/browse/HADOOP-12240) | Fix tests requiring native library to be skipped in non-native profile |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3805](https://issues.apache.org/jira/browse/YARN-3805) | Update the documentation of Disk Checker based on YARN-90 |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8767](https://issues.apache.org/jira/browse/HDFS-8767) | RawLocalFileSystem.listStatus() returns null for UNIX pipefile |  Critical | . | Haohui Mai | Kanaka Kumar Avvaru |
| [YARN-3885](https://issues.apache.org/jira/browse/YARN-3885) | ProportionalCapacityPreemptionPolicy doesn't preempt if queue is more than 2 level |  Blocker | yarn | Ajith S | Ajith S |
| [YARN-3453](https://issues.apache.org/jira/browse/YARN-3453) | Fair Scheduler: Parts of preemption logic uses DefaultResourceCalculator even in DRF mode causing thrashing |  Major | fairscheduler | Ashwin Shankar | Arun Suresh |
| [YARN-3535](https://issues.apache.org/jira/browse/YARN-3535) | Scheduler must re-request container resources when RMContainer transitions from ALLOCATED to KILLED |  Critical | capacityscheduler, fairscheduler, resourcemanager | Peng Zhang | Peng Zhang |
| [YARN-3905](https://issues.apache.org/jira/browse/YARN-3905) | Application History Server UI NPEs when accessing apps run after RM restart |  Major | timelineserver | Eric Payne | Eric Payne |
| [HADOOP-12235](https://issues.apache.org/jira/browse/HADOOP-12235) | hadoop-openstack junit & mockito dependencies should be "provided" |  Minor | build, fs/swift | Steve Loughran | Ted Yu |
| [HADOOP-12209](https://issues.apache.org/jira/browse/HADOOP-12209) | Comparable type should be in FileStatus |  Minor | fs | Yong Zhang | Yong Zhang |
| [HADOOP-12088](https://issues.apache.org/jira/browse/HADOOP-12088) | KMSClientProvider uses equalsIgnoreCase("application/json") |  Major | kms | Steve Loughran | Brahma Reddy Battula |
| [HADOOP-12051](https://issues.apache.org/jira/browse/HADOOP-12051) | ProtobufRpcEngine.invoke() should use Exception.toString() over getMessage in logging/span events |  Minor | ipc | Steve Loughran | Varun Saxena |
| [HADOOP-12237](https://issues.apache.org/jira/browse/HADOOP-12237) | releasedocmaker.py doesn't work behind a proxy |  Major | yetus | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| [HDFS-7582](https://issues.apache.org/jira/browse/HDFS-7582) | Enforce maximum number of ACL entries separately per access and default. |  Major | namenode | Vinayakumar B | Vinayakumar B |
| [HDFS-8773](https://issues.apache.org/jira/browse/HDFS-8773) | Few FSNamesystem metrics are not documented in the Metrics page |  Major | documentation | Rakesh R | Rakesh R |
| [YARN-3878](https://issues.apache.org/jira/browse/YARN-3878) | AsyncDispatcher can hang while stopping if it is configured for draining events on stop |  Critical | . | Varun Saxena | Varun Saxena |
| [HDFS-7728](https://issues.apache.org/jira/browse/HDFS-7728) | Avoid updating quota usage while loading edits |  Major | . | Jing Zhao | Jing Zhao |
| [HADOOP-11962](https://issues.apache.org/jira/browse/HADOOP-11962) | Sasl message with MD5 challenge text shouldn't be LOG out even in debug level. |  Critical | ipc, security | Junping Du | Junping Du |
| [HADOOP-12017](https://issues.apache.org/jira/browse/HADOOP-12017) | Hadoop archives command should use configurable replication factor when closing |  Major | . | Zhe Zhang | Bibin A Chundatt |
| [HADOOP-12239](https://issues.apache.org/jira/browse/HADOOP-12239) | StorageException complaining " no lease ID" when updating FolderLastModifiedTime in WASB |  Major | fs/azure, tools | Duo Xu | Duo Xu |
| [YARN-3932](https://issues.apache.org/jira/browse/YARN-3932) | SchedulerApplicationAttempt#getResourceUsageReport and UserInfo should based on total-used-resources |  Major | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3954](https://issues.apache.org/jira/browse/YARN-3954) | TestYarnConfigurationFields#testCompareConfigurationClassAgainstXml fails in trunk |  Major | . | Varun Saxena | Varun Saxena |
| [YARN-2019](https://issues.apache.org/jira/browse/YARN-2019) | Retrospect on decision of making RM crashed if any exception throw in ZKRMStateStore |  Critical | . | Junping Du | Jian He |
| [HDFS-8797](https://issues.apache.org/jira/browse/HDFS-8797) | WebHdfsFileSystem creates too many connections for pread |  Major | webhdfs | Jing Zhao | Jing Zhao |
| [YARN-3941](https://issues.apache.org/jira/browse/YARN-3941) | Proportional Preemption policy should try to avoid sending duplicate PREEMPT\_CONTAINER event to scheduler |  Major | capacityscheduler | Sunil G | Sunil G |
| [YARN-3900](https://issues.apache.org/jira/browse/YARN-3900) | Protobuf layout  of yarn\_security\_token causes errors in other protos that include it |  Major | . | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-3845](https://issues.apache.org/jira/browse/YARN-3845) | Scheduler page does not render RGBA color combinations in IE11 |  Minor | . | Jagadesh Kiran N | Mohammad Shahid Khan |
| [HDFS-8806](https://issues.apache.org/jira/browse/HDFS-8806) | Inconsistent metrics: number of missing blocks with replication factor 1 not properly cleared |  Major | . | Zhe Zhang | Zhe Zhang |
| [YARN-3967](https://issues.apache.org/jira/browse/YARN-3967) | Fetch the application report from the AHS if the RM does not know about it |  Major | . | Mit Desai | Mit Desai |
| [YARN-3957](https://issues.apache.org/jira/browse/YARN-3957) | FairScheduler NPE In FairSchedulerQueueInfo causing scheduler page to return 500 |  Major | fairscheduler | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-3925](https://issues.apache.org/jira/browse/YARN-3925) | ContainerLogsUtils#getContainerLogFile fails to read container log files from full disks. |  Critical | nodemanager | zhihai xu | zhihai xu |
| [YARN-3973](https://issues.apache.org/jira/browse/YARN-3973) | Recent changes to application priority management break reservation system from YARN-1051 |  Major | resourcemanager | Carlo Curino | Carlo Curino |
| [YARN-3958](https://issues.apache.org/jira/browse/YARN-3958) | TestYarnConfigurationFields should be moved to hadoop-yarn-api module |  Major | . | Varun Saxena | Varun Saxena |
| [HDFS-8810](https://issues.apache.org/jira/browse/HDFS-8810) | Correct assertions in TestDFSInotifyEventInputStream class. |  Minor | test | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-8785](https://issues.apache.org/jira/browse/HDFS-8785) | TestDistributedFileSystem is failing in trunk |  Major | test | Arpit Agarwal | Xiaoyu Yao |
| [YARN-2194](https://issues.apache.org/jira/browse/YARN-2194) | Cgroups cease to work in RHEL7 |  Critical | nodemanager | Wei Yan | Wei Yan |
| [YARN-3846](https://issues.apache.org/jira/browse/YARN-3846) | RM Web UI queue filter is not working |  Major | yarn | Mohammad Shahid Khan | Mohammad Shahid Khan |
| [HADOOP-12245](https://issues.apache.org/jira/browse/HADOOP-12245) | References to misspelled REMAINING\_QUATA in FileSystemShell.md |  Minor | documentation | Gera Shegalov | Gabor Liptak |
| [YARN-3982](https://issues.apache.org/jira/browse/YARN-3982) | container-executor parsing of container-executor.cfg broken in trunk and branch-2 |  Blocker | nodemanager | Varun Vasudev | Varun Vasudev |
| [HADOOP-12175](https://issues.apache.org/jira/browse/HADOOP-12175) | FsShell must load SpanReceiverHost to support tracing |  Major | tracing | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8670](https://issues.apache.org/jira/browse/HDFS-8670) | Better to exclude decommissioned nodes for namenode NodeUsage JMX |  Major | . | Ming Ma | J.Andreina |
| [HADOOP-10945](https://issues.apache.org/jira/browse/HADOOP-10945) | 4-digit octal umask permissions throws a parse error |  Major | fs | Jason Lowe | Chang Li |
| [YARN-3919](https://issues.apache.org/jira/browse/YARN-3919) | NPEs' while stopping service after exception during CommonNodeLabelsManager#start |  Trivial | resourcemanager | Varun Saxena | Varun Saxena |
| [YARN-3963](https://issues.apache.org/jira/browse/YARN-3963) | AddNodeLabel on duplicate label addition shows success |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [MAPREDUCE-6433](https://issues.apache.org/jira/browse/MAPREDUCE-6433) | launchTime may be negative |  Major | jobhistoryserver, mrv2 | Allen Wittenauer | zhihai xu |
| [YARN-3990](https://issues.apache.org/jira/browse/YARN-3990) | AsyncDispatcher may overloaded with RMAppNodeUpdateEvent when Node is connected/disconnected |  Critical | resourcemanager | Rohith Sharma K S | Bibin A Chundatt |
| [HDFS-6860](https://issues.apache.org/jira/browse/HDFS-6860) | BlockStateChange logs are too noisy |  Major | namenode | Arpit Agarwal | Chang Li |
| [HADOOP-12268](https://issues.apache.org/jira/browse/HADOOP-12268) | AbstractContractAppendTest#testRenameFileBeingAppended misses rename operation. |  Major | test | zhihai xu | zhihai xu |
| [HDFS-8847](https://issues.apache.org/jira/browse/HDFS-8847) | change TestHDFSContractAppend to not override testRenameFileBeingAppended method. |  Major | test | zhihai xu | zhihai xu |
| [HDFS-8850](https://issues.apache.org/jira/browse/HDFS-8850) | VolumeScanner thread exits with exception if there is no block pool to be scanned but there are suspicious blocks |  Major | datanode | Colin P. McCabe | Colin P. McCabe |
| [HDFS-8844](https://issues.apache.org/jira/browse/HDFS-8844) | TestHDFSCLI does not cleanup the test directory |  Minor | test | Akira Ajisaka | Masatake Iwasaki |
| [HADOOP-12274](https://issues.apache.org/jira/browse/HADOOP-12274) | Remove direct download link from BUILDING.txt |  Minor | documentation | Caleb Severn | Caleb Severn |
| [HADOOP-12302](https://issues.apache.org/jira/browse/HADOOP-12302) | Fix native compilation on Windows after HADOOP-7824 |  Blocker | . | Vinayakumar B | Vinayakumar B |
| [YARN-3983](https://issues.apache.org/jira/browse/YARN-3983) | Make CapacityScheduler to easier extend application allocation logic |  Major | . | Wangda Tan | Wangda Tan |
| [HADOOP-12304](https://issues.apache.org/jira/browse/HADOOP-12304) | Applications using FileContext fail with the default file system configured to be wasb/s3/etc. |  Blocker | fs | Chris Nauroth | Chris Nauroth |
| [HADOOP-11932](https://issues.apache.org/jira/browse/HADOOP-11932) |  MetricsSinkAdapter hangs when being stopped |  Critical | . | Jian He | Brahma Reddy Battula |
| [HDFS-8856](https://issues.apache.org/jira/browse/HDFS-8856) | Make LeaseManager#countPath O(1) |  Major | namenode | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8772](https://issues.apache.org/jira/browse/HDFS-8772) | Fix TestStandbyIsHot#testDatanodeRestarts which occasionally fails |  Major | . | Walter Su | Walter Su |
| [YARN-3966](https://issues.apache.org/jira/browse/YARN-3966) | Fix excessive loggings in CapacityScheduler |  Major | . | Jian He | Jian He |
| [HDFS-8866](https://issues.apache.org/jira/browse/HDFS-8866) | Typo in docs: Rumtime -\> Runtime |  Trivial | documentation, webhdfs | Jakob Homan | Gabor Liptak |
| [YARN-3999](https://issues.apache.org/jira/browse/YARN-3999) | RM hangs on draining events |  Major | . | Jian He | Jian He |
| [YARN-4026](https://issues.apache.org/jira/browse/YARN-4026) | FiCaSchedulerApp: ContainerAllocator should be able to choose how to order pending resource requests |  Major | . | Wangda Tan | Wangda Tan |
| [HDFS-8879](https://issues.apache.org/jira/browse/HDFS-8879) | Quota by storage type usage incorrectly initialized upon namenode restart |  Major | namenode | Kihwal Lee | Xiaoyu Yao |
| [HADOOP-12258](https://issues.apache.org/jira/browse/HADOOP-12258) | Need translate java.nio.file.NoSuchFileException to FileNotFoundException to avoid regression |  Critical | fs | zhihai xu | zhihai xu |
| [YARN-4005](https://issues.apache.org/jira/browse/YARN-4005) | Completed container whose app is finished is not removed from NMStateStore |  Major | . | Jun Gong | Jun Gong |
| [YARN-4047](https://issues.apache.org/jira/browse/YARN-4047) | ClientRMService getApplications has high scheduler lock contention |  Major | resourcemanager | Jason Lowe | Jason Lowe |
| [YARN-3987](https://issues.apache.org/jira/browse/YARN-3987) | am container complete msg ack to NM once RM receive it |  Major | resourcemanager | sandflee | sandflee |
| [HADOOP-12322](https://issues.apache.org/jira/browse/HADOOP-12322) | typos in rpcmetrics.java |  Trivial | ipc | Anu Engineer | Anu Engineer |
| [HDFS-8565](https://issues.apache.org/jira/browse/HDFS-8565) | Typo in dfshealth.html - "Decomissioning" |  Trivial | . | nijel | nijel |
| [MAPREDUCE-5817](https://issues.apache.org/jira/browse/MAPREDUCE-5817) | Mappers get rescheduled on node transition even after all reducers are completed |  Major | applicationmaster | Sangjin Lee | Sangjin Lee |
| [HDFS-8891](https://issues.apache.org/jira/browse/HDFS-8891) | HDFS concat should keep srcs order |  Blocker | . | Yong Zhang | Yong Zhang |
| [MAPREDUCE-6439](https://issues.apache.org/jira/browse/MAPREDUCE-6439) | AM may fail instead of retrying if RM shuts down during the allocate call |  Critical | . | Anubhav Dhoot | Anubhav Dhoot |
| [HDFS-8845](https://issues.apache.org/jira/browse/HDFS-8845) | DiskChecker should not traverse the entire tree |  Major | . | Chang Li | Chang Li |
| [HDFS-8852](https://issues.apache.org/jira/browse/HDFS-8852) | HDFS architecture documentation of version 2.x is outdated about append write support |  Major | documentation | Hong Dai Thanh | Ajith S |
| [YARN-3857](https://issues.apache.org/jira/browse/YARN-3857) | Memory leak in ResourceManager with SIMPLE mode |  Critical | resourcemanager | mujunchao | mujunchao |
| [YARN-4028](https://issues.apache.org/jira/browse/YARN-4028) | AppBlock page key update and diagnostics value null on recovery |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-8908](https://issues.apache.org/jira/browse/HDFS-8908) | TestAppendSnapshotTruncate may fail with IOException: Failed to replace a bad datanode |  Minor | test | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8867](https://issues.apache.org/jira/browse/HDFS-8867) | Enable optimized block reports |  Major | . | Rushabh S Shah | Daryn Sharp |
| [HADOOP-12317](https://issues.apache.org/jira/browse/HADOOP-12317) | Applications fail on NM restart on some linux distro because NM container recovery declares AM container as LOST |  Critical | . | Anubhav Dhoot | Anubhav Dhoot |
| [HDFS-8863](https://issues.apache.org/jira/browse/HDFS-8863) | The remaining space check in BlockPlacementPolicyDefault is flawed |  Critical | . | Kihwal Lee | Kihwal Lee |
| [HDFS-8922](https://issues.apache.org/jira/browse/HDFS-8922) | Link the native\_mini\_dfs test library with libdl, since IBM Java requires it |  Major | build | Ayappan | Ayappan |
| [HDFS-8809](https://issues.apache.org/jira/browse/HDFS-8809) | HDFS fsck reports under construction blocks as "CORRUPT" |  Major | tools | Sudhir Prakash | Jing Zhao |
| [MAPREDUCE-6454](https://issues.apache.org/jira/browse/MAPREDUCE-6454) | MapReduce doesn't set the HADOOP\_CLASSPATH for jar lib in distributed cache. |  Critical | . | Junping Du | Junping Du |
| [MAPREDUCE-6357](https://issues.apache.org/jira/browse/MAPREDUCE-6357) | MultipleOutputs.write() API should document that output committing is not utilized when input path is absolute |  Major | documentation | Ivan Mitic | Dustin Cote |
| [YARN-3986](https://issues.apache.org/jira/browse/YARN-3986) | getTransferredContainers in AbstractYarnScheduler should be present in YarnScheduler interface instead |  Major | scheduler | Varun Saxena | Varun Saxena |
| [HADOOP-12347](https://issues.apache.org/jira/browse/HADOOP-12347) | Fix mismatch parameter name in javadocs of AuthToken#setMaxInactives |  Trivial | . | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-8942](https://issues.apache.org/jira/browse/HDFS-8942) | Update hyperlink to rack awareness page in HDFS Architecture documentation |  Trivial | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-3896](https://issues.apache.org/jira/browse/YARN-3896) | RMNode transitioned from RUNNING to REBOOTED because its response id had not been reset synchronously |  Major | resourcemanager | Jun Gong | Jun Gong |
| [HDFS-8930](https://issues.apache.org/jira/browse/HDFS-8930) | Block report lease may leak if the 2nd full block report comes when NN is still in safemode |  Minor | . | Jing Zhao | Jing Zhao |
| [HDFS-8932](https://issues.apache.org/jira/browse/HDFS-8932) | NPE thrown in NameNode when try to get "TotalSyncCount" metric before editLogStream initialization |  Major | . | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-12352](https://issues.apache.org/jira/browse/HADOOP-12352) | Delay in checkpointing Trash can leave trash for 2 intervals before deleting |  Trivial | trash | Casey Brotherton | Casey Brotherton |
| [HDFS-8846](https://issues.apache.org/jira/browse/HDFS-8846) | Add a unit test for INotify functionality across a layout version upgrade |  Major | namenode | Zhe Zhang | Zhe Zhang |
| [HDFS-8896](https://issues.apache.org/jira/browse/HDFS-8896) | DataNode object isn't GCed when shutdown, because it has GC root in ShutdownHookManager |  Minor | test | Walter Su | Walter Su |
| [HDFS-8961](https://issues.apache.org/jira/browse/HDFS-8961) | Surpress findbug warnings of o.a.h.hdfs.shortcircuit.DfsClientShmManager.EndpointShmManager in hdfs-client |  Major | . | Haohui Mai | Mingliang Liu |
| [HADOOP-12362](https://issues.apache.org/jira/browse/HADOOP-12362) | Set hadoop.tmp.dir and hadoop.log.dir in pom |  Major | . | Charlie Helin | Charlie Helin |
| [HDFS-8969](https://issues.apache.org/jira/browse/HDFS-8969) | Clean up findbugs warnings for HDFS-8823 and HDFS-8932 |  Major | namenode | Anu Engineer | Anu Engineer |
| [HDFS-8963](https://issues.apache.org/jira/browse/HDFS-8963) | Fix incorrect sign extension of xattr length in HDFS-8900 |  Critical | . | Haohui Mai | Colin P. McCabe |
| [YARN-1556](https://issues.apache.org/jira/browse/YARN-1556) | NPE getting application report with a null appId |  Minor | client | Steve Loughran | Weiwei Yang |
| [MAPREDUCE-6452](https://issues.apache.org/jira/browse/MAPREDUCE-6452) | NPE when intermediate encrypt enabled for LocalRunner |  Major | . | Bibin A Chundatt | zhihai xu |
| [HDFS-8950](https://issues.apache.org/jira/browse/HDFS-8950) | NameNode refresh doesn't remove DataNodes that are no longer in the allowed list |  Major | datanode, namenode | Daniel Templeton | Daniel Templeton |
| [HADOOP-12346](https://issues.apache.org/jira/browse/HADOOP-12346) | Increase some default timeouts / retries for S3a connector |  Major | fs/s3 | Sean Mackrory | Sean Mackrory |
| [HADOOP-12359](https://issues.apache.org/jira/browse/HADOOP-12359) | hadoop fs -getmerge doc is wrong |  Major | documentation | Daniel Templeton | Jagadesh Kiran N |
| [HADOOP-10365](https://issues.apache.org/jira/browse/HADOOP-10365) | BufferedOutputStream in FileUtil#unpackEntries() should be closed in finally block |  Minor | util | Ted Yu | Kiran Kumar M R |
| [HDFS-8995](https://issues.apache.org/jira/browse/HDFS-8995) | Flaw in registration bookeeping can make DN die on reconnect |  Critical | . | Kihwal Lee | Kihwal Lee |
| [HDFS-8388](https://issues.apache.org/jira/browse/HDFS-8388) | Time and Date format need to be in sync in NameNode UI page |  Minor | . | Archana T | Surendra Singh Lilhore |
| [YARN-4073](https://issues.apache.org/jira/browse/YARN-4073) | Unused ApplicationACLsManager in ContainerManagerImpl |  Trivial | . | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9003](https://issues.apache.org/jira/browse/HDFS-9003) | ForkJoin thread pool leaks |  Major | . | Kihwal Lee | Kihwal Lee |
| [HDFS-8885](https://issues.apache.org/jira/browse/HDFS-8885) | ByteRangeInputStream used in webhdfs does not override available() |  Minor | webhdfs | Shradha Revankar | Shradha Revankar |
| [HADOOP-10318](https://issues.apache.org/jira/browse/HADOOP-10318) | Incorrect reference to nodeFile in RumenToSLSConverter error message |  Minor | . | Ted Yu | Wei Yan |
| [HADOOP-12213](https://issues.apache.org/jira/browse/HADOOP-12213) | Interrupted exception can occur when Client#stop is called |  Minor | . | Oleg Zhurakousky | Kuhu Shukla |
| [HDFS-9009](https://issues.apache.org/jira/browse/HDFS-9009) | Send metrics logs to NullAppender by default |  Major | logging | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8964](https://issues.apache.org/jira/browse/HDFS-8964) | When validating the edit log, do not read at or beyond the file offset that is being written |  Major | journal-node, namenode | Zhe Zhang | Zhe Zhang |
| [HDFS-8939](https://issues.apache.org/jira/browse/HDFS-8939) | Test(S)WebHdfsFileContextMainOperations failing on branch-2 |  Major | webhdfs | Jakob Homan | Chris Nauroth |
| [YARN-4103](https://issues.apache.org/jira/browse/YARN-4103) | RM WebServices missing scheme for appattempts logLinks |  Major | . | Jonathan Eagles | Jonathan Eagles |
| [YARN-4105](https://issues.apache.org/jira/browse/YARN-4105) | Capacity Scheduler headroom for DRF is wrong |  Major | capacityscheduler | Chang Li | Chang Li |
| [MAPREDUCE-6442](https://issues.apache.org/jira/browse/MAPREDUCE-6442) | Stack trace is missing when error occurs in client protocol provider's constructor |  Major | client | Chang Li | Chang Li |
| [YARN-3591](https://issues.apache.org/jira/browse/YARN-3591) | Resource localization on a bad disk causes subsequent containers failure |  Major | . | Lavkesh Lahngir | Lavkesh Lahngir |
| [YARN-4121](https://issues.apache.org/jira/browse/YARN-4121) | Typos in capacity scheduler documentation. |  Trivial | documentation | Kai Sasaki | Kai Sasaki |
| [YARN-4096](https://issues.apache.org/jira/browse/YARN-4096) | App local logs are leaked if log aggregation fails to initialize for the app |  Major | log-aggregation, nodemanager | Jason Lowe | Jason Lowe |
| [HADOOP-12388](https://issues.apache.org/jira/browse/HADOOP-12388) | Fix components' version information in the web page 'About the Cluster' |  Minor | util | Jun Gong | Jun Gong |
| [HDFS-9033](https://issues.apache.org/jira/browse/HDFS-9033) | dfsadmin -metasave prints "NaN" for cache used% |  Major | . | Archana T | Brahma Reddy Battula |
| [HDFS-8716](https://issues.apache.org/jira/browse/HDFS-8716) | introduce a new config specifically for safe mode block count |  Major | . | Chang Li | Chang Li |
| [HDFS-8581](https://issues.apache.org/jira/browse/HDFS-8581) | ContentSummary on / skips further counts on yielding lock |  Minor | namenode | tongshiquan | J.Andreina |
| [HDFS-6763](https://issues.apache.org/jira/browse/HDFS-6763) | Initialize file system-wide quota once on transitioning to active |  Major | ha, namenode | Daryn Sharp | Kihwal Lee |
| [MAPREDUCE-6474](https://issues.apache.org/jira/browse/MAPREDUCE-6474) | ShuffleHandler can possibly exhaust nodemanager file descriptors |  Major | mrv2, nodemanager | Nathan Roberts | Kuhu Shukla |
| [YARN-4106](https://issues.apache.org/jira/browse/YARN-4106) | NodeLabels for NM in distributed mode is not updated even after clusterNodelabel addition in RM |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-4115](https://issues.apache.org/jira/browse/YARN-4115) | Reduce loglevel of ContainerManagementProtocolProxy to Debug |  Minor | . | Anubhav Dhoot | Anubhav Dhoot |
| [HADOOP-12348](https://issues.apache.org/jira/browse/HADOOP-12348) | MetricsSystemImpl creates MetricsSourceAdapter with wrong time unit parameter. |  Major | metrics | zhihai xu | zhihai xu |
| [HDFS-9042](https://issues.apache.org/jira/browse/HDFS-9042) | Update document for the Storage policy name |  Minor | documentation | J.Andreina | J.Andreina |
| [HDFS-9036](https://issues.apache.org/jira/browse/HDFS-9036) | In BlockPlacementPolicyWithNodeGroup#chooseLocalStorage , random node is selected eventhough fallbackToLocalRack is true. |  Major | . | J.Andreina | J.Andreina |
| [HADOOP-12407](https://issues.apache.org/jira/browse/HADOOP-12407) | Test failing: hadoop.ipc.TestSaslRPC |  Critical | security, test | Steve Loughran | Steve Loughran |
| [HADOOP-12087](https://issues.apache.org/jira/browse/HADOOP-12087) | [JDK8] Fix javadoc errors caused by incorrect or illegal tags |  Major | documentation | Akira Ajisaka | Akira Ajisaka |
| [HDFS-9069](https://issues.apache.org/jira/browse/HDFS-9069) | TestNameNodeMetricsLogger failing -port in use |  Critical | test | Steve Loughran | Steve Loughran |
| [HDFS-8996](https://issues.apache.org/jira/browse/HDFS-8996) | Consolidate validateLog and scanLog in FJM#EditLogFile |  Major | journal-node, namenode | Zhe Zhang | Zhe Zhang |
| [YARN-4151](https://issues.apache.org/jira/browse/YARN-4151) | Fix findbugs errors in hadoop-yarn-server-common module |  Major | . | MENG DING | MENG DING |
| [HDFS-9067](https://issues.apache.org/jira/browse/HDFS-9067) | o.a.h.hdfs.server.datanode.fsdataset.impl.TestLazyWriter is failing in trunk |  Critical | . | Haohui Mai | Surendra Singh Lilhore |
| [MAPREDUCE-6472](https://issues.apache.org/jira/browse/MAPREDUCE-6472) | MapReduce AM should have java.io.tmpdir=./tmp to be consistent with tasks |  Major | mr-am | Jason Lowe | Naganarasimha G R |
| [HADOOP-12374](https://issues.apache.org/jira/browse/HADOOP-12374) | Description of hdfs expunge command is confusing |  Major | documentation, trash | Weiwei Yang | Weiwei Yang |
| [YARN-4078](https://issues.apache.org/jira/browse/YARN-4078) | getPendingResourceRequestForAttempt is present in AbstractYarnScheduler should be present in YarnScheduler interface instead |  Minor | resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9072](https://issues.apache.org/jira/browse/HDFS-9072) | Fix random failures in TestJMXGet |  Critical | test | J.Andreina | J.Andreina |
| [HDFS-9073](https://issues.apache.org/jira/browse/HDFS-9073) | Fix failures in TestLazyPersistLockedMemory#testReleaseOnEviction |  Critical | test | J.Andreina | J.Andreina |
| [YARN-3433](https://issues.apache.org/jira/browse/YARN-3433) | Jersey tests failing with Port in Use -again |  Critical | build, test | Steve Loughran | Brahma Reddy Battula |
| [HADOOP-12417](https://issues.apache.org/jira/browse/HADOOP-12417) | TestWebDelegationToken failing with port in use |  Major | test | Steve Loughran | Mingliang Liu |
| [MAPREDUCE-6481](https://issues.apache.org/jira/browse/MAPREDUCE-6481) | LineRecordReader may give incomplete record and wrong position/key information for uncompressed input sometimes. |  Critical | mrv2 | zhihai xu | zhihai xu |
| [MAPREDUCE-5002](https://issues.apache.org/jira/browse/MAPREDUCE-5002) | AM could potentially allocate a reduce container to a map attempt |  Major | mr-am | Jason Lowe | Chang Li |
| [MAPREDUCE-5982](https://issues.apache.org/jira/browse/MAPREDUCE-5982) | Task attempts that fail from the ASSIGNED state can disappear |  Major | mr-am | Jason Lowe | Chang Li |
| [HADOOP-12386](https://issues.apache.org/jira/browse/HADOOP-12386) | RetryPolicies.RETRY\_FOREVER should be able to specify a retry interval |  Major | . | Wangda Tan | Sunil G |
| [YARN-3697](https://issues.apache.org/jira/browse/YARN-3697) | FairScheduler: ContinuousSchedulingThread can fail to shutdown |  Critical | fairscheduler | zhihai xu | zhihai xu |
| [HDFS-6955](https://issues.apache.org/jira/browse/HDFS-6955) | DN should reserve disk space for a full block when creating tmp files |  Major | datanode | Arpit Agarwal | Kanaka Kumar Avvaru |
| [HDFS-5802](https://issues.apache.org/jira/browse/HDFS-5802) | NameNode does not check for inode type before traversing down a path |  Trivial | namenode | Harsh J | Xiao Chen |
| [MAPREDUCE-6460](https://issues.apache.org/jira/browse/MAPREDUCE-6460) | TestRMContainerAllocator.testAttemptNotFoundCausesRMCommunicatorException fails |  Major | test | zhihai xu | zhihai xu |
| [YARN-4167](https://issues.apache.org/jira/browse/YARN-4167) | NPE on RMActiveServices#serviceStop when store is null |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-4113](https://issues.apache.org/jira/browse/YARN-4113) | RM should respect retry-interval when uses RetryPolicies.RETRY\_FOREVER |  Critical | . | Wangda Tan | Sunil G |
| [YARN-4188](https://issues.apache.org/jira/browse/YARN-4188) | MoveApplicationAcrossQueuesResponse should be an abstract class |  Minor | resourcemanager | Giovanni Matteo Fumarola | Giovanni Matteo Fumarola |
| [HDFS-9043](https://issues.apache.org/jira/browse/HDFS-9043) | Doc updation for commands in HDFS Federation |  Minor | documentation | J.Andreina | J.Andreina |
| [HDFS-9013](https://issues.apache.org/jira/browse/HDFS-9013) | Deprecate NameNodeMXBean#getNNStarted in branch2 and remove from trunk |  Major | namenode | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [YARN-3975](https://issues.apache.org/jira/browse/YARN-3975) | WebAppProxyServlet should not redirect to RM page if AHS is enabled |  Major | . | Mit Desai | Mit Desai |
| [HADOOP-12438](https://issues.apache.org/jira/browse/HADOOP-12438) | Reset RawLocalFileSystem.useDeprecatedFileStatus in TestLocalFileSystem |  Trivial | test | Chris Nauroth | Chris Nauroth |
| [HDFS-9128](https://issues.apache.org/jira/browse/HDFS-9128) | TestWebHdfsFileContextMainOperations and TestSWebHdfsFileContextMainOperations fail due to invalid HDFS path on Windows. |  Trivial | test | Chris Nauroth | Chris Nauroth |
| [YARN-4152](https://issues.apache.org/jira/browse/YARN-4152) | NM crash with NPE when LogAggregationService#stopContainer called for absent container |  Critical | log-aggregation, nodemanager | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-4044](https://issues.apache.org/jira/browse/YARN-4044) | Running applications information changes such as movequeue is not published to TimeLine server |  Critical | resourcemanager, timelineserver | Sunil G | Sunil G |
| [HDFS-9076](https://issues.apache.org/jira/browse/HDFS-9076) | Log full path instead of inodeId in DFSClient#closeAllFilesBeingWritten() |  Major | hdfs-client | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [MAPREDUCE-6484](https://issues.apache.org/jira/browse/MAPREDUCE-6484) | Yarn Client uses local address instead of RM address as token renewer in a secure cluster when RM HA is enabled. |  Major | client, security | zhihai xu | zhihai xu |
| [HADOOP-12437](https://issues.apache.org/jira/browse/HADOOP-12437) | Allow SecurityUtil to lookup alternate hostnames |  Major | net, security | Arpit Agarwal | Arpit Agarwal |
| [HADOOP-12252](https://issues.apache.org/jira/browse/HADOOP-12252) | LocalDirAllocator should not throw NPE with empty string configuration. |  Minor | fs | zhihai xu | zhihai xu |
| [YARN-3624](https://issues.apache.org/jira/browse/YARN-3624) | ApplicationHistoryServer reverses the order of the filters it gets |  Major | timelineserver | Mit Desai | Mit Desai |
| [HDFS-9123](https://issues.apache.org/jira/browse/HDFS-9123) | Copying from the root to a subdirectory should be forbidden |  Minor | fs | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [MAPREDUCE-6480](https://issues.apache.org/jira/browse/MAPREDUCE-6480) | archive-logs tool may miss applications |  Major | . | Robert Kanter | Robert Kanter |
| [HDFS-9107](https://issues.apache.org/jira/browse/HDFS-9107) | Prevent NN's unrecoverable death spiral after full GC |  Critical | namenode | Daryn Sharp | Daryn Sharp |
| [HDFS-9133](https://issues.apache.org/jira/browse/HDFS-9133) | ExternalBlockReader and ReplicaAccessor need to return -1 on read when at EOF |  Major | hdfs-client | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9080](https://issues.apache.org/jira/browse/HDFS-9080) | update htrace version to 4.0.1 |  Major | tracing | Colin P. McCabe | Colin P. McCabe |
| [YARN-4204](https://issues.apache.org/jira/browse/YARN-4204) | ConcurrentModificationException in FairSchedulerQueueInfo |  Major | . | Anubhav Dhoot | Anubhav Dhoot |
| [HDFS-9106](https://issues.apache.org/jira/browse/HDFS-9106) | Transfer failure during pipeline recovery causes permanent write failures |  Critical | . | Kihwal Lee | Kihwal Lee |
| [HDFS-9147](https://issues.apache.org/jira/browse/HDFS-9147) | Fix the setting of visibleLength in ExternalBlockReader |  Major | hdfs-client | Colin P. McCabe | Colin P. McCabe |
| [MAPREDUCE-6492](https://issues.apache.org/jira/browse/MAPREDUCE-6492) | AsyncDispatcher exit with NPE on TaskAttemptImpl#sendJHStartEventForAssignedFailTask |  Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| [HADOOP-12440](https://issues.apache.org/jira/browse/HADOOP-12440) | TestRPC#testRPCServerShutdown did not produce the desired thread states before shutting down |  Minor | . | Xiao Chen | Xiao Chen |
| [HDFS-9092](https://issues.apache.org/jira/browse/HDFS-9092) | Nfs silently drops overlapping write requests and causes data copying to fail |  Major | nfs | Yongjun Zhang | Yongjun Zhang |
| [YARN-4180](https://issues.apache.org/jira/browse/YARN-4180) | AMLauncher does not retry on failures when talking to NM |  Critical | resourcemanager | Anubhav Dhoot | Anubhav Dhoot |
| [HDFS-9141](https://issues.apache.org/jira/browse/HDFS-9141) | Thread leak in Datanode#refreshVolumes |  Major | datanode | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [YARN-4066](https://issues.apache.org/jira/browse/YARN-4066) | Large number of queues choke fair scheduler |  Major | fairscheduler | Johan Gustavsson | Johan Gustavsson |
| [HADOOP-12447](https://issues.apache.org/jira/browse/HADOOP-12447) | Clean up some htrace integration issues |  Major | tracing | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9174](https://issues.apache.org/jira/browse/HDFS-9174) | Fix findbugs warnings in FSOutputSummer.tracer and DirectoryScanner$ReportCompiler.currentThread |  Critical | . | Yi Liu | Yi Liu |
| [HDFS-9001](https://issues.apache.org/jira/browse/HDFS-9001) | DFSUtil.getNsServiceRpcUris() can return too many entries in a non-HA, non-federated cluster |  Major | . | Daniel Templeton | Daniel Templeton |
| [HADOOP-12448](https://issues.apache.org/jira/browse/HADOOP-12448) | TestTextCommand: use mkdirs rather than mkdir to create test directory |  Major | test | Colin P. McCabe | Colin P. McCabe |
| [MAPREDUCE-6494](https://issues.apache.org/jira/browse/MAPREDUCE-6494) | Permission issue when running archive-logs tool as different users |  Major | . | Robert Kanter | Robert Kanter |
| [MAPREDUCE-6497](https://issues.apache.org/jira/browse/MAPREDUCE-6497) | Fix wrong value of JOB\_FINISHED event in JobHistoryEventHandler |  Major | . | Shinichi Yamashita | Shinichi Yamashita |
| [HADOOP-10296](https://issues.apache.org/jira/browse/HADOOP-10296) | Incorrect null check in SwiftRestClient#buildException() |  Minor | . | Ted Yu | Kanaka Kumar Avvaru |
| [HADOOP-8437](https://issues.apache.org/jira/browse/HADOOP-8437) | getLocalPathForWrite should throw IOException for invalid paths |  Major | fs | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6485](https://issues.apache.org/jira/browse/MAPREDUCE-6485) | MR job hanged forever because all resources are taken up by reducers and the last map attempt never get resource to run |  Critical | applicationmaster | Bob.zhao | Xianyin Xin |
| [HDFS-9191](https://issues.apache.org/jira/browse/HDFS-9191) | Typo in  Hdfs.java.  NoSuchElementException is misspelled |  Trivial | documentation | Catherine Palmer | Catherine Palmer |
| [HDFS-9100](https://issues.apache.org/jira/browse/HDFS-9100) | HDFS Balancer does not respect dfs.client.use.datanode.hostname |  Major | balancer & mover | Yongjun Zhang | Casey Brotherton |
| [YARN-3619](https://issues.apache.org/jira/browse/YARN-3619) | ContainerMetrics unregisters during getMetrics and leads to ConcurrentModificationException |  Major | nodemanager | Jason Lowe | zhihai xu |
| [HDFS-9193](https://issues.apache.org/jira/browse/HDFS-9193) | Fix incorrect references the usages of the DN in dfshealth.js |  Minor | . | Chang Li | Chang Li |
| [HADOOP-11098](https://issues.apache.org/jira/browse/HADOOP-11098) | [JDK8] Max Non Heap Memory default changed between JDK7 and 8 |  Major | . | Travis Thompson | Tsuyoshi Ozawa |
| [HADOOP-12441](https://issues.apache.org/jira/browse/HADOOP-12441) | Fix kill command behavior under some Linux distributions. |  Critical | . | Wangda Tan | Wangda Tan |
| [HADOOP-12452](https://issues.apache.org/jira/browse/HADOOP-12452) | Fix tracing documention reflecting the update to htrace-4 |  Major | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-4176](https://issues.apache.org/jira/browse/YARN-4176) | Resync NM nodelabels with RM periodically for distributed nodelabels |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-7899](https://issues.apache.org/jira/browse/HDFS-7899) | Improve EOF error message |  Minor | hdfs-client | Harsh J | Jagadesh Kiran N |
| [MAPREDUCE-6503](https://issues.apache.org/jira/browse/MAPREDUCE-6503) | archive-logs tool should use HADOOP\_PREFIX instead of HADOOP\_HOME |  Major | . | Robert Kanter | Robert Kanter |
| [YARN-4209](https://issues.apache.org/jira/browse/YARN-4209) | RMStateStore FENCED state doesn't work due to updateFencedState called by stateMachine.doTransition |  Critical | resourcemanager | zhihai xu | zhihai xu |
| [HDFS-9196](https://issues.apache.org/jira/browse/HDFS-9196) | Fix TestWebHdfsContentLength |  Major | . | Tsuyoshi Ozawa | Masatake Iwasaki |
| [HDFS-9178](https://issues.apache.org/jira/browse/HDFS-9178) | Slow datanode I/O can cause a wrong node to be marked bad |  Critical | . | Kihwal Lee | Kihwal Lee |
| [HADOOP-12465](https://issues.apache.org/jira/browse/HADOOP-12465) | Incorrect javadoc in WritableUtils.java |  Minor | documentation | Martin Petricek | Jagadesh Kiran N |
| [HDFS-9176](https://issues.apache.org/jira/browse/HDFS-9176) | TestDirectoryScanner#testThrottling often fails. |  Minor | test | Yi Liu | Daniel Templeton |
| [HDFS-9211](https://issues.apache.org/jira/browse/HDFS-9211) | Fix incorrect version in hadoop-hdfs-native-client/pom.xml from HDFS-9170 branch-2 backport |  Major | build | Eric Payne | Eric Payne |
| [HDFS-9137](https://issues.apache.org/jira/browse/HDFS-9137) | DeadLock between DataNode#refreshVolumes and BPOfferService#registrationSucceeded |  Major | datanode | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-8164](https://issues.apache.org/jira/browse/HDFS-8164) | cTime is 0 in VERSION file for newly formatted NameNode. |  Minor | namenode | Chris Nauroth | Xiao Chen |
| [YARN-4235](https://issues.apache.org/jira/browse/YARN-4235) | FairScheduler PrimaryGroup does not handle empty groups returned for a user |  Major | fairscheduler | Anubhav Dhoot | Anubhav Dhoot |
| [MAPREDUCE-6302](https://issues.apache.org/jira/browse/MAPREDUCE-6302) | Preempt reducers after a configurable timeout irrespective of headroom |  Critical | . | mai shurong | Karthik Kambatla |
| [HDFS-9142](https://issues.apache.org/jira/browse/HDFS-9142) | Separating Configuration object for namenode(s) in MiniDFSCluster |  Major | . | Siqi Li | Siqi Li |
| [HDFS-8941](https://issues.apache.org/jira/browse/HDFS-8941) | DistributedFileSystem listCorruptFileBlocks API should resolve relative path |  Major | hdfs-client | Rakesh R | Rakesh R |
| [HDFS-9222](https://issues.apache.org/jira/browse/HDFS-9222) | Add hadoop-hdfs-client as a dependency of hadoop-hdfs-native-client |  Major | . | Haohui Mai | Mingliang Liu |
| [YARN-4201](https://issues.apache.org/jira/browse/YARN-4201) | AMBlacklist does not work for minicluster |  Major | resourcemanager | Jun Gong | Jun Gong |
| [HDFS-9215](https://issues.apache.org/jira/browse/HDFS-9215) | Suppress the RAT warnings in hdfs-native-client module |  Minor | . | Haohui Mai | Haohui Mai |
| [HDFS-9224](https://issues.apache.org/jira/browse/HDFS-9224) | TestFileTruncate fails intermittently with BindException |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4017](https://issues.apache.org/jira/browse/YARN-4017) | container-executor overuses PATH\_MAX |  Major | nodemanager | Allen Wittenauer | Sidharta Seethana |
| [HDFS-8676](https://issues.apache.org/jira/browse/HDFS-8676) | Delayed rolling upgrade finalization can cause heartbeat expiration and write failures |  Critical | . | Kihwal Lee | Walter Su |
| [HADOOP-12474](https://issues.apache.org/jira/browse/HADOOP-12474) | MiniKMS should use random ports for Jetty server by default |  Major | . | Mingliang Liu | Mingliang Liu |
| [HADOOP-12449](https://issues.apache.org/jira/browse/HADOOP-12449) | TestDNS and TestNetUtils failing if no network |  Minor | test | Steve Loughran | Steve Loughran |
| [HADOOP-11515](https://issues.apache.org/jira/browse/HADOOP-11515) | Upgrade jsch lib to jsch-0.1.51 to avoid problems running on java7 |  Major | build | Johannes Zillmann | Tsuyoshi Ozawa |
| [HDFS-9235](https://issues.apache.org/jira/browse/HDFS-9235) | hdfs-native-client build getting errors when built with cmake 2.6 |  Minor | hdfs-client | Eric Payne | Eric Payne |
| [HDFS-8779](https://issues.apache.org/jira/browse/HDFS-8779) | WebUI fails to display block IDs that are larger than 2^53 - 1 |  Minor | webhdfs | Walter Su | Haohui Mai |
| [HDFS-9187](https://issues.apache.org/jira/browse/HDFS-9187) | Fix null pointer error in Globber when FS was not constructed via FileSystem#createFileSystem |  Major | tracing | stack | Colin P. McCabe |
| [HDFS-1172](https://issues.apache.org/jira/browse/HDFS-1172) | Blocks in newly completed files are considered under-replicated too quickly |  Major | namenode | Todd Lipcon | Masatake Iwasaki |
| [YARN-4250](https://issues.apache.org/jira/browse/YARN-4250) | NPE in AppSchedulingInfo#isRequestLabelChanged |  Major | resourcemanager, scheduler | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12478](https://issues.apache.org/jira/browse/HADOOP-12478) | Shell.getWinUtilsPath()  has been renamed Shell.getWinutilsPath() |  Critical | util | Steve Loughran | Steve Loughran |
| [HDFS-9220](https://issues.apache.org/jira/browse/HDFS-9220) | Reading small file (\< 512 bytes) that is open for append fails due to incorrect checksum |  Blocker | . | Bogdan Raducanu | Jing Zhao |
| [HADOOP-12479](https://issues.apache.org/jira/browse/HADOOP-12479) | ProtocMojo does not log the reason for a protoc compilation failure. |  Minor | build | Chris Nauroth | Chris Nauroth |
| [HADOOP-11628](https://issues.apache.org/jira/browse/HADOOP-11628) | SPNEGO auth does not work with CNAMEs in JDK8 |  Blocker | security | Daryn Sharp | Daryn Sharp |
| [YARN-2597](https://issues.apache.org/jira/browse/YARN-2597) | MiniYARNCluster should propagate reason for AHS not starting |  Major | test | Steve Loughran | Steve Loughran |
| [YARN-4155](https://issues.apache.org/jira/browse/YARN-4155) | TestLogAggregationService.testLogAggregationServiceWithInterval failing |  Critical | test | Steve Loughran | Bibin A Chundatt |
| [HADOOP-10941](https://issues.apache.org/jira/browse/HADOOP-10941) | Proxy user verification NPEs if remote host is unresolvable |  Critical | ipc, security | Daryn Sharp | Benoy Antony |
| [HADOOP-12483](https://issues.apache.org/jira/browse/HADOOP-12483) | Maintain wrapped SASL ordering for postponed IPC responses |  Critical | ipc | Daryn Sharp | Daryn Sharp |
| [HDFS-9237](https://issues.apache.org/jira/browse/HDFS-9237) | NPE at TestDataNodeVolumeFailureToleration#tearDown |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12464](https://issues.apache.org/jira/browse/HADOOP-12464) | Interrupted client may try to fail-over and retry |  Major | ipc | Kihwal Lee | Kihwal Lee |
| [YARN-4270](https://issues.apache.org/jira/browse/YARN-4270) | Limit application resource reservation on nodes for non-node/rack specific requests |  Major | fairscheduler | Arun Suresh | Arun Suresh |
| [HDFS-9208](https://issues.apache.org/jira/browse/HDFS-9208) | Disabling atime may fail clients like distCp |  Major | . | Kihwal Lee | Kihwal Lee |
| [HDFS-9270](https://issues.apache.org/jira/browse/HDFS-9270) | TestShortCircuitLocalRead should not leave socket after unit test |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-12418](https://issues.apache.org/jira/browse/HADOOP-12418) | TestRPC.testRPCInterruptedSimple fails intermittently |  Major | test | Steve Loughran | Kihwal Lee |
| [MAPREDUCE-6495](https://issues.apache.org/jira/browse/MAPREDUCE-6495) | Docs for archive-logs tool |  Major | documentation | Robert Kanter | Robert Kanter |
| [HDFS-3059](https://issues.apache.org/jira/browse/HDFS-3059) | ssl-server.xml causes NullPointer |  Minor | datanode, security | Evert Lammerts | Xiao Chen |
| [HDFS-9274](https://issues.apache.org/jira/browse/HDFS-9274) | Default value of dfs.datanode.directoryscan.throttle.limit.ms.per.sec should be consistent |  Trivial | datanode | Yi Liu | Yi Liu |
| [MAPREDUCE-6518](https://issues.apache.org/jira/browse/MAPREDUCE-6518) | Set SO\_KEEPALIVE on shuffle connections |  Major | mrv2, nodemanager | Nathan Roberts | Chang Li |
| [HDFS-9225](https://issues.apache.org/jira/browse/HDFS-9225) | Fix intermittent test failure of TestBlockManager.testBlocksAreNotUnderreplicatedInSingleRack |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-9273](https://issues.apache.org/jira/browse/HDFS-9273) | ACLs on root directory may be lost after NN restart |  Critical | namenode | Xiao Chen | Xiao Chen |
| [YARN-4000](https://issues.apache.org/jira/browse/YARN-4000) | RM crashes with NPE if leaf queue becomes parent queue during restart |  Major | capacityscheduler, resourcemanager | Jason Lowe | Varun Saxena |
| [HADOOP-9692](https://issues.apache.org/jira/browse/HADOOP-9692) | Improving log message when SequenceFile reader throws EOFException on zero-length file |  Major | . | Chu Tong | Zhe Zhang |
| [YARN-4256](https://issues.apache.org/jira/browse/YARN-4256) | YARN fair scheduler vcores with decimal values |  Minor | fairscheduler | Prabhu Joseph | Jun Gong |
| [HADOOP-12484](https://issues.apache.org/jira/browse/HADOOP-12484) | Single File Rename Throws Incorrectly In Potential Race Condition Scenarios |  Major | tools | Gaurav Kanade | Gaurav Kanade |
| [HDFS-9286](https://issues.apache.org/jira/browse/HDFS-9286) | HttpFs does not parse ACL syntax correctly for operation REMOVEACLENTRIES |  Major | fs | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4009](https://issues.apache.org/jira/browse/YARN-4009) | CORS support for ResourceManager REST API |  Major | . | Prakash Ramachandran | Varun Vasudev |
| [YARN-4041](https://issues.apache.org/jira/browse/YARN-4041) | Slow delegation token renewal can severely prolong RM recovery |  Major | resourcemanager | Jason Lowe | Sunil G |
| [HDFS-9290](https://issues.apache.org/jira/browse/HDFS-9290) | DFSClient#callAppend() is not backward compatible for slightly older NameNodes |  Blocker | . | Tony Wu | Tony Wu |
| [HDFS-9301](https://issues.apache.org/jira/browse/HDFS-9301) | HDFS clients can't construct HdfsConfiguration instances |  Major | . | Steve Loughran | Mingliang Liu |
| [YARN-4294](https://issues.apache.org/jira/browse/YARN-4294) | [JDK8] Fix javadoc errors caused by wrong reference and illegal tag |  Blocker | build, documentation | Akira Ajisaka | Akira Ajisaka |
| [YARN-4289](https://issues.apache.org/jira/browse/YARN-4289) | TestDistributedShell failing with bind exception |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4296](https://issues.apache.org/jira/browse/YARN-4296) | DistributedShell Log.info is not friendly |  Major | applications/distributed-shell | Xiaowei Wang | Xiaowei Wang |
| [YARN-4246](https://issues.apache.org/jira/browse/YARN-4246) | NPE while listing app attempt |  Major | . | Varun Saxena | nijel |
| [YARN-4223](https://issues.apache.org/jira/browse/YARN-4223) | Findbugs warnings in hadoop-yarn-server-nodemanager project |  Minor | nodemanager | Varun Saxena | Varun Saxena |
| [HADOOP-12513](https://issues.apache.org/jira/browse/HADOOP-12513) | Dockerfile lacks initial 'apt-get update' |  Trivial | build | Akihiro Suda | Akihiro Suda |
| [YARN-4284](https://issues.apache.org/jira/browse/YARN-4284) | condition for AM blacklisting is too narrow |  Major | resourcemanager | Sangjin Lee | Sangjin Lee |
| [HDFS-9268](https://issues.apache.org/jira/browse/HDFS-9268) | fuse\_dfs chown crashes when uid is passed as -1 |  Minor | . | Wei-Chiu Chuang | Colin P. McCabe |
| [HDFS-9284](https://issues.apache.org/jira/browse/HDFS-9284) | fsck command should not print exception trace when file not found |  Major | . | Jagadesh Kiran N | Jagadesh Kiran N |
| [HDFS-9305](https://issues.apache.org/jira/browse/HDFS-9305) | Delayed heartbeat processing causes storm of subsequent heartbeats |  Major | datanode | Chris Nauroth | Arpit Agarwal |
| [YARN-4169](https://issues.apache.org/jira/browse/YARN-4169) | Fix racing condition of TestNodeStatusUpdaterForLabels |  Critical | test | Steve Loughran | Naganarasimha G R |
| [YARN-4300](https://issues.apache.org/jira/browse/YARN-4300) | [JDK8] Fix javadoc errors caused by wrong tags |  Blocker | build, documentation | Akira Ajisaka | Akira Ajisaka |
| [YARN-4302](https://issues.apache.org/jira/browse/YARN-4302) | SLS not able start due to NPE in SchedulerApplicationAttempt#getResourceUsageReport |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [HADOOP-12178](https://issues.apache.org/jira/browse/HADOOP-12178) | NPE during handling of SASL setup if problem with SASL resolver class |  Minor | ipc | Steve Loughran | Steve Loughran |
| [HADOOP-11685](https://issues.apache.org/jira/browse/HADOOP-11685) | StorageException complaining " no lease ID" during HBase distributed log splitting |  Major | tools | Duo Xu | Duo Xu |
| [HDFS-9231](https://issues.apache.org/jira/browse/HDFS-9231) | fsck doesn't list correct file path when Bad Replicas/Blocks are in a snapshot |  Major | snapshots | Xiao Chen | Xiao Chen |
| [HDFS-9302](https://issues.apache.org/jira/browse/HDFS-9302) | WebHDFS truncate throws NullPointerException if newLength is not provided |  Minor | webhdfs | Karthik Palaniappan | Jagadesh Kiran N |
| [YARN-4251](https://issues.apache.org/jira/browse/YARN-4251) | TestAMRMClientOnRMRestart#testAMRMClientOnAMRMTokenRollOverOnRMRestart is failing |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12519](https://issues.apache.org/jira/browse/HADOOP-12519) | hadoop-azure tests should avoid creating a metrics configuration file in the module root directory. |  Minor | fs/azure, test | Chris Nauroth | Chris Nauroth |
| [HDFS-9279](https://issues.apache.org/jira/browse/HDFS-9279) | Decomissioned capacity should not be considered for configured/used capacity |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [HDFS-9044](https://issues.apache.org/jira/browse/HDFS-9044) | Give Priority to FavouredNodes , before selecting nodes from FavouredNode's Node Group |  Major | . | J.Andreina | J.Andreina |
| [YARN-4130](https://issues.apache.org/jira/browse/YARN-4130) | Duplicate declaration of ApplicationId in RMAppManager#submitApplication method |  Trivial | resourcemanager | Kai Sasaki | Kai Sasaki |
| [YARN-4288](https://issues.apache.org/jira/browse/YARN-4288) | NodeManager restart should keep retrying to register to RM while connection exception happens during RM failed over. |  Critical | nodemanager | Junping Du | Junping Du |
| [MAPREDUCE-6515](https://issues.apache.org/jira/browse/MAPREDUCE-6515) | Update Application priority in AM side from AM-RM heartbeat |  Major | applicationmaster | Sunil G | Sunil G |
| [HDFS-9332](https://issues.apache.org/jira/browse/HDFS-9332) | Fix Precondition failures from NameNodeEditLogRoller while saving namespace |  Major | . | Andrew Wang | Andrew Wang |
| [YARN-4313](https://issues.apache.org/jira/browse/YARN-4313) | Race condition in MiniMRYarnCluster when getting history server address |  Major | . | Jian He | Jian He |
| [YARN-4312](https://issues.apache.org/jira/browse/YARN-4312) | TestSubmitApplicationWithRMHA fails on branch-2.7 and branch-2.6 as some of the test cases time out |  Major | . | Varun Saxena | Varun Saxena |
| [YARN-4320](https://issues.apache.org/jira/browse/YARN-4320) | TestJobHistoryEventHandler fails as AHS in MiniYarnCluster no longer binds to default port 8188 |  Major | . | Varun Saxena | Varun Saxena |
| [MAPREDUCE-6528](https://issues.apache.org/jira/browse/MAPREDUCE-6528) | Memory leak for HistoryFileManager.getJobSummary() |  Critical | jobhistoryserver | Junping Du | Junping Du |
| [MAPREDUCE-6451](https://issues.apache.org/jira/browse/MAPREDUCE-6451) | DistCp has incorrect chunkFilePath for multiple jobs when strategy is dynamic |  Major | distcp | Kuhu Shukla | Kuhu Shukla |
| [HADOOP-12533](https://issues.apache.org/jira/browse/HADOOP-12533) | Introduce FileNotFoundException in WASB for read and seek API |  Major | tools | Dushyanth | Dushyanth |
| [HADOOP-12508](https://issues.apache.org/jira/browse/HADOOP-12508) | delete fails with exception when lease is held on blob |  Blocker | fs/azure | Gaurav Kanade | Gaurav Kanade |
| [HDFS-9329](https://issues.apache.org/jira/browse/HDFS-9329) | TestBootstrapStandby#testRateThrottling is flaky because fsimage size is smaller than IO buffer size |  Minor | test | Zhe Zhang | Zhe Zhang |
| [HDFS-9313](https://issues.apache.org/jira/browse/HDFS-9313) | Possible NullPointerException in BlockManager if no excess replica can be chosen |  Major | . | Ming Ma | Ming Ma |
| [HADOOP-12542](https://issues.apache.org/jira/browse/HADOOP-12542) | TestDNS fails on Windows after HADOOP-12437. |  Major | net | Chris Nauroth | Chris Nauroth |
| [YARN-4326](https://issues.apache.org/jira/browse/YARN-4326) | Fix TestDistributedShell timeout as AHS in MiniYarnCluster no longer binds to default port 8188 |  Major | . | MENG DING | MENG DING |
| [HDFS-9289](https://issues.apache.org/jira/browse/HDFS-9289) | Make DataStreamer#block thread safe and verify genStamp in commitBlock |  Critical | . | Chang Li | Chang Li |
| [YARN-4127](https://issues.apache.org/jira/browse/YARN-4127) | RM fail with noAuth error if switched from failover mode to non-failover mode |  Major | resourcemanager | Jian He | Varun Saxena |
| [HDFS-9351](https://issues.apache.org/jira/browse/HDFS-9351) | checkNNStartup() need to be called when fsck calls FSNamesystem.getSnapshottableDirs() |  Major | namenode | Yongjun Zhang | Xiao Chen |
| [HADOOP-12296](https://issues.apache.org/jira/browse/HADOOP-12296) | when setnetgrent returns 0 in linux, exception should be thrown |  Major | . | Chang Li | Chang Li |
| [HDFS-9357](https://issues.apache.org/jira/browse/HDFS-9357) | NN UI renders icons of decommissioned DN incorrectly |  Critical | . | Archana T | Surendra Singh Lilhore |
| [HADOOP-12540](https://issues.apache.org/jira/browse/HADOOP-12540) | TestAzureFileSystemInstrumentation#testClientErrorMetrics fails intermittently due to assumption that a lease error will be thrown. |  Major | fs/azure, test | Chris Nauroth | Gaurav Kanade |
| [HDFS-9360](https://issues.apache.org/jira/browse/HDFS-9360) | Storage type usage isn't updated properly after file deletion |  Major | . | Ming Ma | Ming Ma |
| [HDFS-9378](https://issues.apache.org/jira/browse/HDFS-9378) | hadoop-hdfs-client tests do not write logs. |  Minor | test | Chris Nauroth | Chris Nauroth |
| [HDFS-4937](https://issues.apache.org/jira/browse/HDFS-4937) | ReplicationMonitor can infinite-loop in BlockPlacementPolicyDefault#chooseRandom() |  Major | namenode | Kihwal Lee | Kihwal Lee |
| [HDFS-9372](https://issues.apache.org/jira/browse/HDFS-9372) | Remove dead code in DataStorage.recoverTransitionRead |  Major | datanode | Duo Zhang | Duo Zhang |
| [HDFS-9384](https://issues.apache.org/jira/browse/HDFS-9384) | TestWebHdfsContentLength intermittently hangs and fails due to TCP conversation mismatch between client and server. |  Minor | test | Chris Nauroth | Chris Nauroth |
| [HDFS-6481](https://issues.apache.org/jira/browse/HDFS-6481) | DatanodeManager#getDatanodeStorageInfos() should check the length of storageIDs |  Minor | namenode | Ted Yu | Tsz Wo Nicholas Sze |
| [HDFS-9318](https://issues.apache.org/jira/browse/HDFS-9318) | considerLoad factor can be improved |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [HDFS-9236](https://issues.apache.org/jira/browse/HDFS-9236) | Missing sanity check for block size during block recovery |  Major | datanode | Tony Wu | Tony Wu |
| [HDFS-9394](https://issues.apache.org/jira/browse/HDFS-9394) | branch-2 hadoop-hdfs-client fails during FileSystem ServiceLoader initialization, because HftpFileSystem is missing. |  Critical | hdfs-client | Chris Nauroth | Mingliang Liu |
| [HADOOP-12526](https://issues.apache.org/jira/browse/HADOOP-12526) | [Branch-2] there are duplicate dependency definitions in pom's |  Major | build | Sangjin Lee | Sangjin Lee |
| [MAPREDUCE-5763](https://issues.apache.org/jira/browse/MAPREDUCE-5763) | Warn message about httpshuffle in NM logs |  Major | . | Sandy Ryza | Akira Ajisaka |
| [HDFS-9383](https://issues.apache.org/jira/browse/HDFS-9383) | TestByteArrayManager#testByteArrayManager fails |  Major | . | Kihwal Lee | Tsz Wo Nicholas Sze |
| [HDFS-9249](https://issues.apache.org/jira/browse/HDFS-9249) | NPE is thrown if an IOException is thrown in NameNode constructor |  Minor | namenode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-2261](https://issues.apache.org/jira/browse/HDFS-2261) | AOP unit tests are not getting compiled or run |  Minor | test | Giridharan Kesavan | Haohui Mai |
| [HDFS-9401](https://issues.apache.org/jira/browse/HDFS-9401) | Fix findbugs warnings in BlockRecoveryWorker |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12482](https://issues.apache.org/jira/browse/HADOOP-12482) | Race condition in JMX cache update |  Major | . | Tony Wu | Tony Wu |
| [HDFS-9364](https://issues.apache.org/jira/browse/HDFS-9364) | Unnecessary DNS resolution attempts when creating NameNodeProxies |  Major | ha, performance | Xiao Chen | Xiao Chen |
| [HADOOP-12560](https://issues.apache.org/jira/browse/HADOOP-12560) | Fix sprintf warnings in {{DomainSocket.c}} introduced by HADOOP-12344 |  Major | native | Colin P. McCabe | Mingliang Liu |
| [HDFS-9245](https://issues.apache.org/jira/browse/HDFS-9245) | Fix findbugs warnings in hdfs-nfs/WriteCtx |  Major | nfs | Mingliang Liu | Mingliang Liu |
| [YARN-4241](https://issues.apache.org/jira/browse/YARN-4241) | Fix typo of property name in yarn-default.xml |  Major | documentation | Anthony Rojas | Anthony Rojas |
| [MAPREDUCE-6533](https://issues.apache.org/jira/browse/MAPREDUCE-6533) | testDetermineCacheVisibilities of TestClientDistributedCacheManager is broken |  Major | . | Chang Li | Chang Li |
| [HDFS-9396](https://issues.apache.org/jira/browse/HDFS-9396) | Total files and directories on jmx and web UI on standby is uninitialized |  Blocker | . | Kihwal Lee | Kihwal Lee |
| [MAPREDUCE-6540](https://issues.apache.org/jira/browse/MAPREDUCE-6540) | TestMRTimelineEventHandling fails |  Major | test | Sangjin Lee | Sangjin Lee |
| [YARN-4347](https://issues.apache.org/jira/browse/YARN-4347) | Resource manager fails with Null pointer exception |  Major | yarn | Yesha Vora | Jian He |
| [HADOOP-12545](https://issues.apache.org/jira/browse/HADOOP-12545) | Hadoop javadoc has broken links for AccessControlList, ImpersonationProvider, DefaultImpersonationProvider, and DistCp |  Major | documentation | Mohammad Arshad | Mohammad Arshad |
| [YARN-4354](https://issues.apache.org/jira/browse/YARN-4354) | Public resource localization fails with NPE |  Blocker | nodemanager | Jason Lowe | Jason Lowe |
| [HDFS-9413](https://issues.apache.org/jira/browse/HDFS-9413) | getContentSummary() on standby should throw StandbyException |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9358](https://issues.apache.org/jira/browse/HDFS-9358) | TestNodeCount#testNodeCount timed out |  Major | test | Wei-Chiu Chuang | Masatake Iwasaki |
| [HDFS-9397](https://issues.apache.org/jira/browse/HDFS-9397) | Fix typo for readChecksum() LOG.warn in BlockSender.java |  Trivial | . | Enrique Flores | Enrique Flores |
| [HDFS-9400](https://issues.apache.org/jira/browse/HDFS-9400) | TestRollingUpgradeRollback fails on branch-2. |  Blocker | . | Chris Nauroth | Brahma Reddy Battula |
| [YARN-4367](https://issues.apache.org/jira/browse/YARN-4367) | SLS webapp doesn't load |  Major | scheduler-load-simulator | Karthik Kambatla | Karthik Kambatla |
| [HDFS-9431](https://issues.apache.org/jira/browse/HDFS-9431) | DistributedFileSystem#concat fails if the target path is relative. |  Major | hdfs-client | Kazuho Fujii | Kazuho Fujii |
| [YARN-2859](https://issues.apache.org/jira/browse/YARN-2859) | ApplicationHistoryServer binds to default port 8188 in MiniYARNCluster |  Critical | timelineserver | Hitesh Shah | Vinod Kumar Vavilapalli |
| [YARN-4374](https://issues.apache.org/jira/browse/YARN-4374) | RM capacity scheduler UI rounds user limit factor |  Major | capacityscheduler | Chang Li | Chang Li |
| [YARN-3769](https://issues.apache.org/jira/browse/YARN-3769) | Consider user limit when calculating total pending resource for preemption policy in Capacity Scheduler |  Major | capacityscheduler | Eric Payne | Eric Payne |
| [HDFS-9443](https://issues.apache.org/jira/browse/HDFS-9443) | Disabling HDFS client socket cache causes logging message printed to console for CLI commands. |  Trivial | hdfs-client | Chris Nauroth | Chris Nauroth |
| [HADOOP-11218](https://issues.apache.org/jira/browse/HADOOP-11218) | Add TLSv1.1,TLSv1.2 to KMS, HttpFS, SSLFactory |  Critical | kms | Robert Kanter | Vijay Singh |
| [HADOOP-12467](https://issues.apache.org/jira/browse/HADOOP-12467) | Respect user-defined JAVA\_LIBRARY\_PATH in Windows Hadoop scripts |  Minor | scripts | Radhey Shah | Radhey Shah |
| [HADOOP-12181](https://issues.apache.org/jira/browse/HADOOP-12181) | Fix intermittent test failure of TestZKSignerSecretProvider |  Minor | . | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-6885](https://issues.apache.org/jira/browse/HDFS-6885) | Fix wrong use of BytesWritable in FSEditLogOp#RenameOp |  Minor | namenode | Yi Liu | Yi Liu |
| [HADOOP-12098](https://issues.apache.org/jira/browse/HADOOP-12098) | Remove redundant test dependencies in Hadoop Archives |  Minor | . | Varun Saxena | Varun Saxena |
| [HDFS-7897](https://issues.apache.org/jira/browse/HDFS-7897) | Shutdown metrics when stopping JournalNode |  Major | . | zhouyingchao | zhouyingchao |
| [HADOOP-11149](https://issues.apache.org/jira/browse/HADOOP-11149) | Increase the timeout of TestZKFailoverController |  Major | test | Rajat Jain | Steve Loughran |
| [HADOOP-11677](https://issues.apache.org/jira/browse/HADOOP-11677) | Add cookie flags for logs and static contexts |  Major | . | nijel | nijel |
| [HDFS-9356](https://issues.apache.org/jira/browse/HDFS-9356) | Decommissioning node does not have Last Contact value in the UI |  Major | . | Archana T | Surendra Singh Lilhore |
| [HADOOP-12313](https://issues.apache.org/jira/browse/HADOOP-12313) | NPE in JvmPauseMonitor when calling stop() before start() |  Critical | . | Rohith Sharma K S | Gabor Liptak |
| [HDFS-9428](https://issues.apache.org/jira/browse/HDFS-9428) | Fix intermittent failure of TestDNFencing.testQueueingWithAppend |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-9435](https://issues.apache.org/jira/browse/HDFS-9435) | TestBlockRecovery#testRBWReplicas is failing intermittently |  Major | . | Rakesh R | Rakesh R |
| [HADOOP-12577](https://issues.apache.org/jira/browse/HADOOP-12577) | Bump up commons-collections version to 3.2.2 to address a security flaw |  Blocker | build, security | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4344](https://issues.apache.org/jira/browse/YARN-4344) | NMs reconnecting with changed capabilities can lead to wrong cluster resource calculations |  Critical | resourcemanager | Varun Vasudev | Varun Vasudev |
| [HADOOP-9822](https://issues.apache.org/jira/browse/HADOOP-9822) | create constant MAX\_CAPACITY in RetryCache rather than hard-coding 16 in RetryCache constructor |  Minor | . | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| [YARN-4298](https://issues.apache.org/jira/browse/YARN-4298) | Fix findbugs warnings in hadoop-yarn-common |  Minor | . | Varun Saxena | Sunil G |
| [YARN-4387](https://issues.apache.org/jira/browse/YARN-4387) | Fix typo in FairScheduler log message |  Minor | fairscheduler | Xin Wang | Xin Wang |
| [HDFS-6101](https://issues.apache.org/jira/browse/HDFS-6101) | TestReplaceDatanodeOnFailure fails occasionally |  Major | test | Arpit Agarwal | Wei-Chiu Chuang |
| [HDFS-8855](https://issues.apache.org/jira/browse/HDFS-8855) | Webhdfs client leaks active NameNode connections |  Major | webhdfs | Bob Hansen | Xiaobing Zhou |
| [HDFS-8335](https://issues.apache.org/jira/browse/HDFS-8335) | FSNamesystem should construct FSPermissionChecker only if permission is enabled |  Major | . | David Bryson | Gabor Liptak |
| [MAPREDUCE-5883](https://issues.apache.org/jira/browse/MAPREDUCE-5883) | "Total megabyte-seconds" in job counters is slightly misleading |  Minor | . | Nathan Roberts | Nathan Roberts |
| [YARN-4365](https://issues.apache.org/jira/browse/YARN-4365) | FileSystemNodeLabelStore should check for root dir existence on startup |  Major | resourcemanager | Jason Lowe | Kuhu Shukla |
| [HDFS-8807](https://issues.apache.org/jira/browse/HDFS-8807) | dfs.datanode.data.dir does not handle spaces between storageType and URI correctly |  Major | datanode | Anu Engineer | Anu Engineer |
| [HADOOP-12415](https://issues.apache.org/jira/browse/HADOOP-12415) | hdfs and nfs builds broken on -missing compile-time dependency on netty |  Major | nfs | Konstantin Boudnik | Tom Zeng |
| [MAPREDUCE-6553](https://issues.apache.org/jira/browse/MAPREDUCE-6553) | Replace '\u2b05' with '\<-' in rendering job configuration |  Minor | jobhistoryserver | Akira Ajisaka | Gabor Liptak |
| [HADOOP-12598](https://issues.apache.org/jira/browse/HADOOP-12598) | add XML namespace declarations for some hadoop/tools modules |  Minor | build, tools | Xin Wang | Xin Wang |
| [YARN-4380](https://issues.apache.org/jira/browse/YARN-4380) | TestResourceLocalizationService.testDownloadingResourcesOnContainerKill fails intermittently |  Major | test | Tsuyoshi Ozawa | Varun Saxena |
| [MAPREDUCE-6557](https://issues.apache.org/jira/browse/MAPREDUCE-6557) | Some tests in mapreduce-client-app are writing outside of target |  Blocker | build | Allen Wittenauer | Akira Ajisaka |
| [HDFS-9459](https://issues.apache.org/jira/browse/HDFS-9459) | hadoop-hdfs-native-client fails test build on Windows after transition to ctest. |  Blocker | build, test | Chris Nauroth | Chris Nauroth |
| [HDFS-9407](https://issues.apache.org/jira/browse/HDFS-9407) | TestFileTruncate fails with BindException |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9467](https://issues.apache.org/jira/browse/HDFS-9467) | Fix data race accessing writeLockHeldTimeStamp in FSNamesystem |  Major | namenode | Mingliang Liu | Mingliang Liu |
| [MAPREDUCE-6549](https://issues.apache.org/jira/browse/MAPREDUCE-6549) | multibyte delimiters with LineRecordReader cause duplicate records |  Major | mrv1, mrv2 | Dustin Cote | Wilfred Spiegelenburg |
| [MAPREDUCE-6550](https://issues.apache.org/jira/browse/MAPREDUCE-6550) | archive-logs tool changes log ownership to the Yarn user when using DefaultContainerExecutor |  Major | . | Robert Kanter | Robert Kanter |
| [HADOOP-12468](https://issues.apache.org/jira/browse/HADOOP-12468) | Partial group resolution failure should not result in user lockout |  Minor | security | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9426](https://issues.apache.org/jira/browse/HDFS-9426) | Rollingupgrade finalization is not backward compatible |  Blocker | . | Kihwal Lee | Kihwal Lee |
| [HADOOP-10406](https://issues.apache.org/jira/browse/HADOOP-10406) | TestIPC.testIpcWithReaderQueuing may fail |  Major | ipc | Tsz Wo Nicholas Sze | Xiao Chen |
| [HDFS-9470](https://issues.apache.org/jira/browse/HDFS-9470) | Encryption zone on root not loaded from fsimage after NN restart |  Critical | . | Xiao Chen | Xiao Chen |
| [HDFS-9336](https://issues.apache.org/jira/browse/HDFS-9336) | deleteSnapshot throws NPE when snapshotname is null |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12609](https://issues.apache.org/jira/browse/HADOOP-12609) | Fix intermittent failure of TestDecayRpcScheduler |  Minor | ipc, test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-6533](https://issues.apache.org/jira/browse/HDFS-6533) | TestBPOfferService#testBasicFunctionalitytest fails intermittently |  Major | datanode, hdfs-client | Yongjun Zhang | Wei-Chiu Chuang |
| [YARN-4398](https://issues.apache.org/jira/browse/YARN-4398) | Yarn recover functionality causes the cluster running slowly and the cluster usage rate is far below 100 |  Major | resourcemanager | NING DING | NING DING |
| [HDFS-9294](https://issues.apache.org/jira/browse/HDFS-9294) | DFSClient  deadlock when close file and failed to renew lease |  Blocker | hdfs-client | DENG FEI | Brahma Reddy Battula |
| [HADOOP-12565](https://issues.apache.org/jira/browse/HADOOP-12565) | Replace DSA with RSA for SSH key type in SingleCluster.md |  Minor | documentation | Alexander Veit | Mingliang Liu |
| [YARN-4408](https://issues.apache.org/jira/browse/YARN-4408) | NodeManager still reports negative running containers |  Major | nodemanager | Robert Kanter | Robert Kanter |
| [HDFS-9430](https://issues.apache.org/jira/browse/HDFS-9430) | Remove waitForLoadingFSImage since checkNNStartup has ensured image loaded and namenode started. |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4392](https://issues.apache.org/jira/browse/YARN-4392) | ApplicationCreatedEvent event time resets after RM restart/failover |  Critical | . | Xuan Gong | Naganarasimha G R |
| [YARN-4422](https://issues.apache.org/jira/browse/YARN-4422) | Generic AHS sometimes doesn't show started, node, or logs on App page |  Major | . | Eric Payne | Eric Payne |
| [YARN-4424](https://issues.apache.org/jira/browse/YARN-4424) | Fix deadlock in RMAppImpl |  Blocker | . | Yesha Vora | Jian He |
| [HADOOP-12617](https://issues.apache.org/jira/browse/HADOOP-12617) | SPNEGO authentication request to non-default realm gets default realm name inserted in target server principal |  Major | security | Matt Foley | Matt Foley |
| [YARN-4431](https://issues.apache.org/jira/browse/YARN-4431) | Not necessary to do unRegisterNM() if NM get stop due to failed to connect to RM |  Major | nodemanager | Junping Du | Junping Du |
| [YARN-4421](https://issues.apache.org/jira/browse/YARN-4421) | Remove dead code in RmAppImpl.RMAppRecoveredTransition |  Trivial | resourcemanager | Daniel Templeton | Daniel Templeton |
| [HADOOP-12618](https://issues.apache.org/jira/browse/HADOOP-12618) | NPE in TestSequenceFile |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4434](https://issues.apache.org/jira/browse/YARN-4434) | NodeManager Disk Checker parameter documentation is not correct |  Minor | documentation, nodemanager | Takashi Ohnishi | Weiwei Yang |
| [HADOOP-12602](https://issues.apache.org/jira/browse/HADOOP-12602) | TestMetricsSystemImpl#testQSize occasionally fail |  Major | test | Wei-Chiu Chuang | Masatake Iwasaki |
| [HDFS-9519](https://issues.apache.org/jira/browse/HDFS-9519) | Some coding improvement in SecondaryNameNode#main |  Major | namenode | Yongjun Zhang | Xiao Chen |
| [HDFS-9514](https://issues.apache.org/jira/browse/HDFS-9514) | TestDistributedFileSystem.testDFSClientPeerWriteTimeout failing; exception being swallowed |  Major | hdfs-client, test | Steve Loughran | Wei-Chiu Chuang |
| [HDFS-9535](https://issues.apache.org/jira/browse/HDFS-9535) | Newly completed blocks in IBR should not be considered under-replicated too quickly |  Major | namenode | Jing Zhao | Mingliang Liu |
| [YARN-4418](https://issues.apache.org/jira/browse/YARN-4418) | AM Resource Limit per partition can be updated to ResourceUsage as well |  Major | resourcemanager | Sunil G | Sunil G |
| [YARN-4403](https://issues.apache.org/jira/browse/YARN-4403) | (AM/NM/Container)LivelinessMonitor should use monotonic time when calculating period |  Critical | . | Junping Du | Junping Du |
| [YARN-4402](https://issues.apache.org/jira/browse/YARN-4402) | TestNodeManagerShutdown And TestNodeManagerResync fails with bind exception |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4439](https://issues.apache.org/jira/browse/YARN-4439) | Clarify NMContainerStatus#toString method. |  Major | . | Jian He | Jian He |
| [YARN-4440](https://issues.apache.org/jira/browse/YARN-4440) | FSAppAttempt#getAllowedLocalityLevelByTime should init the lastScheduler time |  Major | fairscheduler | Yiqun Lin | Yiqun Lin |
| [HDFS-9516](https://issues.apache.org/jira/browse/HDFS-9516) | truncate file fails with data dirs on multiple disks |  Major | datanode | Bogdan Raducanu | Plamen Jeliazkov |
| [HDFS-8894](https://issues.apache.org/jira/browse/HDFS-8894) | Set SO\_KEEPALIVE on DN server sockets |  Major | datanode | Nathan Roberts | Kanaka Kumar Avvaru |
| [YARN-4461](https://issues.apache.org/jira/browse/YARN-4461) | Redundant nodeLocalityDelay log in LeafQueue |  Trivial | capacityscheduler | Jason Lowe | Eric Payne |
| [YARN-4452](https://issues.apache.org/jira/browse/YARN-4452) | NPE when submit Unmanaged application |  Critical | . | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9565](https://issues.apache.org/jira/browse/HDFS-9565) | TestDistributedFileSystem.testLocatedFileStatusStorageIdsTypes is flaky due to race condition |  Minor | fs, test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4225](https://issues.apache.org/jira/browse/YARN-4225) | Add preemption status to yarn queue -status for capacity scheduler |  Minor | capacity scheduler, yarn | Eric Payne | Eric Payne |
| [HDFS-9515](https://issues.apache.org/jira/browse/HDFS-9515) | NPE when MiniDFSCluster#shutdown is invoked on uninitialized reference |  Minor | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9572](https://issues.apache.org/jira/browse/HDFS-9572) | Prevent DataNode log spam if a client connects on the data transfer port but sends no data. |  Major | datanode | Chris Nauroth | Chris Nauroth |
| [HDFS-9533](https://issues.apache.org/jira/browse/HDFS-9533) | seen\_txid in the shared edits directory is modified during bootstrapping |  Major | ha, namenode | Kihwal Lee | Kihwal Lee |
| [HDFS-9571](https://issues.apache.org/jira/browse/HDFS-9571) | Fix ASF Licence warnings in Jenkins reports |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9393](https://issues.apache.org/jira/browse/HDFS-9393) | After choosing favored nodes, choosing nodes for remaining replicas should go through BlockPlacementPolicy |  Major | . | J.Andreina | J.Andreina |
| [HDFS-9347](https://issues.apache.org/jira/browse/HDFS-9347) | Invariant assumption in TestQuorumJournalManager.shutdown() is wrong |  Major | test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12656](https://issues.apache.org/jira/browse/HADOOP-12656) | MiniKdc throws "address in use" BindException |  Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12636](https://issues.apache.org/jira/browse/HADOOP-12636) | Prevent ServiceLoader failure init for unused FileSystems |  Major | fs | Inigo Goiri | Inigo Goiri |
| [MAPREDUCE-6583](https://issues.apache.org/jira/browse/MAPREDUCE-6583) | Clarify confusing sentence in MapReduce tutorial document |  Minor | documentation | chris snow | Kai Sasaki |
| [HDFS-9505](https://issues.apache.org/jira/browse/HDFS-9505) | HDFS Architecture documentation needs to be refreshed. |  Major | documentation | Chris Nauroth | Masatake Iwasaki |
| [YARN-4454](https://issues.apache.org/jira/browse/YARN-4454) | NM to nodelabel mapping going wrong after RM restart |  Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-9580](https://issues.apache.org/jira/browse/HDFS-9580) | TestComputeInvalidateWork#testDatanodeReRegistration failed due to unexpected number of invalidate blocks. |  Major | datanode, namenode, test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4477](https://issues.apache.org/jira/browse/YARN-4477) | FairScheduler: Handle condition which can result in an infinite loop in attemptScheduling. |  Major | fairscheduler | Tao Jie | Tao Jie |
| [HDFS-9589](https://issues.apache.org/jira/browse/HDFS-9589) | Block files which have been hardlinked should be duplicated before the DataNode appends to the them |  Major | datanode | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9458](https://issues.apache.org/jira/browse/HDFS-9458) | TestBackupNode always binds to port 50070, which can cause bind failures. |  Major | test | Chris Nauroth | Xiao Chen |
| [YARN-4109](https://issues.apache.org/jira/browse/YARN-4109) | Exception on RM scheduler page loading with labels |  Minor | . | Bibin A Chundatt | Mohammad Shahid Khan |
| [MAPREDUCE-6419](https://issues.apache.org/jira/browse/MAPREDUCE-6419) | JobHistoryServer doesn't sort properly based on Job ID when Job id's exceed 9999 |  Major | webapps | Devaraj K | Mohammad Shahid Khan |
| [HDFS-9597](https://issues.apache.org/jira/browse/HDFS-9597) | BaseReplicationPolicyTest should update data node stats after adding a data node |  Blocker | datanode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12681](https://issues.apache.org/jira/browse/HADOOP-12681) | start-build-env.sh fails in branch-2 |  Blocker | build | Akira Ajisaka | Kengo Seki |
| [HDFS-7163](https://issues.apache.org/jira/browse/HDFS-7163) | WebHdfsFileSystem should retry reads according to the configured retry policy. |  Major | webhdfs | Eric Payne | Eric Payne |
| [HADOOP-12559](https://issues.apache.org/jira/browse/HADOOP-12559) | KMS connection failures should trigger TGT renewal |  Major | security | Zhe Zhang | Zhe Zhang |
| [MAPREDUCE-6574](https://issues.apache.org/jira/browse/MAPREDUCE-6574) | MR AM should print host of failed tasks. |  Major | . | Wangda Tan | Mohammad Shahid Khan |
| [MAPREDUCE-6589](https://issues.apache.org/jira/browse/MAPREDUCE-6589) | TestTaskLog outputs a log under directory other than target/test-dir |  Major | test | Akira Ajisaka | Akira Ajisaka |
| [YARN-4315](https://issues.apache.org/jira/browse/YARN-4315) | NaN in Queue percentage for cluster apps page |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-1382](https://issues.apache.org/jira/browse/YARN-1382) | Remove unusableRMNodesConcurrentSet (never used) in NodeListManager to get rid of memory leak |  Major | resourcemanager | Alejandro Abdelnur | Rohith Sharma K S |
| [HADOOP-12682](https://issues.apache.org/jira/browse/HADOOP-12682) | Fix TestKMS#testKMSRestart\* failure |  Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12608](https://issues.apache.org/jira/browse/HADOOP-12608) | Fix exception message in WASB when connecting with anonymous credential |  Major | tools | Dushyanth | Dushyanth |
| [YARN-4524](https://issues.apache.org/jira/browse/YARN-4524) | Cleanup AppSchedulingInfo |  Major | scheduler | Karthik Kambatla | Karthik Kambatla |
| [YARN-4510](https://issues.apache.org/jira/browse/YARN-4510) | Fix SLS startup failure caused by NPE |  Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| [MAPREDUCE-6593](https://issues.apache.org/jira/browse/MAPREDUCE-6593) | TestJobHistoryEventHandler.testTimelineEventHandling fails on trunk because of NPE |  Major | . | Tsuyoshi Ozawa | Naganarasimha G R |
| [HDFS-9445](https://issues.apache.org/jira/browse/HDFS-9445) | Datanode may deadlock while handling a bad volume |  Blocker | . | Kihwal Lee | Walter Su |
| [HADOOP-12658](https://issues.apache.org/jira/browse/HADOOP-12658) | Clear javadoc and check style issues around DomainSocket |  Trivial | . | Kai Zheng | Kai Zheng |
| [HADOOP-12604](https://issues.apache.org/jira/browse/HADOOP-12604) | Exception may be swallowed in KMSClientProvider |  Major | kms | Yongjun Zhang | Yongjun Zhang |
| [HDFS-9605](https://issues.apache.org/jira/browse/HDFS-9605) | Add links to failed volumes to explorer.html in HDFS Web UI |  Minor | . | Archana T | Archana T |
| [MAPREDUCE-6577](https://issues.apache.org/jira/browse/MAPREDUCE-6577) | MR AM unable to load native library without MR\_AM\_ADMIN\_USER\_ENV set |  Critical | mr-am | Sangjin Lee | Sangjin Lee |
| [HADOOP-12689](https://issues.apache.org/jira/browse/HADOOP-12689) | S3 filesystem operations stopped working correctly |  Major | tools | Matthew Paduano | Matthew Paduano |
| [YARN-4546](https://issues.apache.org/jira/browse/YARN-4546) | ResourceManager crash due to scheduling opportunity overflow |  Critical | resourcemanager | Jason Lowe | Jason Lowe |
| [HADOOP-12634](https://issues.apache.org/jira/browse/HADOOP-12634) | Change Lazy Rename Pending Operation Completion of WASB to address case of potential data loss due to partial copy |  Critical | . | Gaurav Kanade | Gaurav Kanade |
| [HDFS-9600](https://issues.apache.org/jira/browse/HDFS-9600) | do not check replication if the block is under construction |  Critical | . | Phil Yang | Phil Yang |
| [HDFS-9619](https://issues.apache.org/jira/browse/HDFS-9619) | SimulatedFSDataset sometimes can not find blockpool for the correct namenode |  Major | datanode, test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12675](https://issues.apache.org/jira/browse/HADOOP-12675) | Fix description about retention period in usage of expunge command |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-12613](https://issues.apache.org/jira/browse/HADOOP-12613) | TestFind.processArguments occasionally fails |  Major | test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [MAPREDUCE-6508](https://issues.apache.org/jira/browse/MAPREDUCE-6508) | TestNetworkedJob fails consistently due to delegation token changes on RM. |  Major | test | Rohith Sharma K S | Akira Ajisaka |
| [HDFS-9574](https://issues.apache.org/jira/browse/HDFS-9574) | Reduce client failures during datanode restart |  Major | . | Kihwal Lee | Kihwal Lee |
| [HDFS-9493](https://issues.apache.org/jira/browse/HDFS-9493) | Test o.a.h.hdfs.server.namenode.TestMetaSave fails in trunk |  Major | test | Mingliang Liu | Tony Wu |
| [HADOOP-12678](https://issues.apache.org/jira/browse/HADOOP-12678) | Handle empty rename pending metadata file during atomic rename in redo path |  Critical | fs/azure | madhumita chakraborty | madhumita chakraborty |
| [HADOOP-12590](https://issues.apache.org/jira/browse/HADOOP-12590) | TestCompressorDecompressor failing without stack traces |  Critical | test | Steve Loughran | John Zhuge |
| [HADOOP-12587](https://issues.apache.org/jira/browse/HADOOP-12587) | Hadoop AuthToken refuses to work without a maxinactive attribute in issued token |  Blocker | security | Steve Loughran | Benoy Antony |
| [HADOOP-12551](https://issues.apache.org/jira/browse/HADOOP-12551) | Introduce FileNotFoundException for WASB FileSystem API |  Major | tools | Dushyanth | Dushyanth |
| [MAPREDUCE-6068](https://issues.apache.org/jira/browse/MAPREDUCE-6068) | Illegal progress value warnings in map tasks |  Major | mrv2, task | Todd Lipcon | Binglin Chang |
| [HDFS-9639](https://issues.apache.org/jira/browse/HDFS-9639) | Inconsistent Logging in BootstrapStandby |  Minor | ha | BELUGA BEHR | Xiaobing Zhou |
| [HDFS-9584](https://issues.apache.org/jira/browse/HDFS-9584) | NPE in distcp when ssl configuration file does not exist in class path. |  Major | distcp | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-12584](https://issues.apache.org/jira/browse/HADOOP-12584) | Disable browsing the static directory in HttpServer2 |  Major | security | Robert Kanter | Robert Kanter |
| [YARN-4567](https://issues.apache.org/jira/browse/YARN-4567) | javadoc failing on java 8 |  Blocker | build | Steve Loughran | Steve Loughran |
| [YARN-4414](https://issues.apache.org/jira/browse/YARN-4414) | Nodemanager connection errors are retried at multiple levels |  Major | nodemanager | Jason Lowe | Chang Li |
| [HADOOP-12603](https://issues.apache.org/jira/browse/HADOOP-12603) | TestSymlinkLocalFSFileContext#testSetTimesSymlinkToDir occasionally fail |  Major | test | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4534](https://issues.apache.org/jira/browse/YARN-4534) | Remove the redundant symbol in yarn rmadmin help msg |  Trivial | . | Yiqun Lin | Yiqun Lin |
| [HADOOP-12700](https://issues.apache.org/jira/browse/HADOOP-12700) | Remove unused import in TestCompressorDecompressor.java |  Minor | . | John Zhuge | John Zhuge |
| [MAPREDUCE-6601](https://issues.apache.org/jira/browse/MAPREDUCE-6601) | Fix typo in Job#setUseNewAPI |  Trivial | . | Kai Sasaki | Kai Sasaki |
| [YARN-3446](https://issues.apache.org/jira/browse/YARN-3446) | FairScheduler headroom calculation should exclude nodes in the blacklist |  Major | fairscheduler | zhihai xu | zhihai xu |
| [HDFS-9648](https://issues.apache.org/jira/browse/HDFS-9648) | TestStartup.testImageChecksum is broken by HDFS-9569's message change |  Trivial | namenode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12706](https://issues.apache.org/jira/browse/HADOOP-12706) | TestLocalFsFCStatistics#testStatisticsThreadLocalDataCleanUp times out occasionally |  Major | test | Jason Lowe | Sangjin Lee |
| [YARN-4581](https://issues.apache.org/jira/browse/YARN-4581) | AHS writer thread leak makes RM crash while RM is recovering |  Major | resourcemanager | sandflee | sandflee |
| [MAPREDUCE-6554](https://issues.apache.org/jira/browse/MAPREDUCE-6554) | MRAppMaster servicestart failing  with NPE in MRAppMaster#parsePreviousJobHistory |  Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-4389](https://issues.apache.org/jira/browse/YARN-4389) | "yarn.am.blacklisting.enabled" and "yarn.am.blacklisting.disable-failure-threshold" should be app specific rather than a setting for whole YARN cluster |  Critical | applications | Junping Du | Sunil G |
| [HDFS-9612](https://issues.apache.org/jira/browse/HDFS-9612) | DistCp worker threads are not terminated after jobs are done. |  Major | distcp | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-12712](https://issues.apache.org/jira/browse/HADOOP-12712) | Fix some cmake plugin and native build warnings |  Minor | native | Colin P. McCabe | Colin P. McCabe |
| [YARN-4538](https://issues.apache.org/jira/browse/YARN-4538) | QueueMetrics pending  cores and memory metrics wrong |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-4596](https://issues.apache.org/jira/browse/YARN-4596) | SystemMetricPublisher should not swallow error messages from TimelineClient#putEntities |  Major | timelineserver | Li Lu | Li Lu |
| [YARN-4502](https://issues.apache.org/jira/browse/YARN-4502) | Fix two AM containers get allocated when AM restart |  Critical | . | Yesha Vora | Vinod Kumar Vavilapalli |
| [HDFS-9623](https://issues.apache.org/jira/browse/HDFS-9623) | Update example configuration of block state change log in log4j.properties |  Minor | logging | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-4565](https://issues.apache.org/jira/browse/YARN-4565) | When sizeBasedWeight enabled for FairOrderingPolicy in CapacityScheduler, Sometimes lead to situation where all queue resources consumed by AMs only |  Major | capacity scheduler, capacityscheduler | Karam Singh | Wangda Tan |
| [HADOOP-12356](https://issues.apache.org/jira/browse/HADOOP-12356) | Fix computing CPU usage statistics on Windows |  Major | util | Yunqi Zhang | Inigo Goiri |
| [HDFS-9661](https://issues.apache.org/jira/browse/HDFS-9661) | Deadlock in DN.FsDatasetImpl between moveBlockAcrossStorage and createRbw |  Major | datanode | ade | ade |
| [HDFS-9655](https://issues.apache.org/jira/browse/HDFS-9655) | NN should start JVM pause monitor before loading fsimage |  Critical | . | John Zhuge | John Zhuge |
| [YARN-4559](https://issues.apache.org/jira/browse/YARN-4559) | Make leader elector and zk store share the same curator client |  Major | . | Jian He | Jian He |
| [HADOOP-12605](https://issues.apache.org/jira/browse/HADOOP-12605) | Fix intermittent failure of TestIPC.testIpcWithReaderQueuing |  Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-9625](https://issues.apache.org/jira/browse/HDFS-9625) | set replication for empty file  failed when set storage policy |  Major | namenode | DENG FEI | DENG FEI |
| [HADOOP-12423](https://issues.apache.org/jira/browse/HADOOP-12423) | Handle failure of registering shutdownhook by ShutdownHookManager in static block |  Minor | fs | Abhishek Agarwal | Abhishek Agarwal |
| [HDFS-9634](https://issues.apache.org/jira/browse/HDFS-9634) | webhdfs client side exceptions don't provide enough details |  Major | webhdfs | Eric Payne | Eric Payne |
| [YARN-4608](https://issues.apache.org/jira/browse/YARN-4608) | Redundant code statement in WritingYarnApplications |  Minor | documentation | Kai Sasaki | Kai Sasaki |
| [HADOOP-7161](https://issues.apache.org/jira/browse/HADOOP-7161) | Remove unnecessary oro package from dependency management section |  Minor | build | Todd Lipcon | Sean Busbey |
| [YARN-4610](https://issues.apache.org/jira/browse/YARN-4610) | Reservations continue looking for one app causes other apps to starve |  Blocker | capacityscheduler | Jason Lowe | Jason Lowe |
| [HADOOP-12659](https://issues.apache.org/jira/browse/HADOOP-12659) | Incorrect usage of config parameters in token manager of KMS |  Major | security | Tianyin Xu | Mingliang Liu |
| [MAPREDUCE-6605](https://issues.apache.org/jira/browse/MAPREDUCE-6605) | Fix typos mapreduce.map.skip.proc.count.autoincr and mapreduce.reduce.skip.proc.count.autoincr in mapred-default.xml |  Major | documentation | Dong Zhen | Kai Sasaki |
| [YARN-4605](https://issues.apache.org/jira/browse/YARN-4605) | Spelling mistake in the help message of "yarn applicationattempt" command |  Trivial | client, yarn | Manjunath Ballur | Weiwei Yang |
| [HDFS-9682](https://issues.apache.org/jira/browse/HDFS-9682) | Fix a typo "aplication" in HttpFS document |  Trivial | documentation | Weiwei Yang | Weiwei Yang |
| [HADOOP-12730](https://issues.apache.org/jira/browse/HADOOP-12730) | Hadoop streaming -mapper and -reducer options are wrongly documented as required |  Major | documentation | DeepakVohra | Kengo Seki |
| [HDFS-8898](https://issues.apache.org/jira/browse/HDFS-8898) | Create API and command-line argument to get quota and quota usage without detailed content summary |  Major | fs | Joep Rottinghuis | Ming Ma |
| [YARN-4598](https://issues.apache.org/jira/browse/YARN-4598) | Invalid event: RESOURCE\_FAILED at CONTAINER\_CLEANEDUP\_AFTER\_KILL |  Major | nodemanager | tangshangwen | tangshangwen |
| [YARN-4592](https://issues.apache.org/jira/browse/YARN-4592) | Remove unused GetContainerStatus proto |  Minor | . | Chang Li | Chang Li |
| [YARN-4520](https://issues.apache.org/jira/browse/YARN-4520) | FinishAppEvent is leaked in leveldb if no app's container running on this node |  Major | nodemanager | sandflee | sandflee |
| [MAPREDUCE-6610](https://issues.apache.org/jira/browse/MAPREDUCE-6610) | JobHistoryEventHandler should not swallow timeline response |  Trivial | . | Li Lu | Li Lu |
| [HDFS-9690](https://issues.apache.org/jira/browse/HDFS-9690) | ClientProtocol.addBlock is not idempotent after HDFS-8071 |  Major | namenode | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HADOOP-12743](https://issues.apache.org/jira/browse/HADOOP-12743) | Fix git environment check during test-patch |  Major | . | Ray Chiang | Allen Wittenauer |
| [HADOOP-12735](https://issues.apache.org/jira/browse/HADOOP-12735) | core-default.xml misspells hadoop.workaround.non.threadsafe.getpwuid |  Minor | . | Ray Chiang | Ray Chiang |
| [MAPREDUCE-6619](https://issues.apache.org/jira/browse/MAPREDUCE-6619) | HADOOP\_CLASSPATH is overwritten in MR container |  Major | mrv2 | shanyu zhao | Junping Du |
| [HDFS-8999](https://issues.apache.org/jira/browse/HDFS-8999) | Allow a file to be closed with COMMITTED but not yet COMPLETE blocks. |  Major | namenode | Jitendra Nath Pandey | Tsz Wo Nicholas Sze |
| [MAPREDUCE-6595](https://issues.apache.org/jira/browse/MAPREDUCE-6595) | Fix findbugs warnings in OutputCommitter and FileOutputCommitter |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [MAPREDUCE-6563](https://issues.apache.org/jira/browse/MAPREDUCE-6563) | Streaming documentation contains a stray '%' character. |  Trivial | documentation | Chris Nauroth | Chris Nauroth |
| [YARN-4519](https://issues.apache.org/jira/browse/YARN-4519) | potential deadlock of CapacityScheduler between decrease container and assign containers |  Major | capacityscheduler | sandflee | MENG DING |
| [MAPREDUCE-6616](https://issues.apache.org/jira/browse/MAPREDUCE-6616) | Fail to create jobhistory file if there are some multibyte characters in the job name |  Major | jobhistoryserver | Akira Ajisaka | Kousuke Saruta |
| [YARN-4411](https://issues.apache.org/jira/browse/YARN-4411) | RMAppAttemptImpl#createApplicationAttemptReport throws IllegalArgumentException |  Major | resourcemanager | yarntime | Bibin A Chundatt |
| [YARN-4617](https://issues.apache.org/jira/browse/YARN-4617) | LeafQueue#pendingOrderingPolicy should always use fixed ordering policy instead of using same as active applications ordering policy |  Major | capacity scheduler | Rohith Sharma K S | Rohith Sharma K S |
| [YARN-4428](https://issues.apache.org/jira/browse/YARN-4428) | Redirect RM page to AHS page when AHS turned on and RM page is not available |  Major | . | Chang Li | Chang Li |
| [MAPREDUCE-6618](https://issues.apache.org/jira/browse/MAPREDUCE-6618) | YarnClientProtocolProvider leaking the YarnClient thread. |  Major | . | Xuan Gong | Xuan Gong |
| [HDFS-9210](https://issues.apache.org/jira/browse/HDFS-9210) | Fix some misuse of %n in VolumeScanner#printStats |  Minor | datanode | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-9701](https://issues.apache.org/jira/browse/HDFS-9701) | DN may deadlock when hot-swapping under load |  Major | . | Xiao Chen | Xiao Chen |
| [YARN-3102](https://issues.apache.org/jira/browse/YARN-3102) | Decommisioned Nodes not listed in Web UI |  Minor | resourcemanager | Bibin A Chundatt | Kuhu Shukla |
| [HDFS-9406](https://issues.apache.org/jira/browse/HDFS-9406) | FSImage may get corrupted after deleting snapshot |  Major | namenode | Stanislav Antic | Yongjun Zhang |
| [HDFS-9718](https://issues.apache.org/jira/browse/HDFS-9718) | HAUtil#getConfForOtherNodes should unset independent generic keys before initialize |  Major | namenode | DENG FEI | DENG FEI |
| [HDFS-9708](https://issues.apache.org/jira/browse/HDFS-9708) | FSNamesystem.initAuditLoggers() doesn't trim classnames |  Minor | fs | Steve Loughran | Mingliang Liu |
| [MAPREDUCE-6621](https://issues.apache.org/jira/browse/MAPREDUCE-6621) | Memory Leak in JobClient#submitJobInternal() |  Major | . | Xuan Gong | Xuan Gong |
| [HADOOP-12755](https://issues.apache.org/jira/browse/HADOOP-12755) | Fix typo in defaultFS warning message |  Trivial | . | Andrew Wang | Andrew Wang |
| [HDFS-9739](https://issues.apache.org/jira/browse/HDFS-9739) | DatanodeStorage.isValidStorageId() is broken |  Critical | hdfs-client | Kihwal Lee | Mingliang Liu |
| [HDFS-9740](https://issues.apache.org/jira/browse/HDFS-9740) | Use a reasonable limit in DFSTestUtil.waitForMetric() |  Major | test | Kihwal Lee | Chang Li |
| [HADOOP-12761](https://issues.apache.org/jira/browse/HADOOP-12761) | incremental maven build is not really incremental |  Minor | build | Sangjin Lee | Sangjin Lee |
| [HDFS-9748](https://issues.apache.org/jira/browse/HDFS-9748) | When addExpectedReplicasToPending is called twice, pendingReplications should avoid duplication |  Minor | . | Walter Su | Walter Su |
| [HDFS-9730](https://issues.apache.org/jira/browse/HDFS-9730) | Storage ID update does not happen when there is a layout change |  Major | datanode | Kihwal Lee | Tsz Wo Nicholas Sze |
| [HDFS-9724](https://issues.apache.org/jira/browse/HDFS-9724) | Degraded performance in WebHDFS listing as it does not reuse ObjectMapper |  Critical | performance | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-12766](https://issues.apache.org/jira/browse/HADOOP-12766) | The default value of "hadoop.workaround.non.threadsafe.getpwuid" is different between core-default.xml and NativeIO.java |  Minor | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-9761](https://issues.apache.org/jira/browse/HDFS-9761) | Rebalancer sleeps too long between iterations |  Blocker | balancer & mover | Adrian Bridgett | Mingliang Liu |
| [HDFS-9713](https://issues.apache.org/jira/browse/HDFS-9713) | DataXceiver#copyBlock should return if block is pinned |  Major | datanode | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-12773](https://issues.apache.org/jira/browse/HADOOP-12773) | HBase classes fail to load with client/job classloader enabled |  Major | util | Sangjin Lee | Sangjin Lee |
| [HDFS-9777](https://issues.apache.org/jira/browse/HDFS-9777) | Fix typos in DFSAdmin command line and documentation |  Trivial | hdfs-client | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9784](https://issues.apache.org/jira/browse/HDFS-9784) | Example usage is not correct in Transparent Encryption document |  Major | documentation | Takashi Ohnishi | Takashi Ohnishi |
| [HDFS-9752](https://issues.apache.org/jira/browse/HDFS-9752) | Permanent write failures may happen to slow writers during datanode rolling upgrades |  Critical | . | Kihwal Lee | Walter Su |
| [HDFS-9760](https://issues.apache.org/jira/browse/HDFS-9760) | WebHDFS AuthFilter cannot be configured with custom AltKerberos auth handler |  Major | webhdfs | Ryan Sasson | Ryan Sasson |
| [HDFS-9779](https://issues.apache.org/jira/browse/HDFS-9779) | TestReplicationPolicyWithNodeGroup NODE variable picks wrong rack value |  Minor | test | Kuhu Shukla | Kuhu Shukla |
| [HADOOP-12792](https://issues.apache.org/jira/browse/HADOOP-12792) | TestUserGroupInformation#testGetServerSideGroups fails in chroot |  Minor | security, test | Eric Badger | Eric Badger |
| [HDFS-9788](https://issues.apache.org/jira/browse/HDFS-9788) | Incompatible tag renumbering in HeartbeatResponseProto |  Blocker | rolling upgrades | Andrew Wang | Andrew Wang |
| [HADOOP-12795](https://issues.apache.org/jira/browse/HADOOP-12795) | KMS does not log detailed stack trace for unexpected errors. |  Major | kms | Chris Nauroth | Chris Nauroth |
| [HADOOP-12699](https://issues.apache.org/jira/browse/HADOOP-12699) | TestKMS#testKMSProvider intermittently fails during 'test rollover draining' |  Major | . | Xiao Chen | Xiao Chen |
| [HDFS-9790](https://issues.apache.org/jira/browse/HDFS-9790) | HDFS Balancer should exit with a proper message if upgrade is not finalized |  Major | . | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-9801](https://issues.apache.org/jira/browse/HDFS-9801) | ReconfigurableBase should update the cached configuration |  Major | datanode | Arpit Agarwal | Arpit Agarwal |
| [HADOOP-12780](https://issues.apache.org/jira/browse/HADOOP-12780) | During WASB atomic rename handle crash when one directory has been renamed but not file under it. |  Critical | fs/azure | madhumita chakraborty | madhumita chakraborty |
| [HADOOP-12589](https://issues.apache.org/jira/browse/HADOOP-12589) | Fix intermittent test failure of TestCopyPreserveFlag |  Major | test | Tsuyoshi Ozawa | Masatake Iwasaki |
| [HADOOP-12786](https://issues.apache.org/jira/browse/HADOOP-12786) | "hadoop key" command usage is not documented |  Major | documentation | Akira Ajisaka | Xiao Chen |
| [HDFS-9765](https://issues.apache.org/jira/browse/HDFS-9765) | TestBlockScanner#testVolumeIteratorWithCaching fails intermittently |  Major | test | Mingliang Liu | Akira Ajisaka |
| [HDFS-9456](https://issues.apache.org/jira/browse/HDFS-9456) | BlockPlacementPolicyWithNodeGroup should override verifyBlockPlacement |  Major | . | Junping Du | Xiaobing Zhou |
| [HADOOP-12810](https://issues.apache.org/jira/browse/HADOOP-12810) | FileSystem#listLocatedStatus causes unnecessary RPC calls |  Major | fs, fs/s3 | Ryan Blue | Ryan Blue |
| [MAPREDUCE-6341](https://issues.apache.org/jira/browse/MAPREDUCE-6341) | Fix typo in mapreduce tutorial |  Trivial | . | John Michael Luy | John Michael Luy |
| [HADOOP-12787](https://issues.apache.org/jira/browse/HADOOP-12787) | KMS SPNEGO sequence does not work with WEBHDFS |  Major | kms, security | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-9815](https://issues.apache.org/jira/browse/HDFS-9815) | Move o.a.h.fs.Hdfs to hadoop-hdfs-client |  Blocker | . | Haohui Mai | Vinayakumar B |
| [HDFS-9799](https://issues.apache.org/jira/browse/HDFS-9799) | Reimplement getCurrentTrashDir to remove incompatibility |  Blocker | . | Zhe Zhang | Zhe Zhang |
| [YARN-4654](https://issues.apache.org/jira/browse/YARN-4654) | Yarn node label CLI should parse "=" correctly when trying to remove all labels on a node |  Major | . | Wangda Tan | Naganarasimha G R |
| [HDFS-6832](https://issues.apache.org/jira/browse/HDFS-6832) | Fix the usage of 'hdfs namenode' command |  Minor | . | Akira Ajisaka | Manjunath Ballur |
| [HDFS-8923](https://issues.apache.org/jira/browse/HDFS-8923) | Add -source flag to balancer usage message |  Trivial | balancer & mover, documentation | Chris Trezzo | Chris Trezzo |
| [HDFS-9764](https://issues.apache.org/jira/browse/HDFS-9764) | DistCp doesn't print value for several arguments including -numListstatusThreads |  Minor | distcp | Yongjun Zhang | Wei-Chiu Chuang |
| [MAPREDUCE-6637](https://issues.apache.org/jira/browse/MAPREDUCE-6637) | Testcase Failure : TestFileInputFormat.testSplitLocationInfo |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9839](https://issues.apache.org/jira/browse/HDFS-9839) | Reduce verbosity of processReport logging |  Major | namenode | Arpit Agarwal | Arpit Agarwal |
| [HDFS-7452](https://issues.apache.org/jira/browse/HDFS-7452) | skip StandbyException log for getCorruptFiles() |  Minor | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4707](https://issues.apache.org/jira/browse/YARN-4707) | Remove the extra char (\>) from SecureContainer.md |  Major | documentation | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4386](https://issues.apache.org/jira/browse/YARN-4386) | refreshNodesGracefully() should send recommission event to active RMNodes only |  Minor | graceful | Kuhu Shukla | Kuhu Shukla |
| [HDFS-9842](https://issues.apache.org/jira/browse/HDFS-9842) | dfs.datanode.balance.bandwidthPerSec should accept friendly size units |  Minor | balancer & mover | Yiqun Lin | Yiqun Lin |
| [YARN-4709](https://issues.apache.org/jira/browse/YARN-4709) | NMWebServices produces incorrect JSON for containers |  Critical | . | Varun Saxena | Varun Saxena |
| [MAPREDUCE-6635](https://issues.apache.org/jira/browse/MAPREDUCE-6635) | Unsafe long to int conversion in UncompressedSplitLineReader and IndexOutOfBoundsException |  Critical | . | Sergey Shelukhin | Junping Du |
| [HDFS-9549](https://issues.apache.org/jira/browse/HDFS-9549) | TestCacheDirectives#testExceedsCapacity is flaky |  Major | . | Wei-Chiu Chuang | Xiao Chen |
| [YARN-2046](https://issues.apache.org/jira/browse/YARN-2046) | Out of band heartbeats are sent only on container kill and possibly too early |  Major | nodemanager | Jason Lowe | Ming Ma |
| [HDFS-9844](https://issues.apache.org/jira/browse/HDFS-9844) | Correct path creation in getTrashRoot to handle root dir |  Blocker | encryption | Zhe Zhang | Zhe Zhang |
| [YARN-4722](https://issues.apache.org/jira/browse/YARN-4722) | AsyncDispatcher logs redundant event queue sizes |  Major | . | Jason Lowe | Jason Lowe |
| [HADOOP-12716](https://issues.apache.org/jira/browse/HADOOP-12716) | KerberosAuthenticator#doSpnegoSequence use incorrect class to determine isKeyTab in JDK8 |  Major | security | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-9855](https://issues.apache.org/jira/browse/HDFS-9855) | Modify TestAuditLoggerWithCommands to workaround the absence of HDFS-8332 |  Major | test | Kuhu Shukla | Kuhu Shukla |
| [YARN-4723](https://issues.apache.org/jira/browse/YARN-4723) | NodesListManager$UnknownNodeId ClassCastException |  Critical | resourcemanager | Jason Lowe | Kuhu Shukla |
| [HADOOP-12849](https://issues.apache.org/jira/browse/HADOOP-12849) | TestSymlinkLocalFSFileSystem fails intermittently |  Major | test | Mingliang Liu | Mingliang Liu |
| [HADOOP-12831](https://issues.apache.org/jira/browse/HADOOP-12831) | LocalFS/FSOutputSummer NPEs in constructor if bytes per checksum  set to 0 |  Minor | fs | Steve Loughran | Mingliang Liu |
| [HADOOP-12846](https://issues.apache.org/jira/browse/HADOOP-12846) | Credential Provider Recursive Dependencies |  Major | . | Larry McCay | Larry McCay |
| [HDFS-9864](https://issues.apache.org/jira/browse/HDFS-9864) | Correct reference for RENEWDELEGATIONTOKEN and CANCELDELEGATIONTOKEN in webhdfs doc |  Major | documentation | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12622](https://issues.apache.org/jira/browse/HADOOP-12622) | RetryPolicies (other than FailoverOnNetworkExceptionRetry) should put on retry failed reason or the log from RMProxy's retry could be very misleading. |  Critical | auto-failover | Junping Du | Junping Du |
| [YARN-4748](https://issues.apache.org/jira/browse/YARN-4748) | ApplicationHistoryManagerOnTimelineStore should not swallow exceptions on generateApplicationReport |  Major | timelineserver | Li Lu | Li Lu |
| [HADOOP-12851](https://issues.apache.org/jira/browse/HADOOP-12851) | S3AFileSystem Uptake of ProviderUtils.excludeIncompatibleCredentialProviders |  Major | fs/s3 | Larry McCay | Larry McCay |
| [HADOOP-12843](https://issues.apache.org/jira/browse/HADOOP-12843) | Fix findbugs warnings in hadoop-common (branch-2) |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-9870](https://issues.apache.org/jira/browse/HDFS-9870) | Remove unused imports from DFSUtil |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-8791](https://issues.apache.org/jira/browse/HDFS-8791) | block ID-based DN storage layout can be very slow for datanode on ext4 |  Blocker | datanode | Nathan Roberts | Chris Trezzo |
| [HDFS-9880](https://issues.apache.org/jira/browse/HDFS-9880) | TestDatanodeRegistration fails occasionally |  Major | test | Kihwal Lee | Kihwal Lee |
| [HDFS-9881](https://issues.apache.org/jira/browse/HDFS-9881) | DistributedFileSystem#getTrashRoot returns incorrect path for encryption zones |  Critical | . | Andrew Wang | Andrew Wang |
| [HDFS-9766](https://issues.apache.org/jira/browse/HDFS-9766) | TestDataNodeMetrics#testDataNodeTimeSpend fails intermittently |  Major | test | Mingliang Liu | Xiao Chen |
| [HDFS-9851](https://issues.apache.org/jira/browse/HDFS-9851) | Name node throws NPE when setPermission is called on a path that does not exist |  Critical | namenode | David Yan | Brahma Reddy Battula |
| [HDFS-9886](https://issues.apache.org/jira/browse/HDFS-9886) | Configuration properties for hedged read is broken |  Blocker | . | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-12870](https://issues.apache.org/jira/browse/HADOOP-12870) | Fix typo admininistration in CommandsManual.md |  Minor | documentation | Akira Ajisaka | John Zhuge |
| [HDFS-9048](https://issues.apache.org/jira/browse/HDFS-9048) | DistCp documentation is out-of-dated |  Major | . | Haohui Mai | Daisuke Kobayashi |
| [HADOOP-12871](https://issues.apache.org/jira/browse/HADOOP-12871) | Fix dead link to NativeLibraries.html in CommandsManual.md |  Minor | documentation | Akira Ajisaka | Brahma Reddy Battula |
| [HADOOP-12872](https://issues.apache.org/jira/browse/HADOOP-12872) | Fix formatting in ServiceLevelAuth.md |  Trivial | documentation | Akira Ajisaka | Brahma Reddy Battula |
| [MAPREDUCE-4785](https://issues.apache.org/jira/browse/MAPREDUCE-4785) | TestMRApp occasionally fails |  Major | mrv2, test | Jason Lowe | Haibo Chen |
| [HADOOP-12717](https://issues.apache.org/jira/browse/HADOOP-12717) | NPE when trying to rename a directory in Windows Azure Storage FileSystem |  Blocker | . | Robert Yokota | Robert Yokota |
| [YARN-4763](https://issues.apache.org/jira/browse/YARN-4763) | RMApps Page crashes with NPE |  Major | webapp | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-4761](https://issues.apache.org/jira/browse/YARN-4761) | NMs reconnecting with changed capabilities can lead to wrong cluster resource calculations on fair scheduler |  Major | fairscheduler | Sangjin Lee | Sangjin Lee |
| [YARN-4744](https://issues.apache.org/jira/browse/YARN-4744) | Too many signal to container failure in case of LCE |  Major | . | Bibin A Chundatt | Sidharta Seethana |
| [YARN-4760](https://issues.apache.org/jira/browse/YARN-4760) | proxy redirect to history server uses wrong URL |  Major | webapp | Jason Lowe | Eric Badger |
| [HDFS-9865](https://issues.apache.org/jira/browse/HDFS-9865) | TestBlockReplacement fails intermittently in trunk |  Major | test | Yiqun Lin | Yiqun Lin |
| [HDFS-9812](https://issues.apache.org/jira/browse/HDFS-9812) | Streamer threads leak if failure happens when closing DFSOutputStream |  Major | hdfs-client | Yiqun Lin | Yiqun Lin |
| [HADOOP-12688](https://issues.apache.org/jira/browse/HADOOP-12688) | Fix deadlinks in Compatibility.md |  Major | documentation | Akira Ajisaka | Gabor Liptak |
| [HADOOP-12903](https://issues.apache.org/jira/browse/HADOOP-12903) | IPC Server should allow suppressing exception logging by type, not log 'server too busy' messages |  Major | ipc | Arpit Agarwal | Arpit Agarwal |
| [HDFS-9934](https://issues.apache.org/jira/browse/HDFS-9934) | ReverseXML oiv processor should bail out if the XML file's layoutVersion doesn't match oiv's |  Major | tools | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9933](https://issues.apache.org/jira/browse/HDFS-9933) | ReverseXML should be capitalized in oiv usage message |  Minor | tools | Colin P. McCabe | Colin P. McCabe |
| [HDFS-9953](https://issues.apache.org/jira/browse/HDFS-9953) | Download File from UI broken after pagination |  Blocker | namenode | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-9904](https://issues.apache.org/jira/browse/HDFS-9904) | testCheckpointCancellationDuringUpload occasionally fails |  Major | test | Kihwal Lee | Yiqun Lin |
| [MAPREDUCE-6579](https://issues.apache.org/jira/browse/MAPREDUCE-6579) | JobStatus#getFailureInfo should not output diagnostic information when the job is running |  Blocker | test | Rohith Sharma K S | Akira Ajisaka |
| [MAPREDUCE-6645](https://issues.apache.org/jira/browse/MAPREDUCE-6645) | TestWordStats outputs logs under directories other than target/test-dir |  Major | test | Akira Ajisaka | Gabor Liptak |
| [HDFS-9874](https://issues.apache.org/jira/browse/HDFS-9874) | Long living DataXceiver threads cause volume shutdown to block. |  Critical | datanode | Rushabh S Shah | Rushabh S Shah |
| [HDFS-3677](https://issues.apache.org/jira/browse/HDFS-3677) | dfs.namenode.edits.dir.required missing from hdfs-default.xml |  Major | documentation, namenode | Todd Lipcon | Mark Yang |
| [HDFS-7166](https://issues.apache.org/jira/browse/HDFS-7166) | SbNN Web UI shows #Under replicated blocks and #pending deletion blocks |  Major | ha | Juan Yu | Wei-Chiu Chuang |
| [YARN-4686](https://issues.apache.org/jira/browse/YARN-4686) | MiniYARNCluster.start() returns before cluster is completely started |  Major | test | Rohith Sharma K S | Eric Badger |
| [MAPREDUCE-6363](https://issues.apache.org/jira/browse/MAPREDUCE-6363) | [NNBench] Lease mismatch error when running with multiple mappers |  Critical | benchmarks | Brahma Reddy Battula | Bibin A Chundatt |
| [HDFS-10189](https://issues.apache.org/jira/browse/HDFS-10189) | PacketResponder#toString should include the downstreams for PacketResponderType.HAS\_DOWNSTREAM\_IN\_PIPELINE |  Minor | datanode | Joe Pallas | Joe Pallas |
| [MAPREDUCE-6580](https://issues.apache.org/jira/browse/MAPREDUCE-6580) | Test failure : TestMRJobsWithProfiler |  Major | . | Rohith Sharma K S | Eric Badger |
| [MAPREDUCE-6656](https://issues.apache.org/jira/browse/MAPREDUCE-6656) | [NNBench] OP\_DELETE operation isn't working after MAPREDUCE-6363 |  Blocker | . | J.Andreina | J.Andreina |
| [HDFS-10193](https://issues.apache.org/jira/browse/HDFS-10193) | fuse\_dfs segfaults if uid cannot be resolved to a username |  Major | fuse-dfs | John Thiltges | John Thiltges |
| [HDFS-10199](https://issues.apache.org/jira/browse/HDFS-10199) | Unit tests TestCopyFiles, TestDistCh, TestLogalyzer under org.apache.hadoop.tools are failing |  Minor | . | Tibor Kiss | Tibor Kiss |
| [YARN-4820](https://issues.apache.org/jira/browse/YARN-4820) | ResourceManager web redirects in HA mode drops query parameters |  Major | . | Varun Vasudev | Varun Vasudev |
| [YARN-4850](https://issues.apache.org/jira/browse/YARN-4850) | test-fair-scheduler.xml isn't valid xml |  Blocker | fairscheduler, test | Allen Wittenauer | Yufei Gu |
| [HADOOP-12962](https://issues.apache.org/jira/browse/HADOOP-12962) | KMS key names are incorrectly encoded when creating key |  Major | . | Xiao Chen | Xiao Chen |
| [HADOOP-12958](https://issues.apache.org/jira/browse/HADOOP-12958) | PhantomReference for filesystem statistics can trigger OOM |  Major | . | Jason Lowe | Sangjin Lee |
| [HADOOP-12873](https://issues.apache.org/jira/browse/HADOOP-12873) | Remove MRv1 terms from HttpAuthentication.md |  Major | documentation | Akira Ajisaka | Brahma Reddy Battula |
| [HDFS-10182](https://issues.apache.org/jira/browse/HDFS-10182) | Hedged read might overwrite user's buf |  Major | . | zhouyingchao | zhouyingchao |
| [YARN-4773](https://issues.apache.org/jira/browse/YARN-4773) | Log aggregation performs extraneous filesystem operations when rolling log aggregation is disabled |  Minor | nodemanager | Jason Lowe | Jun Gong |
| [MAPREDUCE-6662](https://issues.apache.org/jira/browse/MAPREDUCE-6662) | Clear ASF Warnings on test data files |  Minor | . | Vinayakumar B | Vinayakumar B |
| [HDFS-9871](https://issues.apache.org/jira/browse/HDFS-9871) | "Bytes Being Moved" -ve(-1 B) when cluster was already balanced. |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-4863](https://issues.apache.org/jira/browse/YARN-4863) | AHS Security login should be in serviceInit() instead of serviceStart() |  Major | timelineserver | Junping Du | Junping Du |
| [HDFS-10197](https://issues.apache.org/jira/browse/HDFS-10197) | TestFsDatasetCache failing intermittently due to timeout |  Major | test | Yiqun Lin | Yiqun Lin |
| [HDFS-9478](https://issues.apache.org/jira/browse/HDFS-9478) | Reason for failing ipc.FairCallQueue contruction should be thrown |  Minor | . | Archana T | Ajith S |
| [HDFS-10228](https://issues.apache.org/jira/browse/HDFS-10228) | TestHDFSCLI fails |  Major | test | Akira Ajisaka | Akira Ajisaka |
| [YARN-4865](https://issues.apache.org/jira/browse/YARN-4865) | Track Reserved resources in ResourceUsage and QueueCapacities |  Major | resourcemanager | Sunil G | Sunil G |
| [HADOOP-12972](https://issues.apache.org/jira/browse/HADOOP-12972) | Lz4Compressor#getLibraryName returns the wrong version number |  Trivial | native | John Zhuge | Colin P. McCabe |
| [HDFS-5177](https://issues.apache.org/jira/browse/HDFS-5177) | blocksScheduled  count should be decremented for abandoned blocks |  Major | namenode | Vinayakumar B | Vinayakumar B |
| [HDFS-10223](https://issues.apache.org/jira/browse/HDFS-10223) | peerFromSocketAndKey performs SASL exchange before setting connection timeouts |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HDFS-10221](https://issues.apache.org/jira/browse/HDFS-10221) | Add .json to the rat exclusions |  Blocker | build | Ming Ma | Ming Ma |
| [HADOOP-12902](https://issues.apache.org/jira/browse/HADOOP-12902) | JavaDocs for SignerSecretProvider are out-of-date in AuthenticationFilter |  Major | documentation | Robert Kanter | Gabor Liptak |
| [YARN-4183](https://issues.apache.org/jira/browse/YARN-4183) | Clarify the behavior of timeline service config properties |  Major | . | Mit Desai | Naganarasimha G R |
| [HDFS-10253](https://issues.apache.org/jira/browse/HDFS-10253) | Fix TestRefreshCallQueue failure. |  Major | . | Brahma Reddy Battula | Xiaoyu Yao |
| [YARN-4746](https://issues.apache.org/jira/browse/YARN-4746) | yarn web services should convert parse failures of appId, appAttemptId and containerId to 400 |  Minor | webapp | Steve Loughran | Bibin A Chundatt |
| [HDFS-9599](https://issues.apache.org/jira/browse/HDFS-9599) | TestDecommissioningStatus.testDecommissionStatus occasionally fails |  Major | namenode | Wei-Chiu Chuang | Yiqun Lin |
| [YARN-4706](https://issues.apache.org/jira/browse/YARN-4706) | UI Hosting Configuration in TimelineServer doc is broken |  Critical | documentation | Akira Ajisaka | Akira Ajisaka |
| [HDFS-10178](https://issues.apache.org/jira/browse/HDFS-10178) | Permanent write failures can happen if pipeline recoveries occur for the first packet |  Critical | . | Kihwal Lee | Kihwal Lee |
| [HDFS-8496](https://issues.apache.org/jira/browse/HDFS-8496) | Calling stopWriter() with FSDatasetImpl lock held may block other threads |  Major | . | zhouyingchao | Colin P. McCabe |
| [HDFS-9917](https://issues.apache.org/jira/browse/HDFS-9917) | IBR accumulate more objects when SNN was down for sometime. |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10239](https://issues.apache.org/jira/browse/HDFS-10239) | Fsshell mv fails if port usage doesn't match in src and destination paths |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [YARN-4893](https://issues.apache.org/jira/browse/YARN-4893) | Fix some intermittent test failures in TestRMAdminService |  Blocker | . | Junping Du | Brahma Reddy Battula |
| [YARN-4916](https://issues.apache.org/jira/browse/YARN-4916) | TestNMProxy.tesNMProxyRPCRetry fails. |  Minor | . | Tibor Kiss | Tibor Kiss |
| [YARN-4915](https://issues.apache.org/jira/browse/YARN-4915) | Fix typo in YARN Secure Containers documentation |  Trivial | documentation, yarn | Takashi Ohnishi | Takashi Ohnishi |
| [YARN-4917](https://issues.apache.org/jira/browse/YARN-4917) | Fix typos in documentation of Capacity Scheduler. |  Minor | documentation | Takashi Ohnishi | Takashi Ohnishi |
| [HDFS-10261](https://issues.apache.org/jira/browse/HDFS-10261) | TestBookKeeperHACheckpoints doesn't handle ephemeral HTTP ports |  Major | . | Eric Badger | Eric Badger |
| [YARN-4699](https://issues.apache.org/jira/browse/YARN-4699) | Scheduler UI and REST o/p is not in sync when -replaceLabelsOnNode is used to change label of a node |  Critical | capacity scheduler | Sunil G | Sunil G |
| [HADOOP-12022](https://issues.apache.org/jira/browse/HADOOP-12022) | fix site -Pdocs -Pdist in hadoop-project-dist; cleanout remaining forrest bits |  Blocker | build | Allen Wittenauer | Allen Wittenauer |
| [MAPREDUCE-6670](https://issues.apache.org/jira/browse/MAPREDUCE-6670) | TestJobListCache#testEviction sometimes fails on Windows with timeout |  Minor | test | Gergely Novák | Gergely Novák |
| [HDFS-6520](https://issues.apache.org/jira/browse/HDFS-6520) | hdfs fsck -move passes invalid length value when creating BlockReader |  Major | . | Shengjun Xin | Xiao Chen |
| [HDFS-10267](https://issues.apache.org/jira/browse/HDFS-10267) | Extra "synchronized" on FsDatasetImpl#recoverAppend and FsDatasetImpl#recoverClose |  Major | datanode | Colin P. McCabe | Colin P. McCabe |
| [YARN-4740](https://issues.apache.org/jira/browse/YARN-4740) | AM may not receive the container complete msg when it restarts |  Major | . | sandflee | sandflee |
| [MAPREDUCE-6633](https://issues.apache.org/jira/browse/MAPREDUCE-6633) | AM should retry map attempts if the reduce task encounters commpression related errors. |  Major | . | Rushabh S Shah | Rushabh S Shah |
| [YARN-4938](https://issues.apache.org/jira/browse/YARN-4938) | MiniYarnCluster should not request transitionToActive to RM on non-HA environment |  Major | test | Akira Ajisaka | Eric Badger |
| [HADOOP-12406](https://issues.apache.org/jira/browse/HADOOP-12406) | AbstractMapWritable.readFields throws ClassNotFoundException with custom writables |  Blocker | io | Nadeem Douba | Nadeem Douba |
| [HADOOP-12993](https://issues.apache.org/jira/browse/HADOOP-12993) | Change ShutdownHookManger complete shutdown log from INFO to DEBUG |  Minor | . | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-10277](https://issues.apache.org/jira/browse/HDFS-10277) | PositionedReadable test testReadFullyZeroByteFile failing in HDFS |  Major | test | Steve Loughran | Steve Loughran |
| [HDFS-10271](https://issues.apache.org/jira/browse/HDFS-10271) | Extra bytes are getting released from reservedSpace for append |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-12964](https://issues.apache.org/jira/browse/HADOOP-12964) | Http server vulnerable to clickjacking |  Major | . | Haibo Chen | Haibo Chen |
| [YARN-4794](https://issues.apache.org/jira/browse/YARN-4794) | Deadlock in NMClientImpl |  Critical | . | Sumana Sathish | Jian He |
| [HDFS-9772](https://issues.apache.org/jira/browse/HDFS-9772) | TestBlockReplacement#testThrottler doesn't work as expected |  Minor | . | Yiqun Lin | Yiqun Lin |
| [HDFS-10270](https://issues.apache.org/jira/browse/HDFS-10270) | TestJMXGet:testNameNode() fails |  Minor | test | Andras Bokor | Gergely Novák |
| [HDFS-10216](https://issues.apache.org/jira/browse/HDFS-10216) | distcp -diff relative path exception |  Major | distcp | John Zhuge | Takashi Ohnishi |
| [YARN-4924](https://issues.apache.org/jira/browse/YARN-4924) | NM recovery race can lead to container not cleaned up |  Major | nodemanager | Nathan Roberts | sandflee |
| [HADOOP-12989](https://issues.apache.org/jira/browse/HADOOP-12989) | Some tests in org.apache.hadoop.fs.shell.find occasionally time out |  Major | test | Akira Ajisaka | Takashi Ohnishi |
| [HADOOP-13026](https://issues.apache.org/jira/browse/HADOOP-13026) | Should not wrap IOExceptions into a AuthenticationException in KerberosAuthenticator |  Critical | . | Xuan Gong | Xuan Gong |
| [YARN-4940](https://issues.apache.org/jira/browse/YARN-4940) | yarn node -list -all failed if RM start with decommissioned node |  Major | . | sandflee | sandflee |
| [YARN-4965](https://issues.apache.org/jira/browse/YARN-4965) | Distributed shell AM failed due to ClientHandlerException thrown by jersey |  Critical | . | Sumana Sathish | Junping Du |
| [YARN-4934](https://issues.apache.org/jira/browse/YARN-4934) | Reserved Resource for QueueMetrics needs to be handled correctly in few cases |  Major | capacity scheduler | Sunil G | Sunil G |
| [HDFS-10291](https://issues.apache.org/jira/browse/HDFS-10291) | TestShortCircuitLocalRead failing |  Major | test | Steve Loughran | Steve Loughran |
| [HDFS-10275](https://issues.apache.org/jira/browse/HDFS-10275) | TestDataNodeMetrics failing intermittently due to TotalWriteTime counted incorrectly |  Major | test | Yiqun Lin | Yiqun Lin |
| [MAPREDUCE-6649](https://issues.apache.org/jira/browse/MAPREDUCE-6649) | getFailureInfo not returning any failure info |  Major | . | Eric Badger | Eric Badger |
| [HDFS-10265](https://issues.apache.org/jira/browse/HDFS-10265) | OEV tool fails to read edit xml file if OP\_UPDATE\_BLOCKS has no BLOCK tag |  Minor | tools | Wan Chang | Wan Chang |
| [HDFS-9744](https://issues.apache.org/jira/browse/HDFS-9744) | TestDirectoryScanner#testThrottling occasionally time out after 300 seconds |  Minor | datanode | Wei-Chiu Chuang | Yiqun Lin |
| [HDFS-10308](https://issues.apache.org/jira/browse/HDFS-10308) | TestRetryCacheWithHA#testRetryCacheOnStandbyNN failing |  Major | test | Rakesh R | Rakesh R |
| [HDFS-10312](https://issues.apache.org/jira/browse/HDFS-10312) | Large block reports may fail to decode at NameNode due to 64 MB protobuf maximum length restriction. |  Major | namenode | Chris Nauroth | Chris Nauroth |
| [MAPREDUCE-6680](https://issues.apache.org/jira/browse/MAPREDUCE-6680) | JHS UserLogDir scan algorithm sometime could skip directory with update in CloudFS (Azure FileSystem, S3, etc.) |  Major | jobhistoryserver | Junping Du | Junping Du |
| [HDFS-9670](https://issues.apache.org/jira/browse/HDFS-9670) | DistCp throws NPE when source is root |  Major | distcp | Yongjun Zhang | John Zhuge |
| [HADOOP-13042](https://issues.apache.org/jira/browse/HADOOP-13042) | Restore lost leveldbjni LICENSE and NOTICE changes |  Major | . | Andrew Wang | Andrew Wang |
| [HADOOP-13043](https://issues.apache.org/jira/browse/HADOOP-13043) | Add LICENSE.txt entries for bundled javascript dependencies |  Major | . | Andrew Wang | Andrew Wang |
| [HDFS-10319](https://issues.apache.org/jira/browse/HDFS-10319) | Balancer should not try to pair storages with different types |  Minor | balancer & mover | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-10309](https://issues.apache.org/jira/browse/HDFS-10309) | Balancer doesn't honor dfs.blocksize value defined with suffix k(kilo), m(mega), g(giga) |  Minor | balancer & mover | Amit Anand | Amit Anand |
| [HDFS-9555](https://issues.apache.org/jira/browse/HDFS-9555) | LazyPersistFileScrubber should still sleep if there are errors in the clear progress |  Major | . | Phil Yang | Phil Yang |
| [HADOOP-13052](https://issues.apache.org/jira/browse/HADOOP-13052) | ChecksumFileSystem mishandles crc file permissions |  Major | fs | Daryn Sharp | Daryn Sharp |
| [HDFS-9905](https://issues.apache.org/jira/browse/HDFS-9905) | WebHdfsFileSystem#runWithRetry should display original stack trace on error |  Major | test | Kihwal Lee | Wei-Chiu Chuang |
| [HADOOP-11418](https://issues.apache.org/jira/browse/HADOOP-11418) | Property "io.compression.codec.lzo.class" does not work with other value besides default |  Major | io | fang fang chen | Yuanbo Liu |
| [HDFS-10318](https://issues.apache.org/jira/browse/HDFS-10318) | TestJMXGet hides the real error in case of test failure |  Minor | test | Andras Bokor | Andras Bokor |
| [YARN-4556](https://issues.apache.org/jira/browse/YARN-4556) |  TestFifoScheduler.testResourceOverCommit fails |  Major | scheduler, test | Akihiro Suda | Akihiro Suda |
| [HDFS-10329](https://issues.apache.org/jira/browse/HDFS-10329) | Bad initialisation of StringBuffer in RequestHedgingProxyProvider.java |  Minor | ha | Max Schaefer | Yiqun Lin |
| [HDFS-10313](https://issues.apache.org/jira/browse/HDFS-10313) | Distcp need to enforce the order of snapshot names passed to -diff |  Major | distcp | Yongjun Zhang | Yiqun Lin |
| [MAPREDUCE-6199](https://issues.apache.org/jira/browse/MAPREDUCE-6199) | AbstractCounters are not reset completely on deserialization |  Major | . | Anubhav Dhoot | Anubhav Dhoot |
| [HADOOP-13030](https://issues.apache.org/jira/browse/HADOOP-13030) | Handle special characters in passwords in KMS startup script |  Major | kms | Xiao Chen | Xiao Chen |
| [YARN-4955](https://issues.apache.org/jira/browse/YARN-4955) | Add retry for SocketTimeoutException in TimelineClient |  Critical | . | Xuan Gong | Xuan Gong |
| [HDFS-9958](https://issues.apache.org/jira/browse/HDFS-9958) | BlockManager#createLocatedBlocks can throw NPE for corruptBlocks on failed storages. |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [YARN-5008](https://issues.apache.org/jira/browse/YARN-5008) | LeveldbRMStateStore database can grow substantially leading to long recovery times |  Major | resourcemanager | Jason Lowe | Jason Lowe |
| [YARN-5009](https://issues.apache.org/jira/browse/YARN-5009) | NMLeveldbStateStoreService database can grow substantially leading to longer recovery times |  Major | nodemanager | Jason Lowe | Jason Lowe |
| [HADOOP-12378](https://issues.apache.org/jira/browse/HADOOP-12378) | Fix findbugs warnings in hadoop-tools module |  Major | tools | Akira Ajisaka | Akira Ajisaka |
| [HDFS-10260](https://issues.apache.org/jira/browse/HDFS-10260) | TestFsDatasetImpl#testCleanShutdownOfVolume often fails |  Major | datanode, test | Wei-Chiu Chuang | Rushabh S Shah |
| [HDFS-10335](https://issues.apache.org/jira/browse/HDFS-10335) | Mover$Processor#chooseTarget() always chooses the first matching target storage group |  Critical | balancer & mover | Mingliang Liu | Mingliang Liu |
| [MAPREDUCE-6672](https://issues.apache.org/jira/browse/MAPREDUCE-6672) | TestTeraSort fails on Windows |  Minor | test | Tibor Kiss | Tibor Kiss |
| [HDFS-10347](https://issues.apache.org/jira/browse/HDFS-10347) | Namenode report bad block method doesn't log the bad block or datanode. |  Minor | namenode | Rushabh S Shah | Rushabh S Shah |
| [HADOOP-13072](https://issues.apache.org/jira/browse/HADOOP-13072) | WindowsGetSpaceUsed constructor should be public |  Major | . | Vinayakumar B | Vinayakumar B |
| [MAPREDUCE-6537](https://issues.apache.org/jira/browse/MAPREDUCE-6537) | Include hadoop-pipes examples in the release tarball |  Blocker | pipes | Allen Wittenauer | Kai Sasaki |
| [HDFS-10353](https://issues.apache.org/jira/browse/HDFS-10353) | Fix hadoop-hdfs-native-client compilation on Windows |  Blocker | build | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10344](https://issues.apache.org/jira/browse/HDFS-10344) | DistributedFileSystem#getTrashRoots should skip encryption zone that does not have .Trash |  Major | . | Namit Maheshwari | Xiaoyu Yao |
| [HADOOP-13080](https://issues.apache.org/jira/browse/HADOOP-13080) | Refresh time in SysInfoWindows is in nanoseconds |  Major | util | Inigo Goiri | Inigo Goiri |
| [YARN-4834](https://issues.apache.org/jira/browse/YARN-4834) | ProcfsBasedProcessTree doesn't track daemonized processes |  Major | nodemanager | Nathan Roberts | Nathan Roberts |
| [HDFS-10320](https://issues.apache.org/jira/browse/HDFS-10320) | Rack failures may result in NN terminate |  Major | . | Xiao Chen | Xiao Chen |
| [MAPREDUCE-6675](https://issues.apache.org/jira/browse/MAPREDUCE-6675) | TestJobImpl.testUnusableNode failed |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [YARN-4311](https://issues.apache.org/jira/browse/YARN-4311) | Removing nodes from include and exclude lists will not remove them from decommissioned nodes list |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [YARN-4984](https://issues.apache.org/jira/browse/YARN-4984) | LogAggregationService shouldn't swallow exception in handling createAppDir() which cause thread leak. |  Critical | log-aggregation | Junping Du | Junping Du |
| [HADOOP-13098](https://issues.apache.org/jira/browse/HADOOP-13098) | Dynamic LogLevel setting page should accept case-insensitive log level string |  Major | . | Junping Du | Junping Du |
| [HDFS-10324](https://issues.apache.org/jira/browse/HDFS-10324) | Trash directory in an encryption zone should be pre-created with correct permissions |  Major | encryption | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [MAPREDUCE-6514](https://issues.apache.org/jira/browse/MAPREDUCE-6514) | Job hangs as ask is not updated after ramping down of all reducers |  Blocker | applicationmaster | Varun Saxena | Varun Saxena |
| [HDFS-2043](https://issues.apache.org/jira/browse/HDFS-2043) | TestHFlush failing intermittently |  Major | test | Aaron T. Myers | Yiqun Lin |
| [HADOOP-12751](https://issues.apache.org/jira/browse/HADOOP-12751) | While using kerberos Hadoop incorrectly assumes names with '@' to be non-simple |  Critical | security | Bolke de Bruin | Bolke de Bruin |
| [MAPREDUCE-6689](https://issues.apache.org/jira/browse/MAPREDUCE-6689) | MapReduce job can infinitely increase number of reducer resource requests |  Blocker | . | Wangda Tan | Wangda Tan |
| [YARN-4747](https://issues.apache.org/jira/browse/YARN-4747) | AHS error 500 due to NPE when container start event is missing |  Major | timelineserver | Jason Lowe | Varun Saxena |
| [HDFS-9939](https://issues.apache.org/jira/browse/HDFS-9939) | Increase DecompressorStream skip buffer size |  Major | . | Yongjun Zhang | John Zhuge |
| [YARN-5048](https://issues.apache.org/jira/browse/YARN-5048) | DelegationTokenRenewer#skipTokenRenewal may throw NPE |  Major | . | Jian He | Jian He |
| [YARN-4926](https://issues.apache.org/jira/browse/YARN-4926) | Change nodelabel rest API invalid reponse status to 400 |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-10372](https://issues.apache.org/jira/browse/HDFS-10372) | Fix for failing TestFsDatasetImpl#testCleanShutdownOfVolume |  Major | test | Rushabh S Shah | Rushabh S Shah |
| [MAPREDUCE-6684](https://issues.apache.org/jira/browse/MAPREDUCE-6684) | High contention on scanning of user directory under immediate\_done in Job History Server |  Critical | jobhistoryserver | Haibo Chen | Haibo Chen |
| [HDFS-6187](https://issues.apache.org/jira/browse/HDFS-6187) | Update the document of hftp/hsftp in branch-2 to mention that they are deprecated |  Major | . | Haohui Mai | Gergely Novák |
| [YARN-4768](https://issues.apache.org/jira/browse/YARN-4768) | getAvailablePhysicalMemorySize can be inaccurate on linux |  Major | nodemanager | Nathan Roberts | Nathan Roberts |
| [HADOOP-13125](https://issues.apache.org/jira/browse/HADOOP-13125) | FS Contract tests don't report FS initialization errors well |  Minor | test | Steve Loughran | Steve Loughran |
| [YARN-5029](https://issues.apache.org/jira/browse/YARN-5029) | RM needs to send update event with YarnApplicationState as Running to ATS/AHS |  Critical | . | Xuan Gong | Xuan Gong |
| [HADOOP-13116](https://issues.apache.org/jira/browse/HADOOP-13116) | Jets3tNativeS3FileSystemContractTest does not run. |  Minor | test | Chris Nauroth | Chris Nauroth |
| [MAPREDUCE-6639](https://issues.apache.org/jira/browse/MAPREDUCE-6639) | Process hangs in LocatedFileStatusFetcher if FileSystem.get throws |  Major | mrv2 | Ryan Blue | Ryan Blue |
| [HADOOP-11180](https://issues.apache.org/jira/browse/HADOOP-11180) | Change log message "token.Token: Cannot find class for token kind kms-dt" to debug |  Major | kms, security | Yi Liu | Yi Liu |
| [MAPREDUCE-6558](https://issues.apache.org/jira/browse/MAPREDUCE-6558) | multibyte delimiters with compressed input files generate duplicate records |  Major | mrv1, mrv2 | Wilfred Spiegelenburg | Wilfred Spiegelenburg |
| [HADOOP-13083](https://issues.apache.org/jira/browse/HADOOP-13083) | The number of javadocs warnings is limited to 100 |  Critical | . | Li Lu | Gergely Novák |
| [MAPREDUCE-6513](https://issues.apache.org/jira/browse/MAPREDUCE-6513) | MR job got hanged forever when one NM unstable for some time |  Critical | applicationmaster, resourcemanager | Bob.zhao | Varun Saxena |
| [HDFS-10333](https://issues.apache.org/jira/browse/HDFS-10333) | Intermittent org.apache.hadoop.hdfs.TestFileAppend failure in trunk |  Major | hdfs | Yongjun Zhang | Yiqun Lin |
| [HADOOP-12942](https://issues.apache.org/jira/browse/HADOOP-12942) | hadoop credential commands non-obviously use password of "none" |  Major | security | Mike Yoder | Mike Yoder |
| [YARN-4325](https://issues.apache.org/jira/browse/YARN-4325) | Nodemanager log handlers fail to send finished/failed events in some cases |  Critical | . | Junping Du | Junping Du |
| [HDFS-10242](https://issues.apache.org/jira/browse/HDFS-10242) | Cannot create space quota of zero |  Major | documentation, fs | Takashi Ohnishi | Takashi Ohnishi |
| [MAPREDUCE-6693](https://issues.apache.org/jira/browse/MAPREDUCE-6693) | ArrayIndexOutOfBoundsException occurs when the length of the job name is equal to mapreduce.jobhistory.jobname.limit |  Critical | . | Bibin A Chundatt | Ajith S |
| [HADOOP-13163](https://issues.apache.org/jira/browse/HADOOP-13163) | Reuse pre-computed filestatus in Distcp-CopyMapper |  Minor | tools/distcp | Rajesh Balamohan | Rajesh Balamohan |
| [HDFS-10303](https://issues.apache.org/jira/browse/HDFS-10303) | DataStreamer#ResponseProcessor calculates packet ack latency incorrectly. |  Major | hdfs-client | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [MAPREDUCE-6698](https://issues.apache.org/jira/browse/MAPREDUCE-6698) | Increase timeout on TestUnnecessaryBlockingOnHistoryFileInfo.testTwoThreadsQueryingDifferentJobOfSameUser |  Major | jobhistoryserver | Haibo Chen | Haibo Chen |
| [HADOOP-13159](https://issues.apache.org/jira/browse/HADOOP-13159) | Fix potential NPE in Metrics2 source for DecayRpcScheduler |  Major | ipc | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-10397](https://issues.apache.org/jira/browse/HDFS-10397) | Distcp should ignore -delete option if -diff option is provided instead of exiting |  Major | distcp | Mingliang Liu | Mingliang Liu |
| [HDFS-10381](https://issues.apache.org/jira/browse/HDFS-10381) | DataStreamer DataNode exclusion log message should be warning |  Minor | hdfs-client | John Zhuge | John Zhuge |
| [HDFS-9226](https://issues.apache.org/jira/browse/HDFS-9226) | MiniDFSCluster leaks dependency Mockito via DataNodeTestUtils |  Major | test | Josh Elser | Josh Elser |
| [HADOOP-13138](https://issues.apache.org/jira/browse/HADOOP-13138) | Unable to append to a SequenceFile with Compression.NONE. |  Critical | . | Gervais Mickaël | Vinayakumar B |
| [YARN-4925](https://issues.apache.org/jira/browse/YARN-4925) | ContainerRequest in AMRMClient, application should be able to specify nodes/racks together with nodeLabelExpression |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [HADOOP-13157](https://issues.apache.org/jira/browse/HADOOP-13157) | Follow-on improvements to hadoop credential commands |  Major | security | Mike Yoder | Mike Yoder |
| [YARN-3840](https://issues.apache.org/jira/browse/YARN-3840) | Resource Manager web ui issue when sorting application by id (with application having id \> 9999) |  Major | resourcemanager | LINTE | Varun Saxena |
| [HADOOP-13177](https://issues.apache.org/jira/browse/HADOOP-13177) | Native tests fail on OS X, because DYLD\_LIBRARY\_PATH is not defined to include libhadoop.dylib. |  Minor | build | Chris Nauroth | Chris Nauroth |
| [HADOOP-12767](https://issues.apache.org/jira/browse/HADOOP-12767) | update apache httpclient version to 4.5.2; httpcore to 4.4.4 |  Major | build | Artem Aliev | Artem Aliev |
| [YARN-5100](https://issues.apache.org/jira/browse/YARN-5100) | The YarnApplicationState is always running in ATS no matter the application is running or finishes. |  Blocker | . | Xuan Gong | Xuan Gong |
| [HADOOP-13183](https://issues.apache.org/jira/browse/HADOOP-13183) | S3A proxy tests fail after httpclient/httpcore upgrade. |  Major | fs/s3 | Chris Nauroth | Steve Loughran |
| [YARN-5020](https://issues.apache.org/jira/browse/YARN-5020) | Fix Documentation for Yarn Capacity Scheduler on Resource Calculator |  Minor | . | Jo Desmet | Takashi Ohnishi |
| [HDFS-10424](https://issues.apache.org/jira/browse/HDFS-10424) | DatanodeLifelineProtocol not able to use under security cluster |  Blocker | . | gu-chi | Chris Nauroth |
| [HDFS-10438](https://issues.apache.org/jira/browse/HDFS-10438) | When NameNode HA is configured to use the lifeline RPC server, it should log the address of that server. |  Minor | ha, namenode | KWON BYUNGCHANG | Chris Nauroth |
| [HDFS-10439](https://issues.apache.org/jira/browse/HDFS-10439) | Update setOwner doc in HdfsPermissionsGuide |  Minor | documentation | John Zhuge | John Zhuge |
| [MAPREDUCE-6607](https://issues.apache.org/jira/browse/MAPREDUCE-6607) | Enable regex pattern matching when mapreduce.task.files.preserve.filepattern is set |  Minor | applicationmaster | Maysam Yabandeh | Kai Sasaki |
| [YARN-5103](https://issues.apache.org/jira/browse/YARN-5103) | With NM recovery enabled, restarting NM multiple times results in AM restart |  Critical | yarn | Sumana Sathish | Junping Du |
| [YARN-5055](https://issues.apache.org/jira/browse/YARN-5055) | max apps per user can be larger than max per queue |  Minor | capacityscheduler, resourcemanager | Jason Lowe | Eric Badger |
| [YARN-3971](https://issues.apache.org/jira/browse/YARN-3971) | Skip RMNodeLabelsManager#checkRemoveFromClusterNodeLabelsOfQueue on nodelabel recovery |  Critical | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-9365](https://issues.apache.org/jira/browse/HDFS-9365) | Balancer does not work with the HDFS-6376 HA setup |  Major | balancer & mover | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [YARN-3344](https://issues.apache.org/jira/browse/YARN-3344) | Fix warning - procfs stat file is not in the expected format |  Major | . | Jon Bringhurst | Ravindra Kumar Naik |
| [YARN-4459](https://issues.apache.org/jira/browse/YARN-4459) | container-executor should only kill process groups |  Major | nodemanager | Jun Gong | Jun Gong |
| [YARN-5166](https://issues.apache.org/jira/browse/YARN-5166) | javadoc:javadoc goal fails on hadoop-yarn-client |  Major | . | Andras Bokor | Andras Bokor |
| [HDFS-10276](https://issues.apache.org/jira/browse/HDFS-10276) | HDFS should not expose path info that user has no permission to see. |  Major | . | Kevin Cox | Yuanbo Liu |
| [YARN-5132](https://issues.apache.org/jira/browse/YARN-5132) | Exclude generated protobuf sources from YARN Javadoc build |  Critical | . | Subru Krishnan | Subru Krishnan |
| [HADOOP-13132](https://issues.apache.org/jira/browse/HADOOP-13132) | Handle ClassCastException on AuthenticationException in LoadBalancingKMSClientProvider |  Major | kms | Miklos Szurap | Wei-Chiu Chuang |
| [HDFS-10415](https://issues.apache.org/jira/browse/HDFS-10415) | TestDistributedFileSystem#MyDistributedFileSystem attempts to set up statistics before initialize() is called |  Major | test | Sangjin Lee | Mingliang Liu |
| [HADOOP-13137](https://issues.apache.org/jira/browse/HADOOP-13137) | TraceAdmin should support Kerberized cluster |  Major | tracing | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9476](https://issues.apache.org/jira/browse/HDFS-9476) | TestDFSUpgradeFromImage#testUpgradeFromRel1BBWImage occasionally fail |  Major | . | Wei-Chiu Chuang | Masatake Iwasaki |
| [HDFS-10367](https://issues.apache.org/jira/browse/HDFS-10367) | TestDFSShell.testMoveWithTargetPortEmpty fails with Address bind exception. |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10471](https://issues.apache.org/jira/browse/HDFS-10471) | DFSAdmin#SetQuotaCommand's help msg is not correct |  Minor | documentation | Yiqun Lin | Yiqun Lin |
| [YARN-5098](https://issues.apache.org/jira/browse/YARN-5098) | Yarn Application log Aggreagation fails due to NM can not get correct HDFS delegation token |  Major | yarn | Yesha Vora | Jian He |
| [HADOOP-13155](https://issues.apache.org/jira/browse/HADOOP-13155) | Implement TokenRenewer to renew and cancel delegation tokens in KMS |  Major | kms, security | Xiao Chen | Xiao Chen |
| [HDFS-10481](https://issues.apache.org/jira/browse/HDFS-10481) | HTTPFS server should correctly impersonate as end user to open file |  Major | httpfs | Xiao Chen | Xiao Chen |
| [HDFS-10485](https://issues.apache.org/jira/browse/HDFS-10485) | Fix findbugs warning in FSEditLog.java |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-10458](https://issues.apache.org/jira/browse/HDFS-10458) | getFileEncryptionInfo should return quickly for non-encrypted cluster |  Major | encryption, namenode | Zhe Zhang | Zhe Zhang |
| [YARN-5206](https://issues.apache.org/jira/browse/YARN-5206) | RegistrySecurity includes id:pass in exception text if considered invalid |  Minor | client, security | Steve Loughran | Steve Loughran |
| [HDFS-10220](https://issues.apache.org/jira/browse/HDFS-10220) | A large number of expired leases can make namenode unresponsive and cause failover |  Major | namenode | Nicolas Fraison | Nicolas Fraison |
| [HADOOP-13249](https://issues.apache.org/jira/browse/HADOOP-13249) | RetryInvocationHandler need wrap InterruptedException in IOException when call Thread.sleep |  Major | ipc | zhihai xu | zhihai xu |
| [HADOOP-13213](https://issues.apache.org/jira/browse/HADOOP-13213) | Small Documentation bug with AuthenticatedURL in hadoop-auth |  Minor | documentation | Tom Ellis | Tom Ellis |
| [HADOOP-13079](https://issues.apache.org/jira/browse/HADOOP-13079) | Add -q option to Ls to print ? instead of non-printable characters |  Major | . | John Zhuge | John Zhuge |
| [HDFS-10516](https://issues.apache.org/jira/browse/HDFS-10516) | Fix bug when warming up EDEK cache of more than one encryption zone |  Major | encryption, namenode | Xiao Chen | Xiao Chen |
| [HADOOP-13270](https://issues.apache.org/jira/browse/HADOOP-13270) | BZip2CompressionInputStream finds the same compression marker twice in corner case, causing duplicate data blocks |  Critical | . | Haibo Chen | Kai Sasaki |
| [HADOOP-13179](https://issues.apache.org/jira/browse/HADOOP-13179) | GenericOptionsParser is not thread-safe because commons-cli OptionBuilder is not thread-safe |  Minor | . | hongbin ma | hongbin ma |
| [HADOOP-13244](https://issues.apache.org/jira/browse/HADOOP-13244) | o.a.h.ipc.Server#Server should honor handlerCount when queueSizePerHandler is specified in consturctor |  Minor | ipc | Xiaoyu Yao | Kai Sasaki |
| [HADOOP-13245](https://issues.apache.org/jira/browse/HADOOP-13245) | Fix up some misc create-release issues |  Blocker | build | Allen Wittenauer | Allen Wittenauer |
| [HDFS-10505](https://issues.apache.org/jira/browse/HDFS-10505) | OIV's ReverseXML processor should support ACLs |  Major | tools | Colin P. McCabe | Surendra Singh Lilhore |
| [HDFS-10525](https://issues.apache.org/jira/browse/HDFS-10525) | Fix NPE in CacheReplicationMonitor#rescanCachedBlockMap |  Major | caching | Xiao Chen | Xiao Chen |
| [YARN-5237](https://issues.apache.org/jira/browse/YARN-5237) | Fix missing log files issue in rolling log aggregation. |  Major | . | Siddharth Seth | Xuan Gong |
| [HDFS-10532](https://issues.apache.org/jira/browse/HDFS-10532) | Typo in RollingUpgrade docs |  Major | documentation | Arpit Agarwal | Yiqun Lin |
| [HADOOP-3733](https://issues.apache.org/jira/browse/HADOOP-3733) | "s3:" URLs break when Secret Key contains a slash, even if encoded |  Minor | fs/s3 | Stuart Sierra | Steve Loughran |
| [HDFS-9466](https://issues.apache.org/jira/browse/HDFS-9466) | TestShortCircuitCache#testDataXceiverCleansUpSlotsOnFailure is flaky |  Major | fs, hdfs-client | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-13255](https://issues.apache.org/jira/browse/HADOOP-13255) | KMSClientProvider should check and renew tgt when doing delegation token operations. |  Major | kms | Xiao Chen | Xiao Chen |
| [HADOOP-13285](https://issues.apache.org/jira/browse/HADOOP-13285) | DecayRpcScheduler MXBean should only report decayed CallVolumeSummary |  Major | ipc | Namit Maheshwari | Xiaoyu Yao |
| [HADOOP-13149](https://issues.apache.org/jira/browse/HADOOP-13149) | Windows distro build fails on dist-copynativelibs. |  Blocker | build | Chris Nauroth | Chris Nauroth |
| [YARN-5246](https://issues.apache.org/jira/browse/YARN-5246) | NMWebAppFilter web redirects drop query parameters |  Major | . | Varun Vasudev | Varun Vasudev |
| [HDFS-10474](https://issues.apache.org/jira/browse/HDFS-10474) | hftp copy fails when file name with Chinese+special char in branch-2 |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13192](https://issues.apache.org/jira/browse/HADOOP-13192) | org.apache.hadoop.util.LineReader cannot handle multibyte delimiters correctly |  Critical | util | binde | binde |
| [HDFS-10448](https://issues.apache.org/jira/browse/HDFS-10448) | CacheManager#addInternal tracks bytesNeeded incorrectly when dealing with replication factors other than 1 |  Major | caching | Yiqun Lin | Yiqun Lin |
| [YARN-5197](https://issues.apache.org/jira/browse/YARN-5197) | RM leaks containers if running container disappears from node update |  Major | resourcemanager | Jason Lowe | Jason Lowe |
| [HADOOP-13287](https://issues.apache.org/jira/browse/HADOOP-13287) | TestS3ACredentials#testInstantiateFromURL fails if AWS secret key contains '+'. |  Minor | fs/s3, test | Chris Nauroth | Chris Nauroth |
| [HDFS-10556](https://issues.apache.org/jira/browse/HDFS-10556) | DistCpOptions should be validated automatically |  Major | distcp | Mingliang Liu | Mingliang Liu |
| [MAPREDUCE-6725](https://issues.apache.org/jira/browse/MAPREDUCE-6725) | Javadoc for CLI#listEvents() contains no-existent param |  Minor | client, documentation | Shen Yinjie | Shen Yinjie |
| [HDFS-7959](https://issues.apache.org/jira/browse/HDFS-7959) | WebHdfs logging is missing on Datanode |  Critical | . | Kihwal Lee | Kihwal Lee |
| [MAPREDUCE-6542](https://issues.apache.org/jira/browse/MAPREDUCE-6542) | HistoryViewer uses SimpleDateFormat, but SimpleDateFormat is not threadsafe |  Major | jobhistoryserver | zhangyubiao | zhangyubiao |
| [HADOOP-13251](https://issues.apache.org/jira/browse/HADOOP-13251) | Authenticate with Kerberos credentials when renewing KMS delegation token |  Major | kms | Xiao Chen | Xiao Chen |
| [HADOOP-13316](https://issues.apache.org/jira/browse/HADOOP-13316) | Enforce Kerberos authentication for required ops in DelegationTokenAuthenticator |  Blocker | kms, security | Xiao Chen | Xiao Chen |
| [HDFS-9852](https://issues.apache.org/jira/browse/HDFS-9852) | hdfs dfs -setfacl error message is misleading |  Minor | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-5262](https://issues.apache.org/jira/browse/YARN-5262) | Optimize sending RMNodeFinishedContainersPulledByAMEvent for every AM heartbeat |  Major | resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [HADOOP-12345](https://issues.apache.org/jira/browse/HADOOP-12345) | Pad hostname correctly in CredentialsSys.java |  Critical | nfs | Pradeep Nayak Udupi Kadbet | Pradeep Nayak Udupi Kadbet |
| [HADOOP-13314](https://issues.apache.org/jira/browse/HADOOP-13314) | Remove 'package-info.java' from 'test\java\org\apache\hadoop\fs\shell\' to remove eclipse compile error |  Trivial | . | Vinayakumar B | Vinayakumar B |
| [HDFS-10589](https://issues.apache.org/jira/browse/HDFS-10589) | Javadoc for HAState#HAState and HAState#setStateInternal contains non-existent params |  Minor | documentation, hdfs | Shen Yinjie | Shen Yinjie |
| [YARN-5286](https://issues.apache.org/jira/browse/YARN-5286) | Add RPC port info in RM web service's response when getting app status |  Major | . | Jun Gong | Jun Gong |
| [YARN-5214](https://issues.apache.org/jira/browse/YARN-5214) | Pending on synchronized method DirectoryCollection#checkDirs can hang NM's NodeStatusUpdater |  Critical | nodemanager | Junping Du | Junping Du |
| [HADOOP-13350](https://issues.apache.org/jira/browse/HADOOP-13350) | Additional fix to LICENSE and NOTICE |  Blocker | build | Xiao Chen | Xiao Chen |
| [HDFS-10592](https://issues.apache.org/jira/browse/HDFS-10592) | Fix intermittent test failure of TestNameNodeResourceChecker#testCheckThatNameNodeResourceMonitorIsRunning |  Major | test | Rakesh R | Rakesh R |
| [HADOOP-13320](https://issues.apache.org/jira/browse/HADOOP-13320) | Fix arguments check in documentation for WordCount v2.0 |  Minor | documentation | niccolo becchi | niccolo becchi |
| [YARN-5314](https://issues.apache.org/jira/browse/YARN-5314) | ConcurrentModificationException in ATS v1.5 EntityGroupFSTimelineStore |  Major | timelineserver | Karam Singh | Li Lu |
| [YARN-4939](https://issues.apache.org/jira/browse/YARN-4939) | the decommissioning Node should keep alive  if NM restart |  Major | . | sandflee | sandflee |
| [HADOOP-12893](https://issues.apache.org/jira/browse/HADOOP-12893) | Verify LICENSE.txt and NOTICE.txt |  Blocker | build | Allen Wittenauer | Xiao Chen |
| [HADOOP-13352](https://issues.apache.org/jira/browse/HADOOP-13352) | Make X-FRAME-OPTIONS configurable in HttpServer2 |  Major | net, security | Anu Engineer | Anu Engineer |
| [HDFS-10336](https://issues.apache.org/jira/browse/HDFS-10336) | TestBalancer failing intermittently because of not reseting UserGroupInformation completely |  Major | test | Yiqun Lin | Yiqun Lin |
| [HDFS-10512](https://issues.apache.org/jira/browse/HDFS-10512) | VolumeScanner may terminate due to NPE in DataNode.reportBadBlocks |  Major | datanode | Wei-Chiu Chuang | Yiqun Lin |
| [YARN-5337](https://issues.apache.org/jira/browse/YARN-5337) | Fix OOM issue in DistributedShell. AM failed with "java.lang.OutOfMemoryError: GC overhead limit exceeded" |  Major | . | Sumana Sathish | Jian He |
| [HADOOP-13297](https://issues.apache.org/jira/browse/HADOOP-13297) | Add missing dependency in setting maven-remote-resource-plugin to fix builds |  Major | build | Akira Ajisaka | Sean Busbey |
| [YARN-5270](https://issues.apache.org/jira/browse/YARN-5270) | Solve miscellaneous issues caused by YARN-4844 |  Blocker | . | Wangda Tan | Wangda Tan |
| [HDFS-10579](https://issues.apache.org/jira/browse/HDFS-10579) | HDFS web interfaces lack configs for X-FRAME-OPTIONS protection |  Major | datanode, namenode | Anu Engineer | Anu Engineer |
| [MAPREDUCE-6625](https://issues.apache.org/jira/browse/MAPREDUCE-6625) | TestCLI#testGetJob fails occasionally |  Major | test | Jason Lowe | Haibo Chen |
| [HADOOP-13315](https://issues.apache.org/jira/browse/HADOOP-13315) | FileContext#umask is not initialized properly |  Minor | . | John Zhuge | John Zhuge |
| [YARN-5353](https://issues.apache.org/jira/browse/YARN-5353) | ResourceManager can leak delegation tokens when they are shared across apps |  Critical | resourcemanager | Jason Lowe | Jason Lowe |
| [HADOOP-11361](https://issues.apache.org/jira/browse/HADOOP-11361) | Fix a race condition in MetricsSourceAdapter.updateJmxCache |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10544](https://issues.apache.org/jira/browse/HDFS-10544) | Balancer doesn't work with IPFailoverProxyProvider |  Major | balancer & mover, ha | Zhe Zhang | Zhe Zhang |
| [HADOOP-13351](https://issues.apache.org/jira/browse/HADOOP-13351) | TestDFSClientSocketSize buffer size tests are flaky |  Major | . | Aaron Fabbri | Aaron Fabbri |
| [HADOOP-13202](https://issues.apache.org/jira/browse/HADOOP-13202) | Avoid possible overflow in org.apache.hadoop.util.bloom.BloomFilter#getNBytes |  Major | util | zhengbing li | Kai Sasaki |
| [HDFS-10603](https://issues.apache.org/jira/browse/HDFS-10603) | Fix flaky tests in org.apache.hadoop.hdfs.server.namenode.snapshot.TestOpenFilesWithSnapshot |  Major | hdfs, namenode | Yongjun Zhang | Yiqun Lin |
| [HADOOP-12991](https://issues.apache.org/jira/browse/HADOOP-12991) | Conflicting default ports in DelegateToFileSystem |  Major | fs | Kevin Hogeland | Kai Sasaki |
| [YARN-5309](https://issues.apache.org/jira/browse/YARN-5309) | Fix SSLFactory truststore reloader thread leak in TimelineClientImpl |  Blocker | timelineserver, yarn | Thomas Friedrich | Weiwei Yang |
| [HADOOP-13387](https://issues.apache.org/jira/browse/HADOOP-13387) | users always get told off for using S3 —even when not using it. |  Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-5340](https://issues.apache.org/jira/browse/YARN-5340) | Race condition in RollingLevelDBTimelineStore#getAndSetStartTime() |  Critical | timelineserver | Sumana Sathish | Li Lu |
| [HDFS-8914](https://issues.apache.org/jira/browse/HDFS-8914) | Document HA support in the HDFS HdfsDesign.md |  Major | documentation | Ravindra Babu | Lars Francke |
| [HADOOP-12588](https://issues.apache.org/jira/browse/HADOOP-12588) | Fix intermittent test failure of TestGangliaMetrics |  Major | . | Tsuyoshi Ozawa | Masatake Iwasaki |
| [HADOOP-13240](https://issues.apache.org/jira/browse/HADOOP-13240) | TestAclCommands.testSetfaclValidations fail |  Minor | test | linbao111 | John Zhuge |
| [HADOOP-13389](https://issues.apache.org/jira/browse/HADOOP-13389) | TestS3ATemporaryCredentials.testSTS error when using IAM credentials |  Major | fs/s3 | Steven K. Wong | Steven K. Wong |
| [HADOOP-13406](https://issues.apache.org/jira/browse/HADOOP-13406) | S3AFileSystem: Consider reusing filestatus in delete() and mkdirs() |  Minor | fs/s3 | Rajesh Balamohan | Rajesh Balamohan |
| [MAPREDUCE-6744](https://issues.apache.org/jira/browse/MAPREDUCE-6744) | Increase timeout on TestDFSIO tests |  Major | . | Eric Badger | Eric Badger |
| [HDFS-10688](https://issues.apache.org/jira/browse/HDFS-10688) | BPServiceActor may run into a tight loop for sending block report when hitting IOException |  Major | datanode | Jing Zhao | Chen Liang |
| [HDFS-10671](https://issues.apache.org/jira/browse/HDFS-10671) | Fix typo in HdfsRollingUpgrade.md |  Trivial | documentation | Yiqun Lin | Yiqun Lin |
| [HADOOP-13422](https://issues.apache.org/jira/browse/HADOOP-13422) | ZKDelegationTokenSecretManager JaasConfig does not work well with other ZK users in process |  Major | . | Sergey Shelukhin | Sergey Shelukhin |
| [HDFS-10696](https://issues.apache.org/jira/browse/HDFS-10696) | TestHDFSCLI fails |  Major | test | Akira Ajisaka | Kai Sasaki |
| [YARN-5432](https://issues.apache.org/jira/browse/YARN-5432) | Lock already held by another process while LevelDB cache store creation for dag |  Critical | timelineserver | Karam Singh | Li Lu |
| [YARN-5438](https://issues.apache.org/jira/browse/YARN-5438) | TimelineClientImpl leaking FileSystem Instances causing Long running services like HiverServer2 daemon going OOM |  Major | timelineserver | Karam Singh | Rohith Sharma K S |
| [HADOOP-13381](https://issues.apache.org/jira/browse/HADOOP-13381) | KMS clients should use KMS Delegation Tokens from current UGI. |  Critical | kms | Xiao Chen | Xiao Chen |
| [HDFS-10691](https://issues.apache.org/jira/browse/HDFS-10691) | FileDistribution fails in hdfs oiv command due to ArrayIndexOutOfBoundsException |  Major | . | Yiqun Lin | Yiqun Lin |
| [YARN-5121](https://issues.apache.org/jira/browse/YARN-5121) | fix some container-executor portability issues |  Blocker | nodemanager, security | Allen Wittenauer | Allen Wittenauer |
| [MAPREDUCE-6724](https://issues.apache.org/jira/browse/MAPREDUCE-6724) | Single shuffle to memory must not exceed Integer#MAX\_VALUE |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [HDFS-5805](https://issues.apache.org/jira/browse/HDFS-5805) | TestCheckpoint.testCheckpoint fails intermittently on branch2 |  Major | . | Mit Desai | Eric Badger |
| [HADOOP-13459](https://issues.apache.org/jira/browse/HADOOP-13459) | hadoop-azure runs several test cases repeatedly, causing unnecessarily long running time. |  Minor | fs/azure, test | Chris Nauroth | Chris Nauroth |
| [HDFS-742](https://issues.apache.org/jira/browse/HDFS-742) | A down DataNode makes Balancer to hang on repeatingly asking NameNode its partial block list |  Minor | balancer & mover | Hairong Kuang | Mit Desai |
| [YARN-4280](https://issues.apache.org/jira/browse/YARN-4280) | CapacityScheduler reservations may not prevent indefinite postponement on a busy cluster |  Major | capacity scheduler | Kuhu Shukla | Kuhu Shukla |
| [YARN-5462](https://issues.apache.org/jira/browse/YARN-5462) | TestNodeStatusUpdater.testNodeStatusUpdaterRetryAndNMShutdown fails intermittently |  Major | . | Eric Badger | Eric Badger |
| [HDFS-10710](https://issues.apache.org/jira/browse/HDFS-10710) | In BlockManager#rescanPostponedMisreplicatedBlocks(), postponed misreplicated block counts should be retrieved with NN lock protection |  Major | namenode | Rui Gao | Rui Gao |
| [YARN-5469](https://issues.apache.org/jira/browse/YARN-5469) | Increase timeout of TestAmFilter.testFilter |  Minor | . | Eric Badger | Eric Badger |
| [HDFS-10569](https://issues.apache.org/jira/browse/HDFS-10569) | A bug causes OutOfIndex error in BlockListAsLongs |  Minor | . | Weiwei Yang | Weiwei Yang |
| [HADOOP-13434](https://issues.apache.org/jira/browse/HADOOP-13434) | Add quoting to Shell class |  Major | . | Owen O'Malley | Owen O'Malley |
| [MAPREDUCE-6682](https://issues.apache.org/jira/browse/MAPREDUCE-6682) | TestMRCJCFileOutputCommitter fails intermittently |  Major | test | Brahma Reddy Battula | Akira Ajisaka |
| [HDFS-10716](https://issues.apache.org/jira/browse/HDFS-10716) | In Balancer, the target task should be removed when its size \< 0. |  Minor | balancer & mover | Yiqun Lin | Yiqun Lin |
| [HDFS-10722](https://issues.apache.org/jira/browse/HDFS-10722) | Fix race condition in TestEditLog#testBatchedSyncWithClosedLogs |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13467](https://issues.apache.org/jira/browse/HADOOP-13467) | Shell#getSignalKillCommand should use the bash builtin on Linux |  Major | . | Arpit Agarwal | Arpit Agarwal |
| [HDFS-10717](https://issues.apache.org/jira/browse/HDFS-10717) | Fix findbugs warnings of hadoop-hdfs-client in branch-2 |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-10343](https://issues.apache.org/jira/browse/HDFS-10343) | BlockManager#createLocatedBlocks may return blocks on failed storages |  Major | hdfs | Daryn Sharp | Kuhu Shukla |
| [HDFS-10715](https://issues.apache.org/jira/browse/HDFS-10715) | NPE when applying AvailableSpaceBlockPlacementPolicy |  Major | namenode | Guangbin Zhu | Guangbin Zhu |
| [YARN-4624](https://issues.apache.org/jira/browse/YARN-4624) | NPE in PartitionQueueCapacitiesInfo while accessing Schduler UI |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-10823](https://issues.apache.org/jira/browse/HADOOP-10823) | TestReloadingX509TrustManager is flaky |  Major | . | Ratandeep Ratti | Mingliang Liu |
| [HADOOP-13457](https://issues.apache.org/jira/browse/HADOOP-13457) | Remove hardcoded absolute path for shell executable |  Major | util | Arpit Agarwal | Chen Liang |
| [HADOOP-13439](https://issues.apache.org/jira/browse/HADOOP-13439) | Fix race between TestMetricsSystemImpl and TestGangliaMetrics |  Minor | test | Masatake Iwasaki | Chen Liang |
| [MAPREDUCE-6750](https://issues.apache.org/jira/browse/MAPREDUCE-6750) | TestHSAdminServer.testRefreshSuperUserGroups is failing |  Minor | test | Kihwal Lee | Kihwal Lee |
| [HADOOP-13473](https://issues.apache.org/jira/browse/HADOOP-13473) | Tracing in IPC Server is broken |  Major | . | Wei-Chiu Chuang | Daryn Sharp |
| [HDFS-10738](https://issues.apache.org/jira/browse/HDFS-10738) | Fix TestRefreshUserMappings.testRefreshSuperUserGroupsConfiguration test failure |  Major | test | Rakesh R | Rakesh R |
| [HADOOP-13299](https://issues.apache.org/jira/browse/HADOOP-13299) | JMXJsonServlet is vulnerable to TRACE |  Minor | . | Haibo Chen | Haibo Chen |
| [HDFS-8224](https://issues.apache.org/jira/browse/HDFS-8224) | Schedule a block for scanning if its metadata file is corrupt |  Major | datanode | Rushabh S Shah | Rushabh S Shah |
| [YARN-5382](https://issues.apache.org/jira/browse/YARN-5382) | RM does not audit log kill request for active applications |  Major | resourcemanager | Jason Lowe | Vrushali C |
| [HDFS-10643](https://issues.apache.org/jira/browse/HDFS-10643) | Namenode should use loginUser(hdfs) to generateEncryptedKey |  Major | encryption, namenode | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-8897](https://issues.apache.org/jira/browse/HDFS-8897) | Balancer should handle fs.defaultFS trailing slash in HA |  Major | balancer & mover | LINTE | John Zhuge |
| [HDFS-10731](https://issues.apache.org/jira/browse/HDFS-10731) | FSDirectory#verifyMaxDirItems does not log path name |  Minor | namenode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-5476](https://issues.apache.org/jira/browse/YARN-5476) | Not existed application reported as ACCEPTED state by YarnClientImpl |  Critical | yarn | Yesha Vora | Junping Du |
| [YARN-5491](https://issues.apache.org/jira/browse/YARN-5491) | Random Failure TestCapacityScheduler#testCSQueueBlocked |  Major | test | Bibin A Chundatt | Bibin A Chundatt |
| [HADOOP-13333](https://issues.apache.org/jira/browse/HADOOP-13333) | testConf.xml ls comparators in wrong order |  Trivial | fs | John Zhuge | Vrushali C |
| [HADOOP-13470](https://issues.apache.org/jira/browse/HADOOP-13470) | GenericTestUtils$LogCapturer is flaky |  Major | test, util | Mingliang Liu | Mingliang Liu |
| [HADOOP-13494](https://issues.apache.org/jira/browse/HADOOP-13494) | ReconfigurableBase can log sensitive information |  Major | security | Sean Mackrory | Sean Mackrory |
| [HDFS-9530](https://issues.apache.org/jira/browse/HDFS-9530) | ReservedSpace is not cleared for abandoned Blocks |  Critical | datanode | Fei Hui | Brahma Reddy Battula |
| [HDFS-10549](https://issues.apache.org/jira/browse/HDFS-10549) | Correctly revoke file leases when closing files |  Major | hdfs-client | Yiqun Lin | Yiqun Lin |
| [HADOOP-13513](https://issues.apache.org/jira/browse/HADOOP-13513) | Java 1.7 support for org.apache.hadoop.fs.azure testcases |  Minor | fs/azure | Tibor Kiss | Tibor Kiss |
| [HADOOP-13512](https://issues.apache.org/jira/browse/HADOOP-13512) | ReloadingX509TrustManager should keep reloading in case of exception |  Critical | security | Mingliang Liu | Mingliang Liu |
| [YARN-4307](https://issues.apache.org/jira/browse/YARN-4307) | Display blacklisted nodes for AM container in the RM web UI |  Major | resourcemanager, webapp | Naganarasimha G R | Naganarasimha G R |
| [MAPREDUCE-6763](https://issues.apache.org/jira/browse/MAPREDUCE-6763) | Shuffle server listen queue is too small |  Major | mrv2 | Jason Lowe | Jason Lowe |
| [YARN-4837](https://issues.apache.org/jira/browse/YARN-4837) | User facing aspects of 'AM blacklisting' feature need fixing |  Critical | . | Vinod Kumar Vavilapalli | Vinod Kumar Vavilapalli |
| [MAPREDUCE-6310](https://issues.apache.org/jira/browse/MAPREDUCE-6310) | Add jdiff support to MapReduce |  Blocker | . | Li Lu | Li Lu |
| [YARN-3388](https://issues.apache.org/jira/browse/YARN-3388) | Allocation in LeafQueue could get stuck because DRF calculator isn't well supported when computing user-limit |  Major | capacityscheduler | Nathan Roberts | Nathan Roberts |
| [YARN-4685](https://issues.apache.org/jira/browse/YARN-4685) | Disable AM blacklisting by default to mitigate situations that application get hanged |  Critical | resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [HADOOP-13428](https://issues.apache.org/jira/browse/HADOOP-13428) | Fix hadoop-common to generate jdiff |  Blocker | . | Wangda Tan | Wangda Tan |
| [HDFS-10764](https://issues.apache.org/jira/browse/HDFS-10764) | Fix INodeFile#getBlocks to not return null |  Major | namenode | Arpit Agarwal | Arpit Agarwal |
| [HDFS-10692](https://issues.apache.org/jira/browse/HDFS-10692) | Point JDiff base version for HDFS from 2.6.0 to 2.7.2 |  Blocker | . | Wangda Tan | Wangda Tan |
| [HADOOP-13487](https://issues.apache.org/jira/browse/HADOOP-13487) | Hadoop KMS should load old delegation tokens from Zookeeper on startup |  Major | kms | Alex Ivanov | Xiao Chen |
| [HDFS-10783](https://issues.apache.org/jira/browse/HDFS-10783) | The option '-maxSize' and '-step' fail in OfflineImageViewer |  Major | tools | Yiqun Lin | Yiqun Lin |
| [HADOOP-13524](https://issues.apache.org/jira/browse/HADOOP-13524) | mvn eclipse:eclipse generates .gitignore'able files |  Major | . | Vinod Kumar Vavilapalli | Vinod Kumar Vavilapalli |
| [HADOOP-13497](https://issues.apache.org/jira/browse/HADOOP-13497) | fix wrong command in CredentialProviderAPI.md |  Trivial | documentation | Yuanbo Liu | Yuanbo Liu |
| [MAPREDUCE-6761](https://issues.apache.org/jira/browse/MAPREDUCE-6761) | Regression when handling providers - invalid configuration ServiceConfiguration causes Cluster initialization failure |  Major | mrv2 | Peter Vary | Peter Vary |
| [HDFS-10748](https://issues.apache.org/jira/browse/HDFS-10748) | TestFileTruncate#testTruncateWithDataNodesRestart runs sometimes timeout |  Major | test | Xiaoyu Yao | Yiqun Lin |
| [HDFS-10793](https://issues.apache.org/jira/browse/HDFS-10793) | Fix HdfsAuditLogger binary incompatibility introduced by HDFS-9184 |  Blocker | . | Andrew Wang | Manoj Govindassamy |
| [HDFS-10652](https://issues.apache.org/jira/browse/HDFS-10652) | Add a unit test for HDFS-4660 |  Major | datanode, hdfs | Yongjun Zhang | Vinayakumar B |
| [HADOOP-13552](https://issues.apache.org/jira/browse/HADOOP-13552) | RetryInvocationHandler logs all remote exceptions |  Blocker | ipc | Jason Lowe | Jason Lowe |
| [HADOOP-12765](https://issues.apache.org/jira/browse/HADOOP-12765) | HttpServer2 should switch to using the non-blocking SslSelectChannelConnector to prevent performance degradation when handling SSL connections |  Major | . | Min Shen | Min Shen |
| [MAPREDUCE-6768](https://issues.apache.org/jira/browse/MAPREDUCE-6768) | TestRecovery.testSpeculative failed with NPE |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [HADOOP-13559](https://issues.apache.org/jira/browse/HADOOP-13559) | Remove close() within try-with-resources in ChecksumFileSystem/ChecksumFs classes |  Minor | fs | Aaron Fabbri | Aaron Fabbri |
| [HDFS-4210](https://issues.apache.org/jira/browse/HDFS-4210) | Throw helpful exception when DNS entry for JournalNode cannot be resolved |  Trivial | ha, journal-node, namenode | Damien Hardy | John Zhuge |
| [MAPREDUCE-4784](https://issues.apache.org/jira/browse/MAPREDUCE-4784) | TestRecovery occasionally fails |  Major | mrv2, test | Jason Lowe | Haibo Chen |
| [HDFS-10760](https://issues.apache.org/jira/browse/HDFS-10760) | DataXceiver#run() should not log InvalidToken exception as an error |  Major | . | Pan Yuxuan | Pan Yuxuan |
| [HDFS-10729](https://issues.apache.org/jira/browse/HDFS-10729) | Improve log message for edit loading failures caused by FS limit checks. |  Major | namenode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-5221](https://issues.apache.org/jira/browse/YARN-5221) | Expose UpdateResourceRequest API to allow AM to request for change in container properties |  Major | . | Arun Suresh | Arun Suresh |
| [HADOOP-13375](https://issues.apache.org/jira/browse/HADOOP-13375) | o.a.h.security.TestGroupsCaching.testBackgroundRefreshCounters seems flaky |  Major | security, test | Mingliang Liu | Weiwei Yang |
| [YARN-5555](https://issues.apache.org/jira/browse/YARN-5555) | Scheduler UI: "% of Queue" is inaccurate if leaf queue is hierarchically nested. |  Minor | . | Eric Payne | Eric Payne |
| [YARN-5549](https://issues.apache.org/jira/browse/YARN-5549) | AMLauncher#createAMContainerLaunchContext() should not log the command to be launched indiscriminately |  Critical | resourcemanager | Daniel Templeton | Daniel Templeton |
| [HDFS-10841](https://issues.apache.org/jira/browse/HDFS-10841) | Remove duplicate or unused variable in appendFile() |  Minor | . | Kihwal Lee | Kihwal Lee |
| [HADOOP-13558](https://issues.apache.org/jira/browse/HADOOP-13558) | UserGroupInformation created from a Subject incorrectly tries to renew the Kerberos ticket |  Major | security | Alejandro Abdelnur | Xiao Chen |
| [HDFS-9038](https://issues.apache.org/jira/browse/HDFS-9038) | DFS reserved space is erroneously counted towards non-DFS used. |  Major | datanode | Chris Nauroth | Brahma Reddy Battula |
| [HDFS-10832](https://issues.apache.org/jira/browse/HDFS-10832) | Propagate ACL bit and isEncrypted bit in HttpFS FileStatus permissions |  Critical | httpfs | Andrew Wang | Andrew Wang |
| [YARN-5632](https://issues.apache.org/jira/browse/YARN-5632) | UPDATE\_EXECUTION\_TYPE causes UpdateContainerRequestPBImpl to throw |  Major | api | Jason Lowe | Jason Lowe |
| [HDFS-9781](https://issues.apache.org/jira/browse/HDFS-9781) | FsDatasetImpl#getBlockReports can occasionally throw NullPointerException |  Major | datanode | Wei-Chiu Chuang | Manoj Govindassamy |
| [HDFS-10830](https://issues.apache.org/jira/browse/HDFS-10830) | FsDatasetImpl#removeVolumes crashes with IllegalMonitorStateException when vol being removed is in use |  Major | hdfs | Manoj Govindassamy | Arpit Agarwal |
| [YARN-5190](https://issues.apache.org/jira/browse/YARN-5190) | Registering/unregistering container metrics triggered by ContainerEvent and ContainersMonitorEvent are conflict which cause uncaught exception in ContainerMonitorImpl |  Blocker | . | Junping Du | Junping Du |
| [HDFS-10856](https://issues.apache.org/jira/browse/HDFS-10856) | Update the comment of BPServiceActor$Scheduler#scheduleNextBlockReport |  Minor | documentation | Akira Ajisaka | Yiqun Lin |
| [YARN-5630](https://issues.apache.org/jira/browse/YARN-5630) | NM fails to start after downgrade from 2.8 to 2.7 |  Blocker | nodemanager | Jason Lowe | Jason Lowe |
| [HADOOP-13616](https://issues.apache.org/jira/browse/HADOOP-13616) | Broken code snippet area in Hadoop Benchmarking |  Minor | documentation | Kai Sasaki | Kai Sasaki |
| [HDFS-10862](https://issues.apache.org/jira/browse/HDFS-10862) | Typos in 4 log messages |  Trivial | . | Mehran Hassani | Mehran Hassani |
| [YARN-4232](https://issues.apache.org/jira/browse/YARN-4232) | TopCLI console support for HA mode |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-5655](https://issues.apache.org/jira/browse/YARN-5655) | TestContainerManagerSecurity#testNMTokens is asserting |  Major | . | Jason Lowe | Robert Kanter |
| [HDFS-10879](https://issues.apache.org/jira/browse/HDFS-10879) | TestEncryptionZonesWithKMS#testReadWrite fails intermittently |  Major | . | Xiao Chen | Xiao Chen |
| [YARN-5539](https://issues.apache.org/jira/browse/YARN-5539) | TimelineClient failed to retry on "java.net.SocketTimeoutException: Read timed out" |  Critical | yarn | Sumana Sathish | Junping Du |
| [HADOOP-13643](https://issues.apache.org/jira/browse/HADOOP-13643) | Math error in AbstractContractDistCpTest |  Minor | . | Aaron Fabbri | Aaron Fabbri |
| [HDFS-10886](https://issues.apache.org/jira/browse/HDFS-10886) | Replace "fs.default.name" with "fs.defaultFS" in viewfs document |  Minor | documentation, federation | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13535](https://issues.apache.org/jira/browse/HADOOP-13535) | Add jetty6 acceptor startup issue workaround to branch-2 |  Major | . | Wei-Chiu Chuang | Min Shen |
| [YARN-5664](https://issues.apache.org/jira/browse/YARN-5664) | Fix Yarn documentation to link to correct versions. |  Minor | . | Xiao Chen | Xiao Chen |
| [YARN-5663](https://issues.apache.org/jira/browse/YARN-5663) | Small refactor in ZKRMStateStore |  Minor | resourcemanager | Oleksii Dymytrov | Oleksii Dymytrov |
| [HADOOP-12597](https://issues.apache.org/jira/browse/HADOOP-12597) | In kms-site.xml configuration "hadoop.security.keystore.JavaKeyStoreProvider.password" should be updated with new name |  Minor | security | huangyitian | Surendra Singh Lilhore |
| [HADOOP-13638](https://issues.apache.org/jira/browse/HADOOP-13638) | KMS should set UGI's Configuration object properly |  Major | kms | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-9885](https://issues.apache.org/jira/browse/HDFS-9885) | Correct the distcp counters name while displaying counters |  Minor | distcp | Archana T | Surendra Singh Lilhore |
| [YARN-5660](https://issues.apache.org/jira/browse/YARN-5660) | Wrong audit constants are used in Get/Put of priority in RMWebService |  Trivial | resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-10889](https://issues.apache.org/jira/browse/HDFS-10889) | Remove outdated Fault Injection Framework documentaion |  Major | documentation | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10713](https://issues.apache.org/jira/browse/HDFS-10713) | Throttle FsNameSystem lock warnings |  Major | logging, namenode | Arpit Agarwal | Hanisha Koneru |
| [HDFS-10426](https://issues.apache.org/jira/browse/HDFS-10426) | TestPendingInvalidateBlock failed in trunk |  Major | test | Yiqun Lin | Yiqun Lin |
| [HDFS-10828](https://issues.apache.org/jira/browse/HDFS-10828) | Fix usage of FsDatasetImpl object lock in ReplicaMap |  Blocker | . | Arpit Agarwal | Arpit Agarwal |
| [YARN-5631](https://issues.apache.org/jira/browse/YARN-5631) | Missing refreshClusterMaxPriority usage in rmadmin help message |  Minor | . | Kai Sasaki | Kai Sasaki |
| [HDFS-9444](https://issues.apache.org/jira/browse/HDFS-9444) | Add utility to find set of available ephemeral ports to ServerSocketUtil |  Major | . | Brahma Reddy Battula | Masatake Iwasaki |
| [HDFS-10824](https://issues.apache.org/jira/browse/HDFS-10824) | MiniDFSCluster#storageCapacities has no effects on real capacity |  Major | . | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-10914](https://issues.apache.org/jira/browse/HDFS-10914) | Move remnants of oah.hdfs.client to hadoop-hdfs-client |  Critical | hdfs-client | Andrew Wang | Andrew Wang |
| [MAPREDUCE-6771](https://issues.apache.org/jira/browse/MAPREDUCE-6771) | RMContainerAllocator sends container diagnostics event after corresponding completion event |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [HADOOP-13640](https://issues.apache.org/jira/browse/HADOOP-13640) | Fix findbugs warning in VersionInfoMojo.java |  Major | . | Tsuyoshi Ozawa | Yuanbo Liu |
| [HDFS-10850](https://issues.apache.org/jira/browse/HDFS-10850) | getEZForPath should NOT throw FNF |  Blocker | hdfs | Daryn Sharp | Andrew Wang |
| [HDFS-10945](https://issues.apache.org/jira/browse/HDFS-10945) | Fix the Findbugwaring FSNamesystem#renameTo(String, String, boolean) in branch-2 |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10810](https://issues.apache.org/jira/browse/HDFS-10810) |  Setreplication removing block from underconstrcution temporarily when batch IBR is enabled. |  Major | namenode | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10944](https://issues.apache.org/jira/browse/HDFS-10944) | Correct the javadoc of dfsadmin#disallowSnapshot |  Minor | documentation | Jagadesh Kiran N | Jagadesh Kiran N |
| [HDFS-10947](https://issues.apache.org/jira/browse/HDFS-10947) | Correct the API name for truncate in webhdfs document |  Major | documentation | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-12667](https://issues.apache.org/jira/browse/HADOOP-12667) | s3a: Support createNonRecursive API |  Major | fs/s3 | Sean Mackrory | Sean Mackrory |
| [HDFS-10609](https://issues.apache.org/jira/browse/HDFS-10609) | Uncaught InvalidEncryptionKeyException during pipeline recovery may abort downstream applications |  Major | encryption | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-10962](https://issues.apache.org/jira/browse/HDFS-10962) | TestRequestHedgingProxyProvider is flaky |  Major | test | Andrew Wang | Andrew Wang |
| [MAPREDUCE-6740](https://issues.apache.org/jira/browse/MAPREDUCE-6740) | Enforce mapreduce.task.timeout to be at least mapreduce.task.progress-report.interval |  Minor | mr-am | Haibo Chen | Haibo Chen |
| [YARN-5101](https://issues.apache.org/jira/browse/YARN-5101) | YARN\_APPLICATION\_UPDATED event is parsed in ApplicationHistoryManagerOnTimelineStore#convertToApplicationReport with reversed order |  Major | . | Xuan Gong | Sunil G |
| [YARN-5659](https://issues.apache.org/jira/browse/YARN-5659) | getPathFromYarnURL should use standard methods |  Major | . | Sergey Shelukhin | Sergey Shelukhin |
| [HADOOP-12611](https://issues.apache.org/jira/browse/HADOOP-12611) | TestZKSignerSecretProvider#testMultipleInit occasionally fail |  Major | . | Wei-Chiu Chuang | Eric Badger |
| [HDFS-10797](https://issues.apache.org/jira/browse/HDFS-10797) | Disk usage summary of snapshots causes renamed blocks to get counted twice |  Major | snapshots | Sean Mackrory | Sean Mackrory |
| [HDFS-10991](https://issues.apache.org/jira/browse/HDFS-10991) | Export hdfsTruncateFile symbol in libhdfs |  Blocker | libhdfs | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HADOOP-13700](https://issues.apache.org/jira/browse/HADOOP-13700) | Remove unthrown IOException from TrashPolicy#initialize and #getInstance signatures |  Critical | fs | Haibo Chen | Andrew Wang |
| [HDFS-11002](https://issues.apache.org/jira/browse/HDFS-11002) | Fix broken attr/getfattr/setfattr links in ExtendedAttributes.md |  Major | documentation | Mingliang Liu | Mingliang Liu |
| [HDFS-11000](https://issues.apache.org/jira/browse/HDFS-11000) | webhdfs PUT does not work if requests are routed to call queue. |  Major | . | Kihwal Lee | Kihwal Lee |
| [HDFS-10987](https://issues.apache.org/jira/browse/HDFS-10987) | Make Decommission less expensive when lot of blocks present. |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13024](https://issues.apache.org/jira/browse/HADOOP-13024) | Distcp with -delete feature on raw data not implemented |  Major | tools/distcp | Mavin Martin | Mavin Martin |
| [HDFS-10986](https://issues.apache.org/jira/browse/HDFS-10986) | DFSAdmin should log detailed error message if any |  Major | tools | Mingliang Liu | Mingliang Liu |
| [HDFS-10990](https://issues.apache.org/jira/browse/HDFS-10990) | TestPendingInvalidateBlock should wait for IBRs |  Minor | . | Yiqun Lin | Yiqun Lin |
| [HDFS-10735](https://issues.apache.org/jira/browse/HDFS-10735) | Distcp using webhdfs on secure HA clusters fails with StandbyException |  Major | webhdfs | Benoy Antony | Benoy Antony |
| [HDFS-10883](https://issues.apache.org/jira/browse/HDFS-10883) | `getTrashRoot`'s behavior is not consistent in DFS after enabling EZ. |  Major | . | Yuanbo Liu | Yuanbo Liu |
| [HADOOP-13707](https://issues.apache.org/jira/browse/HADOOP-13707) | If kerberos is enabled while HTTP SPNEGO is not configured, some links cannot be accessed |  Major | . | Yuanbo Liu | Yuanbo Liu |
| [HDFS-10301](https://issues.apache.org/jira/browse/HDFS-10301) | BlockReport retransmissions may lead to storages falsely being declared zombie if storage report processing happens out of order |  Critical | namenode | Konstantin Shvachko | Vinitha Reddy Gankidi |
| [HDFS-10712](https://issues.apache.org/jira/browse/HDFS-10712) | Fix TestDataNodeVolumeFailure on 2.\* branches. |  Major | . | Konstantin Shvachko | Vinitha Reddy Gankidi |
| [HDFS-10920](https://issues.apache.org/jira/browse/HDFS-10920) | TestStorageMover#testNoSpaceDisk is failing intermittently |  Major | test | Rakesh R | Rakesh R |
| [HDFS-10960](https://issues.apache.org/jira/browse/HDFS-10960) | TestDataNodeHotSwapVolumes#testRemoveVolumeBeingWritten fails at disk error verification after volume remove |  Minor | hdfs | Manoj Govindassamy | Manoj Govindassamy |
| [HDFS-10752](https://issues.apache.org/jira/browse/HDFS-10752) | Several log refactoring/improvement suggestion in HDFS |  Major | . | Nemo Chen | Hanisha Koneru |
| [HDFS-11025](https://issues.apache.org/jira/browse/HDFS-11025) | TestDiskspaceQuotaUpdate fails in trunk due to Bind exception |  Minor | . | Yiqun Lin | Yiqun Lin |
| [HDFS-11018](https://issues.apache.org/jira/browse/HDFS-11018) | Incorrect check and message in FsDatasetImpl#invalidate |  Major | datanode | Wei-Chiu Chuang | Yiqun Lin |
| [HADOOP-13236](https://issues.apache.org/jira/browse/HADOOP-13236) | truncate will fail when we use viewfilesystem |  Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13749](https://issues.apache.org/jira/browse/HADOOP-13749) | KMSClientProvider combined with KeyProviderCache can result in wrong UGI being used |  Critical | . | Sergey Shelukhin | Xiaoyu Yao |
| [HDFS-11042](https://issues.apache.org/jira/browse/HDFS-11042) | Add missing cleanupSSLConfig() call for tests that use setupSSLConfig() |  Major | test | Kuhu Shukla | Kuhu Shukla |
| [HDFS-11015](https://issues.apache.org/jira/browse/HDFS-11015) | Enforce timeout in balancer |  Major | balancer & mover | Kihwal Lee | Kihwal Lee |
| [YARN-5677](https://issues.apache.org/jira/browse/YARN-5677) | RM should transition to standby when connection is lost for an extended period |  Critical | resourcemanager | Daniel Templeton | Daniel Templeton |
| [HDFS-11054](https://issues.apache.org/jira/browse/HDFS-11054) | Suppress verbose log message in BlockPlacementPolicyDefault |  Major | . | Arpit Agarwal | Chen Liang |
| [HDFS-11050](https://issues.apache.org/jira/browse/HDFS-11050) | Change log level to 'warn' when ssl initialization fails and defaults to DEFAULT\_TIMEOUT\_CONN\_CONFIGURATOR |  Major | . | Kuhu Shukla | Kuhu Shukla |
| [HDFS-8492](https://issues.apache.org/jira/browse/HDFS-8492) | DN should notify NN when client requests a missing block |  Major | . | Daryn Sharp | Walter Su |
| [MAPREDUCE-6541](https://issues.apache.org/jira/browse/MAPREDUCE-6541) | Exclude scheduled reducer memory when calculating available mapper slots from headroom to avoid deadlock |  Major | . | Wangda Tan | Varun Saxena |
| [YARN-3848](https://issues.apache.org/jira/browse/YARN-3848) | TestNodeLabelContainerAllocation is not timing out |  Major | test | Jason Lowe | Varun Saxena |
| [HADOOP-13201](https://issues.apache.org/jira/browse/HADOOP-13201) | Print the directory paths when ViewFs denies the rename operation on internal dirs |  Major | viewfs | Tianyin Xu | Rakesh R |
| [YARN-4831](https://issues.apache.org/jira/browse/YARN-4831) | Recovered containers will be killed after NM stateful restart |  Major | nodemanager | Siqi Li | Siqi Li |
| [YARN-3432](https://issues.apache.org/jira/browse/YARN-3432) | Cluster metrics have wrong Total Memory when there is reserved memory on CS |  Major | capacityscheduler, resourcemanager | Thomas Graves | Brahma Reddy Battula |
| [HDFS-9500](https://issues.apache.org/jira/browse/HDFS-9500) | datanodesSoftwareVersions map may counting wrong when rolling upgrade |  Major | . | Phil Yang | Erik Krogen |
| [MAPREDUCE-2631](https://issues.apache.org/jira/browse/MAPREDUCE-2631) | Potential resource leaks in BinaryProtocol$TeeOutputStream.java |  Major | . | Ravi Teja Ch N V | Sunil G |
| [HADOOP-13770](https://issues.apache.org/jira/browse/HADOOP-13770) | Shell.checkIsBashSupported swallowed an interrupted exception |  Blocker | util | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-5027](https://issues.apache.org/jira/browse/YARN-5027) | NM should clean up app log dirs after NM restart |  Major | nodemanager | sandflee | sandflee |
| [YARN-5767](https://issues.apache.org/jira/browse/YARN-5767) | Fix the order that resources are cleaned up from the local Public/Private caches |  Major | . | Chris Trezzo | Chris Trezzo |
| [HDFS-11061](https://issues.apache.org/jira/browse/HDFS-11061) | Update dfs -count -t command line help and documentation |  Minor | documentation, fs | Wei-Chiu Chuang | Yiqun Lin |
| [YARN-5773](https://issues.apache.org/jira/browse/YARN-5773) | RM recovery too slow due to LeafQueue#activateApplication() |  Critical | capacity scheduler, rolling upgrade | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-10455](https://issues.apache.org/jira/browse/HDFS-10455) | Logging the username when deny the setOwner operation |  Minor | namenode | Tianyin Xu | Rakesh R |
| [HADOOP-13773](https://issues.apache.org/jira/browse/HADOOP-13773) | wrong HADOOP\_CLIENT\_OPTS in hadoop-env  on branch-2 |  Major | conf | Fei Hui | Fei Hui |
| [YARN-5001](https://issues.apache.org/jira/browse/YARN-5001) | Aggregated Logs root directory is created with wrong group if nonexistent |  Major | log-aggregation, nodemanager, security | Haibo Chen | Haibo Chen |
| [YARN-5815](https://issues.apache.org/jira/browse/YARN-5815) | Random failure of TestApplicationPriority.testOrderOfActivatingThePriorityApplicationOnRMRestart |  Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-11097](https://issues.apache.org/jira/browse/HDFS-11097) | Fix the jenkins warning related to the deprecated method StorageReceivedDeletedBlocks |  Major | . | Yiqun Lin | Yiqun Lin |
| [YARN-5837](https://issues.apache.org/jira/browse/YARN-5837) | NPE when getting node status of a decommissioned node after an RM restart |  Major | . | Robert Kanter | Robert Kanter |
| [HADOOP-13798](https://issues.apache.org/jira/browse/HADOOP-13798) | TestHadoopArchives times out |  Major | test | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-13797](https://issues.apache.org/jira/browse/HADOOP-13797) | Remove hardcoded absolute path for ls |  Major | util | Christine Koppelt | Christine Koppelt |
| [HADOOP-13804](https://issues.apache.org/jira/browse/HADOOP-13804) | MutableStat mean loses accuracy if add(long, long) is used |  Minor | metrics | Erik Krogen | Erik Krogen |
| [HDFS-11128](https://issues.apache.org/jira/browse/HDFS-11128) | CreateEditsLog throws NullPointerException |  Major | hdfs | Hanisha Koneru | Hanisha Koneru |
| [HDFS-11129](https://issues.apache.org/jira/browse/HDFS-11129) | TestAppendSnapshotTruncate fails with bind exception |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-13813](https://issues.apache.org/jira/browse/HADOOP-13813) | TestDelegationTokenFetcher#testDelegationTokenWithoutRenewer is failing |  Major | security, test | Mingliang Liu | Mingliang Liu |
| [HDFS-11087](https://issues.apache.org/jira/browse/HDFS-11087) | NamenodeFsck should check if the output writer is still writable. |  Major | namenode | Konstantin Shvachko | Erik Krogen |
| [HDFS-11135](https://issues.apache.org/jira/browse/HDFS-11135) | The tests in TestBalancer run fails due to NPE |  Major | test | Yiqun Lin | Yiqun Lin |
| [HDFS-11056](https://issues.apache.org/jira/browse/HDFS-11056) | Concurrent append and read operations lead to checksum error |  Major | datanode, httpfs | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [MAPREDUCE-6797](https://issues.apache.org/jira/browse/MAPREDUCE-6797) | Job history server scans can become blocked on a single, slow entry |  Critical | jobhistoryserver | Prabhu Joseph | Prabhu Joseph |
| [YARN-4355](https://issues.apache.org/jira/browse/YARN-4355) | NPE while processing localizer heartbeat |  Major | nodemanager | Jason Lowe | Varun Saxena |
| [YARN-4218](https://issues.apache.org/jira/browse/YARN-4218) | Metric for resource\*time that was preempted |  Major | resourcemanager | Chang Li | Chang Li |
| [YARN-5875](https://issues.apache.org/jira/browse/YARN-5875) | TestTokenClientRMService#testTokenRenewalWrongUser fails |  Major | . | Varun Saxena | Gergely Novák |
| [HADOOP-13815](https://issues.apache.org/jira/browse/HADOOP-13815) | TestKMS#testDelegationTokensOpsSimple and TestKMS#testDelegationTokensOpsKerberized Fails in Trunk |  Major | test | Brahma Reddy Battula | Xiao Chen |
| [YARN-5836](https://issues.apache.org/jira/browse/YARN-5836) | Malicious AM can kill containers of other apps running in any node its containers are running |  Minor | nodemanager | Botong Huang | Botong Huang |
| [HDFS-11134](https://issues.apache.org/jira/browse/HDFS-11134) | Fix bind exception threw in TestRenameWhileOpen |  Major | . | Yiqun Lin | Yiqun Lin |
| [MAPREDUCE-6801](https://issues.apache.org/jira/browse/MAPREDUCE-6801) | Fix flaky TestKill.testKillJob() |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [HADOOP-13814](https://issues.apache.org/jira/browse/HADOOP-13814) | Sample configuration of KMS HTTP Authentication signature is misleading |  Minor | conf, documentation, kms | Masahiro Tanaka | Masahiro Tanaka |
| [HDFS-11144](https://issues.apache.org/jira/browse/HDFS-11144) | TestFileCreationDelete#testFileCreationDeleteParent fails wind bind exception |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-11101](https://issues.apache.org/jira/browse/HDFS-11101) | TestDFSShell#testMoveWithTargetPortEmpty fails intermittently |  Major | test | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-5859](https://issues.apache.org/jira/browse/YARN-5859) | TestResourceLocalizationService#testParallelDownloadAttemptsForPublicResource sometimes fails |  Major | test | Jason Lowe | Eric Badger |
| [HADOOP-13663](https://issues.apache.org/jira/browse/HADOOP-13663) | Index out of range in SysInfoWindows |  Major | scripts | Inigo Goiri | Inigo Goiri |
| [HDFS-11174](https://issues.apache.org/jira/browse/HDFS-11174) | Wrong HttpFS test command in doc |  Minor | documentation, httpfs | John Zhuge | John Zhuge |
| [HADOOP-13820](https://issues.apache.org/jira/browse/HADOOP-13820) | Replace ugi.getUsername() with ugi.getShortUserName() in viewFS |  Minor | viewfs | Archana T | Brahma Reddy Battula |
| [HADOOP-13838](https://issues.apache.org/jira/browse/HADOOP-13838) | KMSTokenRenewer should close providers |  Critical | kms | Xiao Chen | Xiao Chen |
| [HADOOP-13830](https://issues.apache.org/jira/browse/HADOOP-13830) | Intermittent failure of ITestS3NContractRootDir#testRecursiveRootListing: "Can not create a Path from an empty string" |  Minor | fs/s3, test | Steve Loughran | Steve Loughran |
| [YARN-5915](https://issues.apache.org/jira/browse/YARN-5915) | ATS 1.5 FileSystemTimelineWriter causes flush() to be called after every event write |  Major | timelineserver | Atul Sikaria | Atul Sikaria |
| [MAPREDUCE-6815](https://issues.apache.org/jira/browse/MAPREDUCE-6815) | Fix flaky TestKill.testKillTask() |  Major | mrv2 | Haibo Chen | Haibo Chen |
| [HDFS-11181](https://issues.apache.org/jira/browse/HDFS-11181) | Fuse wrapper has a typo |  Trivial | fuse-dfs | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-13847](https://issues.apache.org/jira/browse/HADOOP-13847) | KMSWebApp should close KeyProviderCryptoExtension |  Major | kms | Anthony Young-Garner | John Zhuge |
| [YARN-5559](https://issues.apache.org/jira/browse/YARN-5559) | Analyse 2.8.0/3.0.0 jdiff reports and fix any issues |  Blocker | resourcemanager | Wangda Tan | Akira Ajisaka |
| [HADOOP-13861](https://issues.apache.org/jira/browse/HADOOP-13861) | Spelling errors in logging and exceptions for code |  Major | common, fs, io, security | Grant Sohn | Grant Sohn |
| [HDFS-11180](https://issues.apache.org/jira/browse/HDFS-11180) | Intermittent deadlock in NameNode when failover happens. |  Blocker | namenode | Abhishek Modi | Akira Ajisaka |
| [HDFS-11198](https://issues.apache.org/jira/browse/HDFS-11198) | NN UI should link DN web address using hostnames |  Critical | . | Kihwal Lee | Weiwei Yang |
| [MAPREDUCE-6816](https://issues.apache.org/jira/browse/MAPREDUCE-6816) | Progress bars in Web UI always at 100% |  Blocker | webapps | Shen Yinjie | Shen Yinjie |
| [YARN-5184](https://issues.apache.org/jira/browse/YARN-5184) | Fix up incompatible changes introduced on ContainerStatus and NodeReport |  Blocker | api | Karthik Kambatla | Sangjin Lee |
| [YARN-5921](https://issues.apache.org/jira/browse/YARN-5921) | Incorrect synchronization in RMContextImpl#setHAServiceState/getHAServiceState |  Major | . | Varun Saxena | Varun Saxena |
| [HDFS-11140](https://issues.apache.org/jira/browse/HDFS-11140) | Directory Scanner should log startup message time correctly |  Minor | . | Xiao Chen | Yiqun Lin |
| [HDFS-11223](https://issues.apache.org/jira/browse/HDFS-11223) | Fix typos in HttpFs documentations |  Trivial | documentation | Yiqun Lin | Yiqun Lin |
| [HDFS-11197](https://issues.apache.org/jira/browse/HDFS-11197) | Listing encryption zones fails when deleting a EZ that is on a snapshotted directory |  Minor | hdfs | Wellington Chevreuil | Wellington Chevreuil |
| [HDFS-11224](https://issues.apache.org/jira/browse/HDFS-11224) | Lifeline message should be ignored for dead nodes |  Critical | . | Vinayakumar B | Vinayakumar B |
| [HADOOP-13824](https://issues.apache.org/jira/browse/HADOOP-13824) | FsShell can suppress the real error if no error message is present |  Major | fs | Rob Vesse | John Zhuge |
| [MAPREDUCE-6820](https://issues.apache.org/jira/browse/MAPREDUCE-6820) | Fix dead links in Job relevant classes |  Minor | documentation | Yiqun Lin | Yiqun Lin |
| [HDFS-8870](https://issues.apache.org/jira/browse/HDFS-8870) | Lease is leaked on write failure |  Major | hdfs-client | Rushabh S Shah | Kuhu Shukla |
| [HADOOP-13565](https://issues.apache.org/jira/browse/HADOOP-13565) | KerberosAuthenticationHandler#authenticate should not rebuild SPN based on client request |  Major | security | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-11229](https://issues.apache.org/jira/browse/HDFS-11229) | HDFS-11056 failed to close meta file |  Blocker | datanode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-10570](https://issues.apache.org/jira/browse/HDFS-10570) | Remove classpath conflicts of netty-all jar in hadoop-hdfs-client |  Minor | test | Vinayakumar B | Vinayakumar B |
| [HDFS-10684](https://issues.apache.org/jira/browse/HDFS-10684) | WebHDFS DataNode calls fail without parameter createparent |  Blocker | webhdfs | Samuel Low | John Zhuge |
| [HDFS-11204](https://issues.apache.org/jira/browse/HDFS-11204) | Document the missing options of hdfs zkfc command |  Minor | documentation | Yiqun Lin | Yiqun Lin |
| [HADOOP-13890](https://issues.apache.org/jira/browse/HADOOP-13890) | Maintain HTTP/host as SPNEGO SPN support and fix KerberosName parsing |  Major | test | Brahma Reddy Battula | Xiaoyu Yao |
| [HDFS-11094](https://issues.apache.org/jira/browse/HDFS-11094) | Send back HAState along with NamespaceInfo during a versionRequest as an optional parameter |  Major | datanode | Eric Badger | Eric Badger |
| [HDFS-11160](https://issues.apache.org/jira/browse/HDFS-11160) | VolumeScanner reports write-in-progress replicas as corrupt incorrectly |  Major | datanode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-11263](https://issues.apache.org/jira/browse/HDFS-11263) | ClassCastException when we use Bzipcodec for Fsimage compression |  Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-11195](https://issues.apache.org/jira/browse/HDFS-11195) | Return error when appending files by webhdfs rest api fails |  Major | . | Yuanbo Liu | Yuanbo Liu |
| [HDFS-11261](https://issues.apache.org/jira/browse/HDFS-11261) | Document missing NameNode metrics |  Minor | documentation | Yiqun Lin | Yiqun Lin |
| [HDFS-11258](https://issues.apache.org/jira/browse/HDFS-11258) | File mtime change could not save to editlog |  Critical | . | Jimmy Xiang | Jimmy Xiang |
| [HDFS-11271](https://issues.apache.org/jira/browse/HDFS-11271) | Typo in NameNode UI |  Trivial | namenode, ui | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-11250](https://issues.apache.org/jira/browse/HDFS-11250) | Fix a typo in ReplicaUnderRecovery#setRecoveryID |  Trivial | . | Yiqun Lin | Yiqun Lin |
| [HDFS-11270](https://issues.apache.org/jira/browse/HDFS-11270) | Document the missing options of NameNode bootstrap command |  Minor | documentation | Yiqun Lin | Yiqun Lin |
| [HDFS-11252](https://issues.apache.org/jira/browse/HDFS-11252) | TestFileTruncate#testTruncateWithDataNodesRestartImmediately can fail with BindException |  Major | . | Jason Lowe | Yiqun Lin |
| [YARN-6024](https://issues.apache.org/jira/browse/YARN-6024) | Capacity Scheduler 'continuous reservation looking' doesn't work when sum of queue's used and reserved resources is equal to max |  Major | . | Wangda Tan | Wangda Tan |
| [HADOOP-13883](https://issues.apache.org/jira/browse/HADOOP-13883) | Add description of -fs option in generic command usage |  Minor | documentation | Yiqun Lin | Yiqun Lin |
| [YARN-6029](https://issues.apache.org/jira/browse/YARN-6029) | CapacityScheduler deadlock when ParentQueue#getQueueUserAclInfo is called by one thread and LeafQueue#assignContainers is releasing excessive reserved container by another thread |  Critical | capacityscheduler | Tao Yang | Tao Yang |
| [HADOOP-12733](https://issues.apache.org/jira/browse/HADOOP-12733) | Remove references to obsolete io.seqfile configuration variables |  Minor | . | Ray Chiang | Ray Chiang |
| [HDFS-11280](https://issues.apache.org/jira/browse/HDFS-11280) | Allow WebHDFS to reuse HTTP connections to NN |  Major | hdfs | Zheng Shao | Zheng Shao |
| [MAPREDUCE-6711](https://issues.apache.org/jira/browse/MAPREDUCE-6711) | JobImpl fails to handle preemption events on state COMMITTING |  Major | . | Li Lu | Prabhu Joseph |
| [HADOOP-13958](https://issues.apache.org/jira/browse/HADOOP-13958) | Bump up release year to 2017 |  Blocker | . | Junping Du | Junping Du |
| [YARN-6068](https://issues.apache.org/jira/browse/YARN-6068) | Log aggregation get failed when NM restart even with recovery |  Blocker | . | Junping Du | Junping Du |
| [YARN-4148](https://issues.apache.org/jira/browse/YARN-4148) | When killing app, RM releases app's resource before they are released by NM |  Major | resourcemanager | Jun Gong | Jason Lowe |
| [HDFS-11312](https://issues.apache.org/jira/browse/HDFS-11312) | Fix incompatible tag number change for nonDfsUsed in DatanodeInfoProto |  Blocker | . | Sean Mackrory | Sean Mackrory |
| [YARN-6072](https://issues.apache.org/jira/browse/YARN-6072) | RM unable to start in secure mode |  Blocker | resourcemanager | Bibin A Chundatt | Ajith S |
| [HDFS-10733](https://issues.apache.org/jira/browse/HDFS-10733) | NameNode terminated after full GC thinking QJM is unresponsive. |  Major | namenode, qjm | Konstantin Shvachko | Vinitha Reddy Gankidi |
| [HADOOP-14001](https://issues.apache.org/jira/browse/HADOOP-14001) | Improve delegation token validity checking |  Major | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-11376](https://issues.apache.org/jira/browse/HDFS-11376) | Revert HDFS-8377 Support HTTP/2 in datanode |  Major | datanode | Andrew Wang | Xiao Chen |
| [YARN-6151](https://issues.apache.org/jira/browse/YARN-6151) | FS preemption does not consider child queues over fairshare if the parent is under |  Major | fairscheduler | Yufei Gu | Yufei Gu |
| [YARN-5271](https://issues.apache.org/jira/browse/YARN-5271) | ATS client doesn't work with Jersey 2 on the classpath |  Major | client, timelineserver | Steve Loughran | Weiwei Yang |
| [YARN-3933](https://issues.apache.org/jira/browse/YARN-3933) | FairScheduler: Multiple calls to completedContainer are not safe |  Major | fairscheduler | Lavkesh Lahngir | Shiwei Guo |
| [YARN-6177](https://issues.apache.org/jira/browse/YARN-6177) | Yarn client should exit with an informative error message if an incompatible Jersey library is used at client |  Major | . | Weiwei Yang | Weiwei Yang |
| [HDFS-11379](https://issues.apache.org/jira/browse/HDFS-11379) | DFSInputStream may infinite loop requesting block locations |  Critical | hdfs-client | Daryn Sharp | Daryn Sharp |
| [HADOOP-14092](https://issues.apache.org/jira/browse/HADOOP-14092) | Typo in hadoop-aws index.md |  Trivial | fs/s3 | John Zhuge | John Zhuge |
| [HADOOP-13826](https://issues.apache.org/jira/browse/HADOOP-13826) | S3A Deadlock in multipart copy due to thread pool limits. |  Critical | fs/s3 | Sean Mackrory | Sean Mackrory |
| [HADOOP-14017](https://issues.apache.org/jira/browse/HADOOP-14017) | User friendly name for ADLS user and group |  Major | fs/adl | John Zhuge | Vishwajeet Dusane |
| [YARN-6175](https://issues.apache.org/jira/browse/YARN-6175) | FairScheduler: Negative vcore for resource needed to preempt |  Major | fairscheduler | Yufei Gu | Yufei Gu |
| [HADOOP-14028](https://issues.apache.org/jira/browse/HADOOP-14028) | S3A BlockOutputStreams doesn't delete temporary files in multipart uploads or handle part upload failures |  Critical | fs/s3 | Seth Fitzsimmons | Steve Loughran |
| [YARN-1728](https://issues.apache.org/jira/browse/YARN-1728) | Workaround guice3x-undecoded pathInfo in YARN WebApp |  Major | . | Abraham Elmahrek | Yuanbo Liu |
| [HADOOP-12979](https://issues.apache.org/jira/browse/HADOOP-12979) | IOE in S3a:  ${hadoop.tmp.dir}/s3a not configured |  Major | . | Steve Loughran | Steve Loughran |
| [YARN-6270](https://issues.apache.org/jira/browse/YARN-6270) | WebUtils.getRMWebAppURLWithScheme() needs to honor RM HA setting |  Major | . | Sumana Sathish | Xuan Gong |
| [HDFS-11498](https://issues.apache.org/jira/browse/HDFS-11498) | Make RestCsrfPreventionHandler and WebHdfsHandler compatible with Netty 4.0 |  Major | . | Andrew Wang | Andrew Wang |
| [HADOOP-14087](https://issues.apache.org/jira/browse/HADOOP-14087) | S3A typo in pom.xml test exclusions |  Major | fs/s3 | Aaron Fabbri | Aaron Fabbri |
| [HADOOP-14062](https://issues.apache.org/jira/browse/HADOOP-14062) | ApplicationMasterProtocolPBClientImpl.allocate fails with EOFException when RPC privacy is enabled |  Critical | . | Steven Rand | Steven Rand |
| [HDFS-11431](https://issues.apache.org/jira/browse/HDFS-11431) | hadoop-hdfs-client JAR does not include ConfiguredFailoverProxyProvider |  Blocker | build, hdfs-client | Steven Rand | Steven Rand |


### TESTS:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [MAPREDUCE-6191](https://issues.apache.org/jira/browse/MAPREDUCE-6191) | TestJavaSerialization fails with getting incorrect MR job result |  Minor | test | sam liu | sam liu |
| [YARN-3339](https://issues.apache.org/jira/browse/YARN-3339) | TestDockerContainerExecutor should pull a single image and not the entire centos repository |  Minor | test | Ravindra Kumar Naik | Ravindra Kumar Naik |
| [YARN-1880](https://issues.apache.org/jira/browse/YARN-1880) | Cleanup TestApplicationClientProtocolOnHA |  Trivial | test | Tsuyoshi Ozawa | Tsuyoshi Ozawa |
| [HDFS-6263](https://issues.apache.org/jira/browse/HDFS-6263) | Remove DRFA.MaxBackupIndex config from log4j.properties |  Minor | . | Akira Ajisaka | Abhiraj Butala |
| [HDFS-6408](https://issues.apache.org/jira/browse/HDFS-6408) | Remove redundant definitions in log4j.properties |  Minor | test | Abhiraj Butala | Abhiraj Butala |
| [YARN-2666](https://issues.apache.org/jira/browse/YARN-2666) | TestFairScheduler.testContinuousScheduling fails Intermittently |  Major | scheduler | Tsuyoshi Ozawa | zhihai xu |
| [HDFS-8247](https://issues.apache.org/jira/browse/HDFS-8247) | TestDiskspaceQuotaUpdate#testAppendOverTypeQuota is failing |  Major | test | Anu Engineer | Xiaoyu Yao |
| [HADOOP-11881](https://issues.apache.org/jira/browse/HADOOP-11881) | test-patch.sh javac result is wildly wrong |  Major | build, test | Allen Wittenauer | Kengo Seki |
| [HADOOP-11904](https://issues.apache.org/jira/browse/HADOOP-11904) | test-patch.sh goes into an infinite loop on non-maven builds |  Critical | test | Allen Wittenauer | Allen Wittenauer |
| [YARN-3343](https://issues.apache.org/jira/browse/YARN-3343) | TestCapacitySchedulerNodeLabelUpdate.testNodeUpdate sometime fails in trunk |  Minor | . | Xuan Gong | Rohith Sharma K S |
| [YARN-3580](https://issues.apache.org/jira/browse/YARN-3580) | [JDK 8] TestClientRMService.testGetLabelsToNodes fails |  Major | test | Robert Kanter | Robert Kanter |
| [HDFS-7559](https://issues.apache.org/jira/browse/HDFS-7559) | Create unit test to automatically compare HDFS related classes and hdfs-default.xml |  Minor | . | Ray Chiang | Ray Chiang |
| [HADOOP-11906](https://issues.apache.org/jira/browse/HADOOP-11906) | test-patch.sh should use 'file' command for patch determinism |  Major | . | Allen Wittenauer | Sean Busbey |
| [YARN-3602](https://issues.apache.org/jira/browse/YARN-3602) | TestResourceLocalizationService.testPublicResourceInitializesLocalDir fails Intermittently due to IOException from cleanup |  Minor | test | zhihai xu | zhihai xu |
| [HDFS-8243](https://issues.apache.org/jira/browse/HDFS-8243) | Files written by TestHostsFiles and TestNameNodeMXBean are causing Release Audit Warnings. |  Minor | test | Ruth Wisniewski | Ruth Wisniewski |
| [HADOOP-11884](https://issues.apache.org/jira/browse/HADOOP-11884) | test-patch.sh should pull the real findbugs version |  Minor | test | Allen Wittenauer | Kengo Seki |
| [HADOOP-11944](https://issues.apache.org/jira/browse/HADOOP-11944) | add option to test-patch to avoid relocating patch process directory |  Minor | . | Sean Busbey | Sean Busbey |
| [HADOOP-11949](https://issues.apache.org/jira/browse/HADOOP-11949) | Add user-provided plugins to test-patch |  Major | . | Sean Busbey | Sean Busbey |
| [HADOOP-12000](https://issues.apache.org/jira/browse/HADOOP-12000) | cannot use --java-home in test-patch |  Major | scripts | Allen Wittenauer | Allen Wittenauer |
| [MAPREDUCE-6204](https://issues.apache.org/jira/browse/MAPREDUCE-6204) | TestJobCounters should use new properties instead of JobConf.MAPRED\_TASK\_JAVA\_OPTS |  Minor | test | sam liu | sam liu |
| [HADOOP-12035](https://issues.apache.org/jira/browse/HADOOP-12035) | shellcheck plugin displays a wrong version potentially |  Trivial | build | Kengo Seki | Kengo Seki |
| [HADOOP-12030](https://issues.apache.org/jira/browse/HADOOP-12030) | test-patch should only report on newly introduced findbugs warnings. |  Major | . | Sean Busbey | Sean Busbey |
| [HADOOP-11930](https://issues.apache.org/jira/browse/HADOOP-11930) | test-patch in offline mode should tell maven to be in offline mode |  Major | . | Sean Busbey | Sean Busbey |
| [HADOOP-11965](https://issues.apache.org/jira/browse/HADOOP-11965) | determine-flaky-tests needs a summary mode |  Minor | . | Allen Wittenauer | Yufei Gu |
| [HDFS-8645](https://issues.apache.org/jira/browse/HDFS-8645) | Resolve inconsistent code in TestReplicationPolicy between trunk and branch-2 |  Major | namenode | Zhe Zhang | Zhe Zhang |
| [YARN-2871](https://issues.apache.org/jira/browse/YARN-2871) | TestRMRestart#testRMRestartGetApplicationList sometime fails in trunk |  Minor | . | Ted Yu | zhihai xu |
| [YARN-3956](https://issues.apache.org/jira/browse/YARN-3956) | Fix TestNodeManagerHardwareUtils fails on Mac |  Minor | nodemanager | Varun Vasudev | Varun Vasudev |
| [HDFS-8834](https://issues.apache.org/jira/browse/HDFS-8834) | TestReplication#testReplicationWhenBlockCorruption is not valid after HDFS-6482 |  Minor | datanode | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [YARN-3992](https://issues.apache.org/jira/browse/YARN-3992) | TestApplicationPriority.testApplicationPriorityAllocation fails intermittently |  Major | . | Zhijie Shen | Sunil G |
| [HDFS-2070](https://issues.apache.org/jira/browse/HDFS-2070) | Add more unit tests for FsShell getmerge |  Major | test | XieXianshan | Daniel Templeton |
| [MAPREDUCE-5045](https://issues.apache.org/jira/browse/MAPREDUCE-5045) | UtilTest#isCygwin method appears to be unused |  Trivial | contrib/streaming, test | Chris Nauroth | Neelesh Srinivas Salian |
| [YARN-3573](https://issues.apache.org/jira/browse/YARN-3573) | MiniMRYarnCluster constructor that starts the timeline server using a boolean should be marked deprecated |  Major | timelineserver | Mit Desai | Brahma Reddy Battula |
| [HDFS-9295](https://issues.apache.org/jira/browse/HDFS-9295) | Add a thorough test of the full KMS code path |  Critical | security, test | Daniel Templeton | Daniel Templeton |
| [HDFS-9339](https://issues.apache.org/jira/browse/HDFS-9339) | Extend full test of KMS ACLs |  Major | test | Daniel Templeton | Daniel Templeton |
| [HDFS-9354](https://issues.apache.org/jira/browse/HDFS-9354) | Fix TestBalancer#testBalancerWithZeroThreadsForMove on Windows |  Major | test | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-9410](https://issues.apache.org/jira/browse/HDFS-9410) | Some tests should always reset sysout and syserr |  Minor | test | Xiao Chen | Xiao Chen |
| [HADOOP-12564](https://issues.apache.org/jira/browse/HADOOP-12564) |  Upgrade JUnit3 TestCase to JUnit 4 in org.apache.hadoop.io package |  Trivial | test | Dustin Cote | Dustin Cote |
| [HDFS-9153](https://issues.apache.org/jira/browse/HDFS-9153) | Pretty-format the output for DFSIO |  Major | . | Kai Zheng | Kai Zheng |
| [HDFS-9429](https://issues.apache.org/jira/browse/HDFS-9429) | Tests in TestDFSAdminWithHA intermittently fail with EOFException |  Major | test | Xiao Chen | Xiao Chen |
| [HADOOP-10729](https://issues.apache.org/jira/browse/HADOOP-10729) | Add tests for PB RPC in case version mismatch of client and server |  Major | ipc | Junping Du | Junping Du |
| [HDFS-7553](https://issues.apache.org/jira/browse/HDFS-7553) | fix the TestDFSUpgradeWithHA due to BindException |  Major | test | Liang Xie | Xiao Chen |
| [HDFS-9626](https://issues.apache.org/jira/browse/HDFS-9626) | TestBlockReplacement#testBlockReplacement fails occasionally |  Minor | test | Xiao Chen | Xiao Chen |
| [HADOOP-12696](https://issues.apache.org/jira/browse/HADOOP-12696) | Add Tests for S3FileSystem Contract |  Major | tools | Matthew Paduano | Matthew Paduano |
| [MAPREDUCE-6614](https://issues.apache.org/jira/browse/MAPREDUCE-6614) | Remove unnecessary code in TestMapreduceConfigFields |  Minor | test | Akira Ajisaka | Kai Sasaki |
| [HADOOP-12736](https://issues.apache.org/jira/browse/HADOOP-12736) | TestTimedOutTestsListener#testThreadDumpAndDeadlocks sometimes times out |  Major | . | Xiao Chen | Xiao Chen |
| [HADOOP-12715](https://issues.apache.org/jira/browse/HADOOP-12715) | TestValueQueue#testgetAtMostPolicyALL fails intermittently |  Major | . | Xiao Chen | Xiao Chen |
| [HDFS-9773](https://issues.apache.org/jira/browse/HDFS-9773) | Remove dead code related to SimulatedFSDataset in tests |  Minor | test | Akira Ajisaka | Brahma Reddy Battula |
| [HDFS-9888](https://issues.apache.org/jira/browse/HDFS-9888) | Allow reseting KerberosName in unit tests |  Minor | . | Xiao Chen | Xiao Chen |
| [YARN-4717](https://issues.apache.org/jira/browse/YARN-4717) | TestResourceLocalizationService.testPublicResourceInitializesLocalDir fails Intermittently due to IllegalArgumentException from cleanup |  Minor | nodemanager | Daniel Templeton | Daniel Templeton |
| [HDFS-9949](https://issues.apache.org/jira/browse/HDFS-9949) | Add a test case to ensure that the DataNode does not regenerate its UUID when a storage directory is cleared |  Minor | . | Harsh J | Harsh J |
| [HADOOP-12738](https://issues.apache.org/jira/browse/HADOOP-12738) | Create unit test to automatically compare Common related classes and core-default.xml |  Minor | . | Ray Chiang | Ray Chiang |
| [HADOOP-12101](https://issues.apache.org/jira/browse/HADOOP-12101) | Add automatic search of default Configuration variables to TestConfigurationFieldsBase |  Major | test | Ray Chiang | Ray Chiang |
| [YARN-4947](https://issues.apache.org/jira/browse/YARN-4947) | Test timeout is happening for TestRMWebServicesNodes |  Major | test | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-5069](https://issues.apache.org/jira/browse/YARN-5069) | TestFifoScheduler.testResourceOverCommit race condition |  Major | test | Eric Badger | Eric Badger |
| [YARN-5114](https://issues.apache.org/jira/browse/YARN-5114) | Add additional tests in TestRMWebServicesApps and rectify testInvalidAppAttempts failure in 2.8 |  Minor | . | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-10375](https://issues.apache.org/jira/browse/HDFS-10375) | Remove redundant TestMiniDFSCluster.testDualClusters |  Trivial | test | John Zhuge | Jiayi Zhou |
| [YARN-5023](https://issues.apache.org/jira/browse/YARN-5023) | TestAMRestart#testShouldNotCountFailureToMaxAttemptRetry random failure |  Major | . | Bibin A Chundatt | sandflee |
| [YARN-5318](https://issues.apache.org/jira/browse/YARN-5318) | TestRMAdminService#testRefreshNodesResourceWithFileSystemBasedConfigurationProvider fails intermittently. |  Minor | . | sandflee | Jun Gong |
| [YARN-5037](https://issues.apache.org/jira/browse/YARN-5037) | TestRMRestart#testQueueMetricsOnRMRestart random failure |  Major | . | sandflee | sandflee |
| [YARN-5317](https://issues.apache.org/jira/browse/YARN-5317) | testAMRestartNotLostContainerCompleteMsg may fail |  Minor | . | sandflee | sandflee |
| [YARN-5159](https://issues.apache.org/jira/browse/YARN-5159) | Wrong Javadoc tag in MiniYarnCluster |  Major | documentation | Andras Bokor | Andras Bokor |
| [MAPREDUCE-6738](https://issues.apache.org/jira/browse/MAPREDUCE-6738) | TestJobListCache.testAddExisting failed intermittently in slow VM testbed |  Minor | . | Junping Du | Junping Du |
| [YARN-5092](https://issues.apache.org/jira/browse/YARN-5092) | TestRMDelegationTokens fails intermittently |  Major | test | Rohith Sharma K S | Jason Lowe |
| [HADOOP-10980](https://issues.apache.org/jira/browse/HADOOP-10980) | TestActiveStandbyElector fails occasionally in trunk |  Minor | . | Ted Yu | Eric Badger |
| [HADOOP-13395](https://issues.apache.org/jira/browse/HADOOP-13395) | Enhance TestKMSAudit |  Minor | kms | Xiao Chen | Xiao Chen |
| [YARN-5492](https://issues.apache.org/jira/browse/YARN-5492) | TestSubmitApplicationWithRMHA is failing sporadically during precommit builds |  Major | test | Jason Lowe | Vrushali C |
| [YARN-5544](https://issues.apache.org/jira/browse/YARN-5544) | TestNodeBlacklistingOnAMFailures fails on trunk |  Major | test | Varun Saxena | Sunil G |
| [HDFS-9745](https://issues.apache.org/jira/browse/HDFS-9745) | TestSecureNNWithQJM#testSecureMode sometimes fails with timeouts |  Minor | . | Xiao Chen | Xiao Chen |
| [YARN-5389](https://issues.apache.org/jira/browse/YARN-5389) | TestYarnClient#testReservationDelete fails |  Major | . | Rohith Sharma K S | Sean Po |
| [YARN-5560](https://issues.apache.org/jira/browse/YARN-5560) | Clean up bad exception catching practices in TestYarnClient |  Major | . | Sean Po | Sean Po |
| [YARN-5608](https://issues.apache.org/jira/browse/YARN-5608) | TestAMRMClient.setup() fails with ArrayOutOfBoundsException |  Major | test | Daniel Templeton | Daniel Templeton |
| [HDFS-10657](https://issues.apache.org/jira/browse/HDFS-10657) | testAclCLI.xml setfacl test should expect mask r-x |  Minor | . | John Zhuge | John Zhuge |
| [HDFS-9333](https://issues.apache.org/jira/browse/HDFS-9333) | Some tests using MiniDFSCluster errored complaining port in use |  Minor | test | Kai Zheng | Masatake Iwasaki |
| [HADOOP-13686](https://issues.apache.org/jira/browse/HADOOP-13686) | Adding additional unit test for Trash (I) |  Major | . | Xiaoyu Yao | Weiwei Yang |
| [YARN-3568](https://issues.apache.org/jira/browse/YARN-3568) | TestAMRMTokens should use some random port |  Major | test | Gera Shegalov | Takashi Ohnishi |
| [MAPREDUCE-6804](https://issues.apache.org/jira/browse/MAPREDUCE-6804) | Add timeout when starting JobHistoryServer in MiniMRYarnCluster |  Minor | test | Andras Bokor | Andras Bokor |
| [HDFS-11272](https://issues.apache.org/jira/browse/HDFS-11272) | Refine the assert messages in TestFSDirAttrOp |  Minor | test | Akira Ajisaka | Jimmy Xiang |
| [HDFS-11278](https://issues.apache.org/jira/browse/HDFS-11278) | Add missing @Test annotation for TestSafeMode.testSafeModeUtils() |  Trivial | namenode | Lukas Majercak | Lukas Majercak |


### SUB-TASKS:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [YARN-3356](https://issues.apache.org/jira/browse/YARN-3356) | Capacity Scheduler FiCaSchedulerApp should use ResourceUsage to track used-resources-by-label. |  Major | capacityscheduler, resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-3345](https://issues.apache.org/jira/browse/YARN-3345) | Add non-exclusive node label API to RMAdmin protocol and NodeLabelsManager |  Major | api, client, resourcemanager | Wangda Tan | Wangda Tan |
| [HDFS-7854](https://issues.apache.org/jira/browse/HDFS-7854) | Separate class DataStreamer out of DFSOutputStream |  Major | hdfs-client | Li Bo | Li Bo |
| [HDFS-7713](https://issues.apache.org/jira/browse/HDFS-7713) | Implement mkdirs in the HDFS Web UI |  Major | ui | Ravi Prakash | Ravi Prakash |
| [YARN-2495](https://issues.apache.org/jira/browse/YARN-2495) | Allow admin specify labels from each NM (Distributed configuration) |  Major | resourcemanager | Wangda Tan | Naganarasimha G R |
| [HDFS-7893](https://issues.apache.org/jira/browse/HDFS-7893) | Update the POM to create a separate hdfs-client jar |  Major | build | Haohui Mai | Haohui Mai |
| [YARN-3365](https://issues.apache.org/jira/browse/YARN-3365) | Add support for using the 'tc' tool via container-executor |  Major | nodemanager | Sidharta Seethana | Sidharta Seethana |
| [HDFS-8034](https://issues.apache.org/jira/browse/HDFS-8034) | Fix TestDFSClientRetries#testDFSClientConfigurationLocateFollowingBlockInitialDelay for Windows |  Minor | test | Xiaoyu Yao | Xiaoyu Yao |
| [YARN-3110](https://issues.apache.org/jira/browse/YARN-3110) | Few issues in ApplicationHistory web ui |  Minor | applications, timelineserver | Bibin A Chundatt | Naganarasimha G R |
| [HDFS-8049](https://issues.apache.org/jira/browse/HDFS-8049) | Annotation client implementation as private |  Major | hdfs-client | Tsz Wo Nicholas Sze | Takuya Fukudome |
| [HDFS-8079](https://issues.apache.org/jira/browse/HDFS-8079) | Separate the client retry conf from DFSConfigKeys |  Major | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8080](https://issues.apache.org/jira/browse/HDFS-8080) | Separate JSON related routines used by WebHdfsFileSystem to a package local class |  Minor | hdfs-client | Haohui Mai | Haohui Mai |
| [HDFS-8085](https://issues.apache.org/jira/browse/HDFS-8085) | Move CorruptFileBlockIterator to the hdfs.client.impl package |  Minor | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8089](https://issues.apache.org/jira/browse/HDFS-8089) | Move o.a.h.hdfs.web.resources.\* to the client jars |  Minor | build | Haohui Mai | Haohui Mai |
| [HDFS-8102](https://issues.apache.org/jira/browse/HDFS-8102) | Separate webhdfs retry configuration keys from DFSConfigKeys |  Minor | hdfs-client | Haohui Mai | Haohui Mai |
| [YARN-1376](https://issues.apache.org/jira/browse/YARN-1376) | NM need to notify the log aggregation status to RM through Node heartbeat |  Major | . | Xuan Gong | Xuan Gong |
| [HDFS-8100](https://issues.apache.org/jira/browse/HDFS-8100) | Refactor DFSClient.Conf to a standalone class |  Minor | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8103](https://issues.apache.org/jira/browse/HDFS-8103) | Move BlockTokenSecretManager.AccessMode into BlockTokenIdentifier |  Minor | security | Haohui Mai | Haohui Mai |
| [HDFS-8084](https://issues.apache.org/jira/browse/HDFS-8084) | Separate the client failover conf from DFSConfigKeys |  Major | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8083](https://issues.apache.org/jira/browse/HDFS-8083) | Separate the client write conf from DFSConfigKeys |  Major | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [YARN-3347](https://issues.apache.org/jira/browse/YARN-3347) | Improve YARN log command to get AMContainer logs as well as running containers logs |  Major | log-aggregation | Xuan Gong | Xuan Gong |
| [YARN-3443](https://issues.apache.org/jira/browse/YARN-3443) | Create a 'ResourceHandler' subsystem to ease addition of support for new resource types on the NM |  Major | nodemanager | Sidharta Seethana | Sidharta Seethana |
| [HDFS-7701](https://issues.apache.org/jira/browse/HDFS-7701) | Support reporting per storage type quota and usage with hadoop/hdfs shell |  Major | datanode, namenode | Xiaoyu Yao | Peter Shi |
| [YARN-3361](https://issues.apache.org/jira/browse/YARN-3361) | CapacityScheduler side changes to support non-exclusive node labels |  Major | capacityscheduler | Wangda Tan | Wangda Tan |
| [YARN-3318](https://issues.apache.org/jira/browse/YARN-3318) | Create Initial OrderingPolicy Framework and FifoOrderingPolicy |  Major | scheduler | Craig Welch | Craig Welch |
| [YARN-3326](https://issues.apache.org/jira/browse/YARN-3326) | Support RESTful API for getLabelsToNodes |  Minor | resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [YARN-3354](https://issues.apache.org/jira/browse/YARN-3354) | Container should contains node-labels asked by original ResourceRequests |  Major | api, capacityscheduler, nodemanager, resourcemanager | Wangda Tan | Wangda Tan |
| [HDFS-8082](https://issues.apache.org/jira/browse/HDFS-8082) | Separate the client read conf from DFSConfigKeys |  Major | hdfs-client | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8165](https://issues.apache.org/jira/browse/HDFS-8165) | Move GRANDFATHER\_GENERATION\_STAMP and GRANDFATER\_INODE\_ID to hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [YARN-1402](https://issues.apache.org/jira/browse/YARN-1402) | Related Web UI, CLI changes on exposing client API to check log aggregation status |  Major | . | Xuan Gong | Xuan Gong |
| [YARN-2696](https://issues.apache.org/jira/browse/YARN-2696) | Queue sorting in CapacityScheduler should consider node label |  Major | capacityscheduler, resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-3487](https://issues.apache.org/jira/browse/YARN-3487) | CapacityScheduler scheduler lock obtained unnecessarily when calling getQueue |  Critical | capacityscheduler | Jason Lowe | Jason Lowe |
| [YARN-3136](https://issues.apache.org/jira/browse/YARN-3136) | getTransferredContainers can be a bottleneck during AM registration |  Major | scheduler | Jason Lowe | Sunil G |
| [HDFS-8169](https://issues.apache.org/jira/browse/HDFS-8169) | Move LocatedBlocks and related classes to hdfs-client |  Major | build, hdfs-client | Haohui Mai | Haohui Mai |
| [YARN-3463](https://issues.apache.org/jira/browse/YARN-3463) | Integrate OrderingPolicy Framework with CapacityScheduler |  Major | capacityscheduler | Craig Welch | Craig Welch |
| [HDFS-8185](https://issues.apache.org/jira/browse/HDFS-8185) | Separate client related routines in HAUtil into a new class |  Major | build, hdfs-client | Haohui Mai | Haohui Mai |
| [YARN-3225](https://issues.apache.org/jira/browse/YARN-3225) | New parameter or CLI for decommissioning node gracefully in RMAdmin CLI |  Major | graceful | Junping Du | Devaraj K |
| [HDFS-8218](https://issues.apache.org/jira/browse/HDFS-8218) | Move classes that used by ClientProtocol into hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [YARN-3366](https://issues.apache.org/jira/browse/YARN-3366) | Outbound network bandwidth : classify/shape traffic originating from YARN containers |  Major | . | Sidharta Seethana | Sidharta Seethana |
| [YARN-2605](https://issues.apache.org/jira/browse/YARN-2605) | [RM HA] Rest api endpoints doing redirect incorrectly |  Major | resourcemanager | bc Wong | Xuan Gong |
| [YARN-3319](https://issues.apache.org/jira/browse/YARN-3319) | Implement a FairOrderingPolicy |  Major | scheduler | Craig Welch | Craig Welch |
| [YARN-3413](https://issues.apache.org/jira/browse/YARN-3413) | Node label attributes (like exclusivity) should settable via addToClusterNodeLabels but shouldn't be changeable at runtime |  Major | api, client, resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-2498](https://issues.apache.org/jira/browse/YARN-2498) | Respect labels in preemption policy of capacity scheduler for inter-queue preemption |  Major | resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-2740](https://issues.apache.org/jira/browse/YARN-2740) | Fix NodeLabelsManager to properly handle node label modifications when distributed node label configuration enabled |  Major | resourcemanager | Wangda Tan | Naganarasimha G R |
| [YARN-3544](https://issues.apache.org/jira/browse/YARN-3544) | AM logs link missing in the RM UI for a completed app |  Blocker | . | Hitesh Shah | Xuan Gong |
| [YARN-2619](https://issues.apache.org/jira/browse/YARN-2619) | NodeManager: Add cgroups support for disk I/O isolation |  Major | . | Wei Yan | Varun Vasudev |
| [HDFS-8086](https://issues.apache.org/jira/browse/HDFS-8086) | Move LeaseRenewer to the hdfs.client.impl package |  Minor | hdfs-client | Tsz Wo Nicholas Sze | Takanobu Asanuma |
| [YARN-3006](https://issues.apache.org/jira/browse/YARN-3006) | Improve the error message when attempting manual failover with auto-failover enabled |  Minor | . | Akira Ajisaka | Akira Ajisaka |
| [HDFS-8249](https://issues.apache.org/jira/browse/HDFS-8249) | Separate HdfsConstants into the client and the server side class |  Major | hdfs-client | Haohui Mai | Haohui Mai |
| [HDFS-8309](https://issues.apache.org/jira/browse/HDFS-8309) | Skip unit test using DataNodeTestUtils#injectDataDirFailure() on Windows |  Minor | test | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-8237](https://issues.apache.org/jira/browse/HDFS-8237) | Move all protocol classes used by ClientProtocol to hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [HDFS-8314](https://issues.apache.org/jira/browse/HDFS-8314) | Move HdfsServerConstants#IO\_FILE\_BUFFER\_SIZE and SMALL\_BUFFER\_SIZE to the users |  Major | . | Haohui Mai | Li Lu |
| [HDFS-8310](https://issues.apache.org/jira/browse/HDFS-8310) | Fix TestCLI.testAll 'help: help for find' on Windows |  Minor | test | Xiaoyu Yao | Kiran Kumar M R |
| [YARN-3301](https://issues.apache.org/jira/browse/YARN-3301) | Fix the format issue of the new RM web UI and AHS web UI after YARN-3272 / YARN-3262 |  Major | resourcemanager | Xuan Gong | Xuan Gong |
| [YARN-3448](https://issues.apache.org/jira/browse/YARN-3448) | Add Rolling Time To Lives Level DB Plugin Capabilities |  Major | timelineserver | Jonathan Eagles | Jonathan Eagles |
| [YARN-2918](https://issues.apache.org/jira/browse/YARN-2918) | Don't fail RM if queue's configured labels are not existed in cluster-node-labels |  Major | resourcemanager | Rohith Sharma K S | Wangda Tan |
| [YARN-644](https://issues.apache.org/jira/browse/YARN-644) | Basic null check is not performed on passed in arguments before using them in ContainerManagerImpl.startContainer |  Minor | nodemanager | Omkar Vinit Joshi | Varun Saxena |
| [YARN-3593](https://issues.apache.org/jira/browse/YARN-3593) | Add label-type and Improve "DEFAULT\_PARTITION" in Node Labels Page |  Major | webapp | Naganarasimha G R | Naganarasimha G R |
| [YARN-2331](https://issues.apache.org/jira/browse/YARN-2331) | Distinguish shutdown during supervision vs. shutdown for rolling upgrade |  Major | nodemanager | Jason Lowe | Jason Lowe |
| [YARN-3579](https://issues.apache.org/jira/browse/YARN-3579) | CommonNodeLabelsManager should support NodeLabel instead of string label name when getting node-to-label/label-to-label mappings |  Minor | resourcemanager | Sunil G | Sunil G |
| [YARN-3505](https://issues.apache.org/jira/browse/YARN-3505) | Node's Log Aggregation Report with SUCCEED should not cached in RMApps |  Critical | log-aggregation | Junping Du | Xuan Gong |
| [HDFS-8403](https://issues.apache.org/jira/browse/HDFS-8403) | Eliminate retries in TestFileCreation#testOverwriteOpenForWrite |  Major | test | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8157](https://issues.apache.org/jira/browse/HDFS-8157) | Writes to RAM DISK reserve locked memory for block files |  Major | datanode | Arpit Agarwal | Arpit Agarwal |
| [YARN-3541](https://issues.apache.org/jira/browse/YARN-3541) | Add version info on timeline service / generic history web UI and REST API |  Major | timelineserver | Zhijie Shen | Zhijie Shen |
| [YARN-3565](https://issues.apache.org/jira/browse/YARN-3565) | NodeHeartbeatRequest/RegisterNodeManagerRequest should use NodeLabel object instead of String |  Blocker | api, client, resourcemanager | Wangda Tan | Naganarasimha G R |
| [YARN-3583](https://issues.apache.org/jira/browse/YARN-3583) | Support of NodeLabel object instead of plain String in YarnClient side. |  Major | client | Sunil G | Sunil G |
| [YARN-3609](https://issues.apache.org/jira/browse/YARN-3609) | Move load labels from storage from serviceInit to serviceStart to make it works with RM HA case. |  Major | resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-3684](https://issues.apache.org/jira/browse/YARN-3684) | Change ContainerExecutor's primary lifecycle methods to use a more extensible mechanism for passing information. |  Major | yarn | Sidharta Seethana | Sidharta Seethana |
| [HDFS-8454](https://issues.apache.org/jira/browse/HDFS-8454) | Remove unnecessary throttling in TestDatanodeDeath |  Major | test | Arpit Agarwal | Arpit Agarwal |
| [YARN-3632](https://issues.apache.org/jira/browse/YARN-3632) | Ordering policy should be allowed to reorder an application when demand changes |  Major | capacityscheduler | Craig Welch | Craig Welch |
| [YARN-3686](https://issues.apache.org/jira/browse/YARN-3686) | CapacityScheduler should trim default\_node\_label\_expression |  Critical | api, client, resourcemanager | Wangda Tan | Sunil G |
| [YARN-3647](https://issues.apache.org/jira/browse/YARN-3647) | RMWebServices api's should use updated api from CommonNodeLabelsManager to get NodeLabel object |  Major | resourcemanager | Sunil G | Sunil G |
| [YARN-3581](https://issues.apache.org/jira/browse/YARN-3581) | Deprecate -directlyAccessNodeLabelStore in RMAdminCLI |  Major | api, client, resourcemanager | Wangda Tan | Naganarasimha G R |
| [HDFS-8482](https://issues.apache.org/jira/browse/HDFS-8482) | Rename BlockInfoContiguous to BlockInfo |  Major | . | Zhe Zhang | Zhe Zhang |
| [YARN-3700](https://issues.apache.org/jira/browse/YARN-3700) | ATS Web Performance issue at load time when large number of jobs |  Major | resourcemanager, webapp, yarn | Xuan Gong | Xuan Gong |
| [YARN-3716](https://issues.apache.org/jira/browse/YARN-3716) | Node-label-expression should be included by ResourceRequestPBImpl.toString |  Minor | api | Xianyin Xin | Xianyin Xin |
| [YARN-3740](https://issues.apache.org/jira/browse/YARN-3740) | Fixed the typo with the configuration name: APPLICATION\_HISTORY\_PREFIX\_MAX\_APPS |  Major | resourcemanager, webapp, yarn | Xuan Gong | Xuan Gong |
| [YARN-2900](https://issues.apache.org/jira/browse/YARN-2900) | Application (Attempt and Container) Not Found in AHS results in Internal Server Error (500) |  Major | timelineserver | Jonathan Eagles | Mit Desai |
| [HDFS-8489](https://issues.apache.org/jira/browse/HDFS-8489) | Subclass BlockInfo to represent contiguous blocks |  Major | namenode | Zhe Zhang | Zhe Zhang |
| [YARN-2392](https://issues.apache.org/jira/browse/YARN-2392) | add more diags about app retry limits on AM failures |  Minor | resourcemanager | Steve Loughran | Steve Loughran |
| [YARN-3766](https://issues.apache.org/jira/browse/YARN-3766) | ATS Web UI breaks because of YARN-3467 |  Blocker | resourcemanager, webapp, yarn | Xuan Gong | Xuan Gong |
| [YARN-1462](https://issues.apache.org/jira/browse/YARN-1462) | AHS API and other AHS changes to handle tags for completed MR jobs |  Major | . | Karthik Kambatla | Xuan Gong |
| [YARN-3787](https://issues.apache.org/jira/browse/YARN-3787) | loading applications by filtering appstartedTime period for ATS Web UI |  Major | resourcemanager, webapp, yarn | Xuan Gong | Xuan Gong |
| [HDFS-7923](https://issues.apache.org/jira/browse/HDFS-7923) | The DataNodes should rate-limit their full block reports by asking the NN on heartbeat messages |  Major | . | Colin P. McCabe | Colin P. McCabe |
| [HDFS-8540](https://issues.apache.org/jira/browse/HDFS-8540) | Mover should exit with NO\_MOVE\_BLOCK if no block can be moved |  Major | balancer & mover | Tsz Wo Nicholas Sze | Surendra Singh Lilhore |
| [YARN-3711](https://issues.apache.org/jira/browse/YARN-3711) | Documentation of ResourceManager HA should explain configurations about listen addresses |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-8597](https://issues.apache.org/jira/browse/HDFS-8597) | Fix TestFSImage#testZeroBlockSize on Windows |  Major | datanode, test | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-7164](https://issues.apache.org/jira/browse/HDFS-7164) | Feature documentation for HDFS-6581 |  Major | documentation | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8238](https://issues.apache.org/jira/browse/HDFS-8238) | Move ClientProtocol to the hdfs-client |  Major | build | Haohui Mai | Takanobu Asanuma |
| [HDFS-6249](https://issues.apache.org/jira/browse/HDFS-6249) | Output AclEntry in PBImageXmlWriter |  Minor | tools | Akira Ajisaka | Surendra Singh Lilhore |
| [YARN-3521](https://issues.apache.org/jira/browse/YARN-3521) | Support return structured NodeLabel objects in REST API |  Major | api, client, resourcemanager | Wangda Tan | Sunil G |
| [HDFS-8192](https://issues.apache.org/jira/browse/HDFS-8192) | Eviction should key off used locked memory instead of ram disk free space |  Major | datanode | Arpit Agarwal | Arpit Agarwal |
| [HDFS-8651](https://issues.apache.org/jira/browse/HDFS-8651) | Make hadoop-hdfs-project Native code -Wall-clean |  Major | native | Alan Burlison | Alan Burlison |
| [HADOOP-12036](https://issues.apache.org/jira/browse/HADOOP-12036) | Consolidate all of the cmake extensions in one directory |  Major | . | Allen Wittenauer | Alan Burlison |
| [HDFS-7390](https://issues.apache.org/jira/browse/HDFS-7390) | Provide JMX metrics per storage type |  Major | . | Benoy Antony | Benoy Antony |
| [HADOOP-12104](https://issues.apache.org/jira/browse/HADOOP-12104) | Migrate Hadoop Pipes native build to new CMake framework |  Major | build | Alan Burlison | Alan Burlison |
| [HADOOP-12112](https://issues.apache.org/jira/browse/HADOOP-12112) | Make hadoop-common-project Native code -Wall-clean |  Major | native | Alan Burlison | Alan Burlison |
| [HDFS-8493](https://issues.apache.org/jira/browse/HDFS-8493) | Consolidate truncate() related implementation in a single class |  Major | . | Haohui Mai | Rakesh R |
| [HDFS-8635](https://issues.apache.org/jira/browse/HDFS-8635) | Migrate HDFS native build to new CMake framework |  Major | build | Alan Burlison | Alan Burlison |
| [YARN-3827](https://issues.apache.org/jira/browse/YARN-3827) | Migrate YARN native build to new CMake framework |  Major | build | Alan Burlison | Alan Burlison |
| [MAPREDUCE-6376](https://issues.apache.org/jira/browse/MAPREDUCE-6376) | Add avro binary support for jhist files |  Major | jobhistoryserver | Ray Chiang | Ray Chiang |
| [HDFS-8620](https://issues.apache.org/jira/browse/HDFS-8620) | Clean up the checkstyle warinings about ClientProtocol |  Major | . | Takanobu Asanuma | Takanobu Asanuma |
| [HDFS-8726](https://issues.apache.org/jira/browse/HDFS-8726) | Move protobuf files that define the client-sever protocols to hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [YARN-1012](https://issues.apache.org/jira/browse/YARN-1012) | Report NM aggregated container resource utilization in heartbeat |  Major | nodemanager | Arun C Murthy | Inigo Goiri |
| [YARN-3800](https://issues.apache.org/jira/browse/YARN-3800) | Reduce storage footprint for ReservationAllocation |  Major | capacityscheduler, fairscheduler, resourcemanager | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-3445](https://issues.apache.org/jira/browse/YARN-3445) | Cache runningApps in RMNode for getting running apps on given NodeId |  Major | nodemanager, resourcemanager | Junping Du | Junping Du |
| [YARN-3116](https://issues.apache.org/jira/browse/YARN-3116) | [Collector wireup] We need an assured way to determine if a container is an AM container on NM |  Major | nodemanager, timelineserver | Zhijie Shen | Giovanni Matteo Fumarola |
| [HDFS-8541](https://issues.apache.org/jira/browse/HDFS-8541) | Mover should exit with NO\_MOVE\_PROGRESS if there is no move progress |  Minor | balancer & mover | Tsz Wo Nicholas Sze | Surendra Singh Lilhore |
| [HDFS-8742](https://issues.apache.org/jira/browse/HDFS-8742) | Inotify: Support event for OP\_TRUNCATE |  Major | namenode | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [YARN-1449](https://issues.apache.org/jira/browse/YARN-1449) | AM-NM protocol changes to support container resizing |  Major | api | Wangda Tan (No longer used) | MENG DING |
| [HADOOP-11974](https://issues.apache.org/jira/browse/HADOOP-11974) | Fix FIONREAD #include on Solaris |  Minor | net | Alan Burlison | Alan Burlison |
| [YARN-3930](https://issues.apache.org/jira/browse/YARN-3930) | FileSystemNodeLabelsStore should make sure edit log file closed when exception is thrown |  Major | api, client, resourcemanager | Dian Fu | Dian Fu |
| [YARN-3844](https://issues.apache.org/jira/browse/YARN-3844) | Make hadoop-yarn-project Native code -Wall-clean |  Major | build | Alan Burlison | Alan Burlison |
| [HDFS-8794](https://issues.apache.org/jira/browse/HDFS-8794) | Improve CorruptReplicasMap#corruptReplicasMap |  Major | . | Yi Liu | Yi Liu |
| [HDFS-7483](https://issues.apache.org/jira/browse/HDFS-7483) | Display information per tier on the Namenode UI |  Major | . | Benoy Antony | Benoy Antony |
| [YARN-2003](https://issues.apache.org/jira/browse/YARN-2003) | Support for Application priority : Changes in RM and Capacity Scheduler |  Major | resourcemanager | Sunil G | Sunil G |
| [HDFS-8721](https://issues.apache.org/jira/browse/HDFS-8721) | Add a metric for number of encryption zones |  Major | encryption | Rakesh R | Rakesh R |
| [YARN-1645](https://issues.apache.org/jira/browse/YARN-1645) | ContainerManager implementation to support container resizing |  Major | nodemanager | Wangda Tan | MENG DING |
| [HDFS-8495](https://issues.apache.org/jira/browse/HDFS-8495) | Consolidate append() related implementation into a single class |  Major | namenode | Rakesh R | Rakesh R |
| [HDFS-8795](https://issues.apache.org/jira/browse/HDFS-8795) | Improve InvalidateBlocks#node2blocks |  Major | . | Yi Liu | Yi Liu |
| [HADOOP-12184](https://issues.apache.org/jira/browse/HADOOP-12184) | Remove unused Linux-specific constants in NativeIO |  Major | native | Martin Walsh | Martin Walsh |
| [HDFS-8730](https://issues.apache.org/jira/browse/HDFS-8730) | Clean up the import statements in ClientProtocol |  Minor | . | Takanobu Asanuma | Takanobu Asanuma |
| [YARN-3969](https://issues.apache.org/jira/browse/YARN-3969) | Allow jobs to be submitted to reservation that is active but does not have any allocations |  Major | capacityscheduler, fairscheduler, resourcemanager | Subru Krishnan | Subru Krishnan |
| [HADOOP-12170](https://issues.apache.org/jira/browse/HADOOP-12170) | hadoop-common's JNIFlags.cmake is redundant and can be removed |  Minor | native | Alan Burlison | Alan Burlison |
| [YARN-3656](https://issues.apache.org/jira/browse/YARN-3656) | LowCost: A Cost-Based Placement Agent for YARN Reservations |  Major | capacityscheduler, resourcemanager | Ishai Menache | Jonathan Yaniv |
| [YARN-3852](https://issues.apache.org/jira/browse/YARN-3852) | Add docker container support to container-executor |  Major | yarn | Sidharta Seethana | Abin Shahab |
| [YARN-3853](https://issues.apache.org/jira/browse/YARN-3853) | Add docker container runtime support to LinuxContainterExecutor |  Major | yarn | Sidharta Seethana | Sidharta Seethana |
| [YARN-3867](https://issues.apache.org/jira/browse/YARN-3867) | ContainerImpl changes to support container resizing |  Major | nodemanager | MENG DING | MENG DING |
| [HDFS-7192](https://issues.apache.org/jira/browse/HDFS-7192) | DN should ignore lazyPersist hint if the writer is not local |  Major | datanode | Arpit Agarwal | Arpit Agarwal |
| [YARN-433](https://issues.apache.org/jira/browse/YARN-433) | When RM is catching up with node updates then it should not expire acquired containers |  Major | resourcemanager | Bikas Saha | Xuan Gong |
| [MAPREDUCE-6394](https://issues.apache.org/jira/browse/MAPREDUCE-6394) | Speed up Task processing loop in HsTasksBlock#render() |  Major | jobhistoryserver | Ray Chiang | Ray Chiang |
| [HADOOP-7824](https://issues.apache.org/jira/browse/HADOOP-7824) | NativeIO.java flags and identifiers must be set correctly for each platform, not hardcoded to their Linux values |  Major | native | Dmytro Shteflyuk | Martin Walsh |
| [YARN-3543](https://issues.apache.org/jira/browse/YARN-3543) | ApplicationReport should be able to tell whether the Application is AM managed or not. |  Major | api | Spandan Dutta | Rohith Sharma K S |
| [YARN-4004](https://issues.apache.org/jira/browse/YARN-4004) | container-executor should print output of docker logs if the docker container exits with non-0 exit status |  Major | nodemanager | Varun Vasudev | Varun Vasudev |
| [YARN-3736](https://issues.apache.org/jira/browse/YARN-3736) | Add RMStateStore apis to store and load accepted reservations for failover |  Major | capacityscheduler, fairscheduler, resourcemanager | Subru Krishnan | Anubhav Dhoot |
| [YARN-1643](https://issues.apache.org/jira/browse/YARN-1643) | Make ContainersMonitor can support change monitoring size of an allocated container in NM side |  Major | nodemanager | Wangda Tan | MENG DING |
| [YARN-3974](https://issues.apache.org/jira/browse/YARN-3974) | Refactor the reservation system test cases to use parameterized base test |  Major | capacityscheduler, fairscheduler | Subru Krishnan | Subru Krishnan |
| [YARN-3948](https://issues.apache.org/jira/browse/YARN-3948) | Display Application Priority in RM Web UI |  Major | webapp | Sunil G | Sunil G |
| [YARN-3873](https://issues.apache.org/jira/browse/YARN-3873) | pendingApplications in LeafQueue should also use OrderingPolicy |  Major | capacityscheduler | Sunil G | Sunil G |
| [YARN-3887](https://issues.apache.org/jira/browse/YARN-3887) | Support for changing Application priority during runtime |  Major | capacityscheduler, resourcemanager | Sunil G | Sunil G |
| [HDFS-8805](https://issues.apache.org/jira/browse/HDFS-8805) | Archival Storage: getStoragePolicy should not need superuser privilege |  Major | balancer & mover, namenode | Hui Zheng | Brahma Reddy Battula |
| [HDFS-8052](https://issues.apache.org/jira/browse/HDFS-8052) | Move WebHdfsFileSystem into hadoop-hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [YARN-4023](https://issues.apache.org/jira/browse/YARN-4023) | Publish Application Priority to TimelineServer |  Major | timelineserver | Sunil G | Sunil G |
| [HDFS-8824](https://issues.apache.org/jira/browse/HDFS-8824) | Do not use small blocks for balancing the cluster |  Major | balancer & mover | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [YARN-3534](https://issues.apache.org/jira/browse/YARN-3534) | Collect memory/cpu usage on the node |  Major | nodemanager, resourcemanager | Inigo Goiri | Inigo Goiri |
| [HDFS-8801](https://issues.apache.org/jira/browse/HDFS-8801) | Convert BlockInfoUnderConstruction as a feature |  Major | namenode | Zhe Zhang | Jing Zhao |
| [HDFS-8792](https://issues.apache.org/jira/browse/HDFS-8792) | BlockManager#postponedMisreplicatedBlocks should use a LightWeightHashSet to save memory |  Major | . | Yi Liu | Yi Liu |
| [HDFS-8862](https://issues.apache.org/jira/browse/HDFS-8862) | BlockManager#excessReplicateMap should use a HashMap |  Major | namenode | Yi Liu | Yi Liu |
| [HDFS-8278](https://issues.apache.org/jira/browse/HDFS-8278) | HDFS Balancer should consider remaining storage % when checking for under-utilized machines |  Major | balancer & mover | Gopal V | Tsz Wo Nicholas Sze |
| [HDFS-8826](https://issues.apache.org/jira/browse/HDFS-8826) | Balancer may not move blocks efficiently in some cases |  Major | balancer & mover | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-8803](https://issues.apache.org/jira/browse/HDFS-8803) | Move DfsClientConf to hdfs-client |  Major | build | Haohui Mai | Mingliang Liu |
| [YARN-2923](https://issues.apache.org/jira/browse/YARN-2923) | Support configuration based NodeLabelsProvider Service in Distributed Node Label Configuration Setup |  Major | nodemanager | Naganarasimha G R | Naganarasimha G R |
| [YARN-1644](https://issues.apache.org/jira/browse/YARN-1644) | RM-NM protocol changes and NodeStatusUpdater implementation to support container resizing |  Major | nodemanager | Wangda Tan | MENG DING |
| [YARN-3868](https://issues.apache.org/jira/browse/YARN-3868) | ContainerManager recovery for container resizing |  Major | nodemanager | MENG DING | MENG DING |
| [HDFS-8823](https://issues.apache.org/jira/browse/HDFS-8823) | Move replication factor into individual blocks |  Major | . | Haohui Mai | Haohui Mai |
| [YARN-221](https://issues.apache.org/jira/browse/YARN-221) | NM should provide a way for AM to tell it not to aggregate logs. |  Major | log-aggregation, nodemanager | Robert Joseph Evans | Ming Ma |
| [HDFS-8934](https://issues.apache.org/jira/browse/HDFS-8934) | Move ShortCircuitShm to hdfs-client |  Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-8948](https://issues.apache.org/jira/browse/HDFS-8948) | Use GenericTestUtils to set log levels in TestPread and TestReplaceDatanodeOnFailure |  Major | build | Mingliang Liu | Mingliang Liu |
| [YARN-4014](https://issues.apache.org/jira/browse/YARN-4014) | Support user cli interface in for Application Priority |  Major | client, resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-8951](https://issues.apache.org/jira/browse/HDFS-8951) | Move the shortcircuit package to hdfs-client |  Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-8248](https://issues.apache.org/jira/browse/HDFS-8248) | Store INodeId instead of the INodeFile object in BlockInfoContiguous |  Major | . | Haohui Mai | Haohui Mai |
| [HDFS-8962](https://issues.apache.org/jira/browse/HDFS-8962) | Clean up checkstyle warnings in o.a.h.hdfs.DfsClientConf |  Major | build | Mingliang Liu | Mingliang Liu |
| [YARN-3250](https://issues.apache.org/jira/browse/YARN-3250) | Support admin cli interface in for Application Priority |  Major | resourcemanager | Sunil G | Rohith Sharma K S |
| [HDFS-8925](https://issues.apache.org/jira/browse/HDFS-8925) | Move BlockReaderLocal to hdfs-client |  Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-8980](https://issues.apache.org/jira/browse/HDFS-8980) | Remove unnecessary block replacement in INodeFile |  Major | namenode | Jing Zhao | Jing Zhao |
| [HDFS-8990](https://issues.apache.org/jira/browse/HDFS-8990) | Move RemoteBlockReader to hdfs-client module |  Major | build | Mingliang Liu | Mingliang Liu |
| [YARN-4092](https://issues.apache.org/jira/browse/YARN-4092) | RM HA UI redirection needs to be fixed when both RMs are in standby mode |  Major | resourcemanager | Xuan Gong | Xuan Gong |
| [YARN-4082](https://issues.apache.org/jira/browse/YARN-4082) | Container shouldn't be killed when node's label updated. |  Major | capacity scheduler | Wangda Tan | Wangda Tan |
| [YARN-2801](https://issues.apache.org/jira/browse/YARN-2801) | Add documentation for node labels feature |  Major | documentation | Gururaj Shetty | Wangda Tan |
| [YARN-3893](https://issues.apache.org/jira/browse/YARN-3893) | Both RM in active state when Admin#transitionToActive failure from refeshAll() |  Critical | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-8890](https://issues.apache.org/jira/browse/HDFS-8890) | Allow admin to specify which blockpools the balancer should run on |  Major | balancer & mover | Chris Trezzo | Chris Trezzo |
| [YARN-4101](https://issues.apache.org/jira/browse/YARN-4101) | RM should print alert messages if Zookeeper and Resourcemanager gets connection issue |  Critical | yarn | Yesha Vora | Xuan Gong |
| [YARN-3970](https://issues.apache.org/jira/browse/YARN-3970) | REST api support for Application Priority |  Major | webapp | Sunil G | Naganarasimha G R |
| [HDFS-9002](https://issues.apache.org/jira/browse/HDFS-9002) | Move o.a.h.hdfs.net/\*Peer classes to hdfs-client |  Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-9012](https://issues.apache.org/jira/browse/HDFS-9012) | Move o.a.h.hdfs.protocol.datatransfer.PipelineAck class to hadoop-hdfs-client module |  Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-8984](https://issues.apache.org/jira/browse/HDFS-8984) | Move replication queues related methods in FSNamesystem to BlockManager |  Major | . | Haohui Mai | Haohui Mai |
| [YARN-2884](https://issues.apache.org/jira/browse/YARN-2884) | Proxying all AM-RM communications |  Major | nodemanager, resourcemanager | Carlo Curino | Kishore Chaliparambil |
| [YARN-4136](https://issues.apache.org/jira/browse/YARN-4136) | LinuxContainerExecutor loses info when forwarding ResourceHandlerException |  Trivial | nodemanager | Steve Loughran | Bibin A Chundatt |
| [HDFS-9041](https://issues.apache.org/jira/browse/HDFS-9041) | Move entries in META-INF/services/o.a.h.fs.FileSystem to hdfs-client |  Major | build | Haohui Mai | Mingliang Liu |
| [HDFS-9010](https://issues.apache.org/jira/browse/HDFS-9010) | Replace NameNode.DEFAULT\_PORT with HdfsClientConfigKeys.DFS\_NAMENODE\_RPC\_PORT\_DEFAULT config key |  Major | build | Mingliang Liu | Mingliang Liu |
| [YARN-1651](https://issues.apache.org/jira/browse/YARN-1651) | CapacityScheduler side changes to support increase/decrease container resource. |  Major | resourcemanager, scheduler | Wangda Tan | Wangda Tan |
| [YARN-313](https://issues.apache.org/jira/browse/YARN-313) | Add Admin API for supporting node resource configuration in command line |  Critical | client, graceful | Junping Du | Inigo Goiri |
| [HDFS-9008](https://issues.apache.org/jira/browse/HDFS-9008) | Balancer#Parameters class could use a builder pattern |  Minor | balancer & mover | Chris Trezzo | Chris Trezzo |
| [YARN-3635](https://issues.apache.org/jira/browse/YARN-3635) | Get-queue-mapping should be a common interface of YarnScheduler |  Major | scheduler | Wangda Tan | Tan, Wangda |
| [YARN-3717](https://issues.apache.org/jira/browse/YARN-3717) | Expose app/am/queue's node-label-expression to RM web UI / CLI / REST-API |  Major | . | Naganarasimha G R | Naganarasimha G R |
| [HDFS-7986](https://issues.apache.org/jira/browse/HDFS-7986) | Allow files / directories to be deleted from the NameNode UI |  Major | ui | Ravi Prakash | Ravi Prakash |
| [HDFS-7995](https://issues.apache.org/jira/browse/HDFS-7995) | Implement chmod in the HDFS Web UI |  Major | ui | Ravi Prakash | Ravi Prakash |
| [YARN-4034](https://issues.apache.org/jira/browse/YARN-4034) | Render cluster Max Priority in scheduler metrics in RM web UI |  Minor | resourcemanager, webapp | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-9022](https://issues.apache.org/jira/browse/HDFS-9022) | Move NameNode.getAddress() and NameNode.getUri() to hadoop-hdfs-client |  Major | hdfs-client | Mingliang Liu | Mingliang Liu |
| [YARN-4171](https://issues.apache.org/jira/browse/YARN-4171) | Resolve findbugs/javac warnings in YARN-1197 branch |  Major | api, nodemanager, resourcemanager | Wangda Tan | Wangda Tan |
| [YARN-3212](https://issues.apache.org/jira/browse/YARN-3212) | RMNode State Transition Update with DECOMMISSIONING state |  Major | graceful, resourcemanager | Junping Du | Junping Du |
| [HDFS-9101](https://issues.apache.org/jira/browse/HDFS-9101) | Remove deprecated NameNode.getUri() static helper method |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-9004](https://issues.apache.org/jira/browse/HDFS-9004) | Add upgrade domain to DatanodeInfo |  Major | . | Ming Ma | Ming Ma |
| [HDFS-9111](https://issues.apache.org/jira/browse/HDFS-9111) | Move hdfs-client protobuf convert methods from PBHelper to PBHelperClient |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-9039](https://issues.apache.org/jira/browse/HDFS-9039) | Separate client and server side methods of o.a.h.hdfs.NameNodeProxies |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-8733](https://issues.apache.org/jira/browse/HDFS-8733) | Keep server related definition in hdfs.proto on server side |  Major | . | Yi Liu | Mingliang Liu |
| [HDFS-9131](https://issues.apache.org/jira/browse/HDFS-9131) | Move config keys used by hdfs-client to HdfsClientConfigKeys |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-7529](https://issues.apache.org/jira/browse/HDFS-7529) | Consolidate encryption zone related implementation into a single class |  Major | . | Haohui Mai | Rakesh R |
| [HDFS-9134](https://issues.apache.org/jira/browse/HDFS-9134) | Move LEASE\_{SOFTLIMIT,HARDLIMIT}\_PERIOD constants from HdfsServerConstants to HdfsConstants |  Major | . | Mingliang Liu | Mingliang Liu |
| [HADOOP-11918](https://issues.apache.org/jira/browse/HADOOP-11918) | Listing an empty s3a root directory throws FileNotFound. |  Minor | fs/s3 | Lei (Eddy) Xu | Lei (Eddy) Xu |
| [HDFS-8053](https://issues.apache.org/jira/browse/HDFS-8053) | Move DFSIn/OutputStream and related classes to hadoop-hdfs-client |  Major | build | Haohui Mai | Mingliang Liu |
| [HDFS-8740](https://issues.apache.org/jira/browse/HDFS-8740) | Move DistributedFileSystem to hadoop-hdfs-client |  Major | build | Yi Liu | Mingliang Liu |
| [YARN-4141](https://issues.apache.org/jira/browse/YARN-4141) | Runtime Application Priority change should not throw exception for applications at finishing states |  Major | resourcemanager | Sunil G | Sunil G |
| [HDFS-9165](https://issues.apache.org/jira/browse/HDFS-9165) | Move entries in META-INF/services/o.a.h.fs.FileSystem to hdfs-client |  Major | build | Haohui Mai | Mingliang Liu |
| [HDFS-9166](https://issues.apache.org/jira/browse/HDFS-9166) | Move hftp / hsftp filesystem to hfds-client |  Major | build | Haohui Mai | Mingliang Liu |
| [HDFS-8971](https://issues.apache.org/jira/browse/HDFS-8971) | Remove guards when calling LOG.debug() and LOG.trace() in client package |  Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-9015](https://issues.apache.org/jira/browse/HDFS-9015) | Refactor TestReplicationPolicy to test different block placement policies |  Major | . | Ming Ma | Ming Ma |
| [YARN-1897](https://issues.apache.org/jira/browse/YARN-1897) | CLI and core support for signal container functionality |  Major | api | Ming Ma | Ming Ma |
| [HDFS-9158](https://issues.apache.org/jira/browse/HDFS-9158) | [OEV-Doc] : Document does not mention about "-f" and "-r" options |  Major | . | nijel | nijel |
| [HDFS-9155](https://issues.apache.org/jira/browse/HDFS-9155) | OEV should treat .XML files as XML even when the file name extension is uppercase |  Major | . | nijel | nijel |
| [YARN-4215](https://issues.apache.org/jira/browse/YARN-4215) | RMNodeLabels Manager Need to verify and replace node labels for the only modified Node Label Mappings in the request |  Major | resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9170](https://issues.apache.org/jira/browse/HDFS-9170) | Move libhdfs / fuse-dfs / libwebhdfs to hdfs-client |  Major | . | Haohui Mai | Haohui Mai |
| [HDFS-9159](https://issues.apache.org/jira/browse/HDFS-9159) | [OIV] : return value of the command is not correct if invalid value specified in "-p (processor)" option |  Major | . | nijel | nijel |
| [YARN-4140](https://issues.apache.org/jira/browse/YARN-4140) | RM container allocation delayed incase of app submitted to Nodelabel partition |  Major | scheduler | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-3964](https://issues.apache.org/jira/browse/YARN-3964) | Support NodeLabelsProvider at Resource Manager side |  Major | . | Dian Fu | Dian Fu |
| [YARN-4230](https://issues.apache.org/jira/browse/YARN-4230) | Increasing container resource while there is no headroom left will cause ResourceManager to crash |  Critical | resourcemanager | MENG DING | MENG DING |
| [HDFS-9006](https://issues.apache.org/jira/browse/HDFS-9006) | Provide BlockPlacementPolicy that supports upgrade domain |  Major | . | Ming Ma | Ming Ma |
| [HDFS-9160](https://issues.apache.org/jira/browse/HDFS-9160) | [OIV-Doc] : Missing details of "delimited" for processor options |  Major | . | nijel | nijel |
| [HDFS-9167](https://issues.apache.org/jira/browse/HDFS-9167) | Update pom.xml in other modules to depend on hdfs-client instead of hdfs |  Major | build | Haohui Mai | Mingliang Liu |
| [YARN-4255](https://issues.apache.org/jira/browse/YARN-4255) | container-executor does not clean up docker operation command files. |  Minor | . | Sidharta Seethana | Sidharta Seethana |
| [HDFS-9223](https://issues.apache.org/jira/browse/HDFS-9223) | Code cleanup for DatanodeDescriptor and HeartbeatManager |  Minor | namenode | Jing Zhao | Jing Zhao |
| [YARN-4258](https://issues.apache.org/jira/browse/YARN-4258) | Add support for controlling capabilities for docker containers |  Major | yarn | Sidharta Seethana | Sidharta Seethana |
| [HDFS-9157](https://issues.apache.org/jira/browse/HDFS-9157) | [OEV and OIV] : Unnecessary parsing for mandatory arguements if "-h" option is specified as the only option |  Major | . | nijel | nijel |
| [HADOOP-12475](https://issues.apache.org/jira/browse/HADOOP-12475) | Replace guava Cache with ConcurrentHashMap for caching Connection in ipc Client |  Major | conf, io, ipc | Walter Su | Walter Su |
| [YARN-4162](https://issues.apache.org/jira/browse/YARN-4162) | CapacityScheduler: Add resource usage by partition and queue capacity by partition to REST API |  Major | api, client, resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [YARN-4170](https://issues.apache.org/jira/browse/YARN-4170) | AM need to be notified with priority in AllocateResponse |  Major | resourcemanager | Sunil G | Sunil G |
| [YARN-2556](https://issues.apache.org/jira/browse/YARN-2556) | Tool to measure the performance of the timeline server |  Major | timelineserver | Jonathan Eagles | Chang Li |
| [YARN-4262](https://issues.apache.org/jira/browse/YARN-4262) | Allow whitelisted users to run privileged docker containers. |  Major | yarn | Sidharta Seethana | Sidharta Seethana |
| [YARN-4267](https://issues.apache.org/jira/browse/YARN-4267) | Add additional logging to container launch implementations in container-executor |  Major | yarn | Sidharta Seethana | Sidharta Seethana |
| [YARN-3985](https://issues.apache.org/jira/browse/YARN-3985) | Make ReservationSystem persist state using RMStateStore reservation APIs |  Major | resourcemanager | Anubhav Dhoot | Anubhav Dhoot |
| [YARN-2513](https://issues.apache.org/jira/browse/YARN-2513) | Host framework UIs in YARN for use with the ATS |  Major | timelineserver | Jonathan Eagles | Jonathan Eagles |
| [YARN-3739](https://issues.apache.org/jira/browse/YARN-3739) | Add reservation system recovery to RM recovery process |  Major | capacityscheduler, fairscheduler, resourcemanager | Subru Krishnan | Subru Krishnan |
| [YARN-4243](https://issues.apache.org/jira/browse/YARN-4243) | Add retry on establishing Zookeeper conenction in EmbeddedElectorService#serviceInit |  Major | resourcemanager | Xuan Gong | Xuan Gong |
| [YARN-3738](https://issues.apache.org/jira/browse/YARN-3738) | Add support for recovery of reserved apps running under dynamic queues |  Major | capacityscheduler, resourcemanager | Subru Krishnan | Subru Krishnan |
| [YARN-3724](https://issues.apache.org/jira/browse/YARN-3724) | Use POSIX nftw(3) instead of fts(3) |  Major | . | Malcolm Kavalsky | Alan Burlison |
| [YARN-2729](https://issues.apache.org/jira/browse/YARN-2729) | Support script based NodeLabelsProvider Interface in Distributed Node Label Configuration Setup |  Major | nodemanager | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9304](https://issues.apache.org/jira/browse/HDFS-9304) | Add HdfsClientConfigKeys class to TestHdfsConfigFields#configurationClasses |  Major | build | Mingliang Liu | Mingliang Liu |
| [YARN-3216](https://issues.apache.org/jira/browse/YARN-3216) | Max-AM-Resource-Percentage should respect node labels |  Critical | resourcemanager | Wangda Tan | Sunil G |
| [HADOOP-12457](https://issues.apache.org/jira/browse/HADOOP-12457) | [JDK8] Fix a failure of compiling common by javadoc |  Major | . | Tsuyoshi Ozawa | Akira Ajisaka |
| [HDFS-9168](https://issues.apache.org/jira/browse/HDFS-9168) | Move client side unit test to hadoop-hdfs-client |  Major | build | Haohui Mai | Haohui Mai |
| [HDFS-9343](https://issues.apache.org/jira/browse/HDFS-9343) | Empty caller context considered invalid |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-9362](https://issues.apache.org/jira/browse/HDFS-9362) | TestAuditLogger#testAuditLoggerWithCallContext assumes Unix line endings, fails on Windows. |  Minor | test | Chris Nauroth | Chris Nauroth |
| [HDFS-9007](https://issues.apache.org/jira/browse/HDFS-9007) | Fix HDFS Balancer to honor upgrade domain policy |  Major | . | Ming Ma | Ming Ma |
| [HDFS-9379](https://issues.apache.org/jira/browse/HDFS-9379) | Make NNThroughputBenchmark$BlockReportStats support more than 10 datanodes |  Major | test | Mingliang Liu | Mingliang Liu |
| [YARN-1510](https://issues.apache.org/jira/browse/YARN-1510) | Make NMClient support change container resources |  Major | nodemanager | Wangda Tan (No longer used) | MENG DING |
| [YARN-4345](https://issues.apache.org/jira/browse/YARN-4345) | yarn rmadmin -updateNodeResource doesn't work |  Critical | graceful, resourcemanager | Sushmitha Sreenivasan | Junping Du |
| [YARN-1509](https://issues.apache.org/jira/browse/YARN-1509) | Make AMRMClient support send increase container request and get increased/decreased containers |  Major | resourcemanager | Wangda Tan (No longer used) | MENG DING |
| [HDFS-9387](https://issues.apache.org/jira/browse/HDFS-9387) | Fix namenodeUri parameter parsing in NNThroughputBenchmark |  Major | test | Mingliang Liu | Mingliang Liu |
| [HDFS-9421](https://issues.apache.org/jira/browse/HDFS-9421) | NNThroughputBenchmark replication test NPE with -namenode option |  Major | benchmarks | Xiaoyu Yao | Mingliang Liu |
| [YARN-4184](https://issues.apache.org/jira/browse/YARN-4184) | Remove update reservation state api from state store as its not used by ReservationSystem |  Major | capacityscheduler, fairscheduler, resourcemanager | Anubhav Dhoot | Sean Po |
| [HADOOP-12582](https://issues.apache.org/jira/browse/HADOOP-12582) | Using BytesWritable's getLength() and getBytes() instead of get() and getSize() |  Major | . | Tsuyoshi Ozawa | Akira Ajisaka |
| [YARN-3454](https://issues.apache.org/jira/browse/YARN-3454) | Add efficient merge operation to RLESparseResourceAllocation |  Major | resourcemanager | Carlo Curino | Carlo Curino |
| [HDFS-7796](https://issues.apache.org/jira/browse/HDFS-7796) | Include X-editable for slick contenteditable fields in the web UI |  Major | ui | Ravi Prakash | Ravi Prakash |
| [YARN-3980](https://issues.apache.org/jira/browse/YARN-3980) | Plumb resource-utilization info in node heartbeat through to the scheduler |  Major | resourcemanager, scheduler | Karthik Kambatla | Inigo Goiri |
| [HADOOP-11954](https://issues.apache.org/jira/browse/HADOOP-11954) | Solaris does not support RLIMIT\_MEMLOCK as in Linux |  Major | . | Malcolm Kavalsky | Alan Burlison |
| [YARN-4384](https://issues.apache.org/jira/browse/YARN-4384) | updateNodeResource CLI should not accept negative values for resource |  Major | graceful, resourcemanager | Sushmitha Sreenivasan | Junping Du |
| [HDFS-9438](https://issues.apache.org/jira/browse/HDFS-9438) | TestPipelinesFailover assumes Linux ifconfig |  Minor | test | Alan Burlison | John Zhuge |
| [YARN-4292](https://issues.apache.org/jira/browse/YARN-4292) | ResourceUtilization should be a part of NodeInfo REST API |  Major | . | Wangda Tan | Sunil G |
| [HDFS-9436](https://issues.apache.org/jira/browse/HDFS-9436) | Make NNThroughputBenchmark$BlockReportStats run with 10 datanodes by default |  Minor | test | Mingliang Liu | Mingliang Liu |
| [HDFS-9484](https://issues.apache.org/jira/browse/HDFS-9484) | NNThroughputBenchmark$BlockReportStats should not send empty block reports |  Major | test | Mingliang Liu | Mingliang Liu |
| [YARN-4405](https://issues.apache.org/jira/browse/YARN-4405) | Support node label store in non-appendable file system |  Major | api, client, resourcemanager | Wangda Tan | Wangda Tan |
| [HDFS-9214](https://issues.apache.org/jira/browse/HDFS-9214) | Support reconfiguring dfs.datanode.balance.max.concurrent.moves without DN restart |  Major | datanode | Xiaobing Zhou | Xiaobing Zhou |
| [YARN-4248](https://issues.apache.org/jira/browse/YARN-4248) | REST API for submit/update/delete Reservations |  Major | resourcemanager | Carlo Curino | Carlo Curino |
| [YARN-4358](https://issues.apache.org/jira/browse/YARN-4358) | Improve relationship between SharingPolicy and ReservationAgent |  Major | capacityscheduler, fairscheduler, resourcemanager | Carlo Curino | Carlo Curino |
| [YARN-3946](https://issues.apache.org/jira/browse/YARN-3946) | Update exact reason as to why a submitted app is in ACCEPTED state to app's diagnostic message |  Major | capacity scheduler, resourcemanager | Sumit Nigam | Naganarasimha G R |
| [YARN-4309](https://issues.apache.org/jira/browse/YARN-4309) | Add container launch related debug information to container logs when a container fails |  Major | nodemanager | Varun Vasudev | Varun Vasudev |
| [YARN-4293](https://issues.apache.org/jira/browse/YARN-4293) | ResourceUtilization should be a part of yarn node CLI |  Major | . | Wangda Tan | Sunil G |
| [YARN-4416](https://issues.apache.org/jira/browse/YARN-4416) | Deadlock due to synchronised get Methods in AbstractCSQueue |  Minor | capacity scheduler, resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [YARN-3226](https://issues.apache.org/jira/browse/YARN-3226) | UI changes for decommissioning node |  Major | graceful | Junping Du | Sunil G |
| [YARN-4164](https://issues.apache.org/jira/browse/YARN-4164) | Retrospect update ApplicationPriority API return type |  Major | resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [YARN-4234](https://issues.apache.org/jira/browse/YARN-4234) | New put APIs in TimelineClient for ats v1.5 |  Major | timelineserver | Xuan Gong | Xuan Gong |
| [YARN-4098](https://issues.apache.org/jira/browse/YARN-4098) | Document ApplicationPriority feature |  Major | resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-7779](https://issues.apache.org/jira/browse/HDFS-7779) | Support changing ownership, group and replication in HDFS Web UI |  Major | ui | Ravi Prakash | Ravi Prakash |
| [YARN-2902](https://issues.apache.org/jira/browse/YARN-2902) | Killing a container that is localizing can orphan resources in the DOWNLOADING state |  Major | nodemanager | Jason Lowe | Varun Saxena |
| [YARN-4393](https://issues.apache.org/jira/browse/YARN-4393) | TestResourceLocalizationService#testFailedDirsResourceRelease fails intermittently |  Major | test | Varun Saxena | Varun Saxena |
| [YARN-4479](https://issues.apache.org/jira/browse/YARN-4479) | Retrospect app-priority in pendingOrderingPolicy during recovering applications |  Major | api, resourcemanager | Rohith Sharma K S | Rohith Sharma K S |
| [HDFS-9621](https://issues.apache.org/jira/browse/HDFS-9621) | getListing wrongly associates Erasure Coding policy to pre-existing replicated files under an EC directory |  Critical | erasure-coding | Sushmitha Sreenivasan | Jing Zhao |
| [YARN-4537](https://issues.apache.org/jira/browse/YARN-4537) | Pull out priority comparison from fifocomparator and use compound comparator for FifoOrdering policy |  Major | capacity scheduler | Rohith Sharma K S | Rohith Sharma K S |
| [HADOOP-11262](https://issues.apache.org/jira/browse/HADOOP-11262) | Enable YARN to use S3A |  Major | fs/s3 | Thomas Demoor | Pieter Reuse |
| [YARN-4265](https://issues.apache.org/jira/browse/YARN-4265) | Provide new timeline plugin storage to support fine-grained entity caching |  Major | timelineserver | Li Lu | Li Lu |
| [YARN-4304](https://issues.apache.org/jira/browse/YARN-4304) | AM max resource configuration per partition to be displayed/updated correctly in UI and in various partition related metrics |  Major | webapp | Sunil G | Sunil G |
| [YARN-4557](https://issues.apache.org/jira/browse/YARN-4557) | Fix improper Queues sorting in PartitionedQueueComparator when accessible-node-labels=\* |  Major | resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9601](https://issues.apache.org/jira/browse/HDFS-9601) | NNThroughputBenchmark.BlockReportStats should handle NotReplicatedYetException on adding block |  Major | test | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-4614](https://issues.apache.org/jira/browse/YARN-4614) | TestApplicationPriority#testApplicationPriorityAllocationWithChangeInPriority fails occasionally |  Major | test | Jason Lowe | Sunil G |
| [HDFS-9672](https://issues.apache.org/jira/browse/HDFS-9672) | o.a.h.hdfs.TestLeaseRecovery2 fails intermittently |  Major | test | Mingliang Liu | Mingliang Liu |
| [YARN-4573](https://issues.apache.org/jira/browse/YARN-4573) | TestRMAppTransitions.testAppRunningKill and testAppKilledKilled fail on trunk |  Major | resourcemanager, test | Takashi Ohnishi | Takashi Ohnishi |
| [YARN-4643](https://issues.apache.org/jira/browse/YARN-4643) | Container recovery is broken with delegating container runtime |  Critical | yarn | Sidharta Seethana | Sidharta Seethana |
| [YARN-4219](https://issues.apache.org/jira/browse/YARN-4219) | New levelDB cache storage for timeline v1.5 |  Major | . | Li Lu | Li Lu |
| [YARN-4543](https://issues.apache.org/jira/browse/YARN-4543) | TestNodeStatusUpdater.testStopReentrant fails + JUnit misusage |  Minor | nodemanager | Akihiro Suda | Akihiro Suda |
| [YARN-4340](https://issues.apache.org/jira/browse/YARN-4340) | Add "list" API to reservation system |  Major | capacityscheduler, fairscheduler, resourcemanager | Carlo Curino | Sean Po |
| [YARN-4100](https://issues.apache.org/jira/browse/YARN-4100) | Add Documentation for Distributed and Delegated-Centralized Node Labels feature |  Major | api, client, resourcemanager | Naganarasimha G R | Naganarasimha G R |
| [HDFS-9503](https://issues.apache.org/jira/browse/HDFS-9503) | Replace -namenode option with -fs for NNThroughputBenchmark |  Major | test | Konstantin Shvachko | Mingliang Liu |
| [HADOOP-12292](https://issues.apache.org/jira/browse/HADOOP-12292) | Make use of DeleteObjects optional |  Major | fs/s3 | Thomas Demoor | Thomas Demoor |
| [YARN-4667](https://issues.apache.org/jira/browse/YARN-4667) | RM Admin CLI for refreshNodesResources throws NPE when nothing is configured |  Critical | client | Naganarasimha G R | Naganarasimha G R |
| [HADOOP-12752](https://issues.apache.org/jira/browse/HADOOP-12752) | Improve diagnostics/use of envvar/sysprop credential propagation |  Minor | security | Steve Loughran | Steve Loughran |
| [YARN-4138](https://issues.apache.org/jira/browse/YARN-4138) | Roll back container resource allocation after resource increase token expires |  Major | api, nodemanager, resourcemanager | MENG DING | MENG DING |
| [YARN-2575](https://issues.apache.org/jira/browse/YARN-2575) | Create separate ACLs for Reservation create/update/delete/list ops |  Major | capacityscheduler, fairscheduler, resourcemanager | Subru Krishnan | Sean Po |
| [HADOOP-11613](https://issues.apache.org/jira/browse/HADOOP-11613) | Remove commons-httpclient dependency from hadoop-azure |  Major | . | Akira Ajisaka | Masatake Iwasaki |
| [HDFS-9084](https://issues.apache.org/jira/browse/HDFS-9084) | Pagination, sorting and filtering of files/directories in the HDFS Web UI |  Major | ui | Ravi Prakash | Ravi Prakash |
| [YARN-3223](https://issues.apache.org/jira/browse/YARN-3223) | Resource update during NM graceful decommission |  Major | graceful, nodemanager, resourcemanager | Junping Du | Brook Zhou |
| [YARN-4680](https://issues.apache.org/jira/browse/YARN-4680) | TimerTasks leak in ATS V1.5 Writer |  Major | timelineserver | Xuan Gong | Xuan Gong |
| [HADOOP-12711](https://issues.apache.org/jira/browse/HADOOP-12711) | Remove dependency on commons-httpclient for ServletUtil |  Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-4566](https://issues.apache.org/jira/browse/YARN-4566) | TestMiniYarnClusterNodeUtilization sometimes fails on trunk |  Major | test | Takashi Ohnishi | Takashi Ohnishi |
| [HADOOP-12813](https://issues.apache.org/jira/browse/HADOOP-12813) | Migrate TestRPC and related codes to rebase on ProtobufRpcEngine |  Major | . | Kai Zheng | Kai Zheng |
| [YARN-4749](https://issues.apache.org/jira/browse/YARN-4749) | Generalize config file handling in container-executor |  Major | nodemanager | Sidharta Seethana | Sidharta Seethana |
| [YARN-4696](https://issues.apache.org/jira/browse/YARN-4696) | Improving EntityGroupFSTimelineStore on exception handling, test setup, and concurrency |  Major | timelineserver | Steve Loughran | Steve Loughran |
| [MAPREDUCE-6520](https://issues.apache.org/jira/browse/MAPREDUCE-6520) | Migrate MR Client test cases part 1 |  Trivial | test | Dustin Cote | Dustin Cote |
| [YARN-4545](https://issues.apache.org/jira/browse/YARN-4545) | Allow YARN distributed shell to use ATS v1.5 APIs |  Major | timelineserver | Li Lu | Li Lu |
| [YARN-4817](https://issues.apache.org/jira/browse/YARN-4817) | Change Log Level to DEBUG for putDomain call in ATS 1.5 |  Trivial | timelineserver | Xuan Gong | Xuan Gong |
| [YARN-4108](https://issues.apache.org/jira/browse/YARN-4108) | CapacityScheduler: Improve preemption to only kill containers that would satisfy the incoming request |  Major | capacity scheduler | Wangda Tan | Wangda Tan |
| [HADOOP-12819](https://issues.apache.org/jira/browse/HADOOP-12819) | Migrate TestSaslRPC and related codes to rebase on ProtobufRpcEngine |  Major | . | Kai Zheng | Kai Zheng |
| [YARN-4815](https://issues.apache.org/jira/browse/YARN-4815) | ATS 1.5 timelineclient impl try to create attempt directory for every event call |  Major | timelineserver | Xuan Gong | Xuan Gong |
| [YARN-4814](https://issues.apache.org/jira/browse/YARN-4814) | ATS 1.5 timelineclient impl call flush after every event write |  Major | timelineserver | Xuan Gong | Xuan Gong |
| [YARN-998](https://issues.apache.org/jira/browse/YARN-998) | Keep NM resource updated through dynamic resource config for RM/NM restart |  Major | graceful, nodemanager, scheduler | Junping Du | Junping Du |
| [MAPREDUCE-6543](https://issues.apache.org/jira/browse/MAPREDUCE-6543) | Migrate MR Client test cases part 2 |  Trivial | test | Dustin Cote | Dustin Cote |
| [YARN-4822](https://issues.apache.org/jira/browse/YARN-4822) | Refactor existing Preemption Policy of CS for easier adding new approach to select preemption candidates |  Major | . | Wangda Tan | Wangda Tan |
| [YARN-4634](https://issues.apache.org/jira/browse/YARN-4634) | Scheduler UI/Metrics need to consider cases like non-queue label mappings |  Major | . | Sunil G | Sunil G |
| [HADOOP-12169](https://issues.apache.org/jira/browse/HADOOP-12169) | ListStatus on empty dir in S3A lists itself instead of returning an empty list |  Major | fs/s3 | Pieter Reuse | Pieter Reuse |
| [HDFS-10186](https://issues.apache.org/jira/browse/HDFS-10186) | DirectoryScanner: Improve logs by adding full path of both actual and expected block directories |  Minor | datanode | Rakesh R | Rakesh R |
| [YARN-4826](https://issues.apache.org/jira/browse/YARN-4826) | Document configuration of ReservationSystem for CapacityScheduler |  Minor | capacity scheduler | Subru Krishnan | Subru Krishnan |
| [HADOOP-12444](https://issues.apache.org/jira/browse/HADOOP-12444) | Support lazy seek in S3AInputStream |  Major | fs/s3 | Rajesh Balamohan | Rajesh Balamohan |
| [YARN-4928](https://issues.apache.org/jira/browse/YARN-4928) | Some yarn.server.timeline.\* tests fail on Windows attempting to use a test root path containing a colon |  Minor | test | Gergely Novák | Gergely Novák |
| [YARN-4168](https://issues.apache.org/jira/browse/YARN-4168) | Test TestLogAggregationService.testLocalFileDeletionOnDiskFull failing |  Critical | test | Steve Loughran | Takashi Ohnishi |
| [HADOOP-12973](https://issues.apache.org/jira/browse/HADOOP-12973) | make DU pluggable |  Major | . | Elliott Clark | Elliott Clark |
| [YARN-4886](https://issues.apache.org/jira/browse/YARN-4886) | Add HDFS caller context for EntityGroupFSTimelineStore |  Major | timelineserver | Li Lu | Li Lu |
| [HDFS-10281](https://issues.apache.org/jira/browse/HDFS-10281) | o.a.h.hdfs.server.namenode.ha.TestPendingCorruptDnMessages fails intermittently |  Major | test | Mingliang Liu | Mingliang Liu |
| [YARN-4909](https://issues.apache.org/jira/browse/YARN-4909) | Fix intermittent failures of TestRMWebServices And TestRMWithCSRFFilter |  Blocker | . | Brahma Reddy Battula | Bibin A Chundatt |
| [YARN-4468](https://issues.apache.org/jira/browse/YARN-4468) | Document the general ReservationSystem functionality, and the REST API |  Major | capacityscheduler, fairscheduler, resourcemanager | Carlo Curino | Carlo Curino |
| [HADOOP-13011](https://issues.apache.org/jira/browse/HADOOP-13011) | Clearly Document the Password Details for Keystore-based Credential Providers |  Major | documentation | Larry McCay | Larry McCay |
| [YARN-3215](https://issues.apache.org/jira/browse/YARN-3215) | Respect labels in CapacityScheduler when computing headroom |  Major | capacityscheduler | Wangda Tan | Naganarasimha G R |
| [HDFS-10224](https://issues.apache.org/jira/browse/HDFS-10224) | Implement asynchronous rename for DistributedFileSystem |  Major | fs, hdfs-client | Xiaobing Zhou | Xiaobing Zhou |
| [YARN-4956](https://issues.apache.org/jira/browse/YARN-4956) | findbug issue on LevelDBCacheTimelineStore |  Major | timelineserver | Xuan Gong | Zhiyuan Yang |
| [YARN-4851](https://issues.apache.org/jira/browse/YARN-4851) | Metric improvements for ATS v1.5 storage components |  Major | timelineserver | Li Lu | Li Lu |
| [HADOOP-12749](https://issues.apache.org/jira/browse/HADOOP-12749) | Create a threadpoolexecutor that overrides afterExecute to log uncaught exceptions/errors |  Major | . | Sidharta Seethana | Sidharta Seethana |
| [HDFS-10346](https://issues.apache.org/jira/browse/HDFS-10346) | Implement asynchronous setPermission/setOwner for DistributedFileSystem |  Major | hdfs, hdfs-client | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-13122](https://issues.apache.org/jira/browse/HADOOP-13122) | Customize User-Agent header sent in HTTP requests by S3A. |  Minor | fs/s3 | Chris Nauroth | Chris Nauroth |
| [HADOOP-12844](https://issues.apache.org/jira/browse/HADOOP-12844) | Recover when S3A fails on IOException in read() |  Major | fs/s3 | Pieter Reuse | Pieter Reuse |
| [HADOOP-13028](https://issues.apache.org/jira/browse/HADOOP-13028) | add low level counter metrics for S3A; use in read performance tests |  Major | fs/s3, metrics | Steve Loughran | Steve Loughran |
| [HADOOP-13113](https://issues.apache.org/jira/browse/HADOOP-13113) | Enable parallel test execution for hadoop-aws. |  Minor | test | Chris Nauroth | Chris Nauroth |
| [HADOOP-13158](https://issues.apache.org/jira/browse/HADOOP-13158) | S3AFileSystem#toString might throw NullPointerException due to null cannedACL. |  Minor | fs/s3 | Chris Nauroth | Chris Nauroth |
| [YARN-4832](https://issues.apache.org/jira/browse/YARN-4832) | NM side resource value should get updated if change applied in RM side |  Critical | nodemanager, resourcemanager | Junping Du | Junping Du |
| [HADOOP-13140](https://issues.apache.org/jira/browse/HADOOP-13140) | FileSystem#initialize must not attempt to create StorageStatistics objects with null or empty schemes |  Major | fs | Brahma Reddy Battula | Mingliang Liu |
| [HADOOP-13130](https://issues.apache.org/jira/browse/HADOOP-13130) | s3a failures can surface as RTEs, not IOEs |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-3362](https://issues.apache.org/jira/browse/YARN-3362) | Add node label usage in RM CapacityScheduler web UI |  Major | capacityscheduler, resourcemanager, webapp | Wangda Tan | Naganarasimha G R |
| [HDFS-10390](https://issues.apache.org/jira/browse/HDFS-10390) | Implement asynchronous setAcl/getAclStatus for DistributedFileSystem |  Major | fs | Xiaobing Zhou | Xiaobing Zhou |
| [YARN-857](https://issues.apache.org/jira/browse/YARN-857) | Localization failures should be available in container diagnostics |  Critical | . | Hitesh Shah | Vinod Kumar Vavilapalli |
| [HDFS-8057](https://issues.apache.org/jira/browse/HDFS-8057) | Move BlockReader implementation to the client implementation package |  Major | hdfs-client | Tsz Wo Nicholas Sze | Takanobu Asanuma |
| [YARN-4957](https://issues.apache.org/jira/browse/YARN-4957) | Add getNewReservation in ApplicationClientProtocol |  Major | applications, client, resourcemanager | Subru Krishnan | Sean Po |
| [HDFS-10431](https://issues.apache.org/jira/browse/HDFS-10431) | Refactor and speedup TestAsyncDFSRename |  Minor | test | Xiaobing Zhou | Xiaobing Zhou |
| [YARN-4987](https://issues.apache.org/jira/browse/YARN-4987) | Read cache concurrency issue between read and evict in EntityGroupFS timeline store |  Critical | . | Li Lu | Li Lu |
| [HDFS-10430](https://issues.apache.org/jira/browse/HDFS-10430) | Reuse FileSystem#access in TestAsyncDFS |  Major | hdfs | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-13162](https://issues.apache.org/jira/browse/HADOOP-13162) | Consider reducing number of getFileStatus calls in S3AFileSystem.mkdirs |  Minor | fs/s3 | Rajesh Balamohan | Rajesh Balamohan |
| [HADOOP-13131](https://issues.apache.org/jira/browse/HADOOP-13131) | Add tests to verify that S3A supports SSE-S3 encryption |  Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13171](https://issues.apache.org/jira/browse/HADOOP-13171) | Add StorageStatistics to S3A; instrument some more operations |  Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-1815](https://issues.apache.org/jira/browse/YARN-1815) | Work preserving recovery of Unmanged AMs |  Critical | resourcemanager | Karthik Kambatla | Subru Krishnan |
| [YARN-5165](https://issues.apache.org/jira/browse/YARN-5165) | Fix NoOvercommitPolicy to take advantage of RLE representation of plan |  Major | capacityscheduler, fairscheduler, resourcemanager | Carlo Curino | Carlo Curino |
| [YARN-5185](https://issues.apache.org/jira/browse/YARN-5185) | StageAllocaterGreedyRLE: Fix NPE in corner case |  Major | capacityscheduler, fairscheduler, resourcemanager | Carlo Curino | Carlo Curino |
| [YARN-4525](https://issues.apache.org/jira/browse/YARN-4525) | Fix bug in RLESparseResourceAllocation.getRangeOverlapping(...) |  Major | . | Ishai Menache | Ishai Menache |
| [HADOOP-13237](https://issues.apache.org/jira/browse/HADOOP-13237) | s3a initialization against public bucket fails if caller lacks any credentials |  Minor | fs/s3 | Steve Loughran | Chris Nauroth |
| [YARN-5199](https://issues.apache.org/jira/browse/YARN-5199) | Close LogReader in in AHSWebServices#getStreamingOutput and FileInputStream in NMWebServices#getLogs |  Major | . | Xuan Gong | Xuan Gong |
| [YARN-3426](https://issues.apache.org/jira/browse/YARN-3426) | Add jdiff support to YARN |  Blocker | . | Li Lu | Li Lu |
| [YARN-1942](https://issues.apache.org/jira/browse/YARN-1942) | Deprecate toString/fromString methods from ConverterUtils and move them to records classes like ContainerId/ApplicationId, etc. |  Critical | api | Thomas Graves | Wangda Tan |
| [HADOOP-13241](https://issues.apache.org/jira/browse/HADOOP-13241) | document s3a better |  Minor | documentation, fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13284](https://issues.apache.org/jira/browse/HADOOP-13284) | FileSystemStorageStatistics must not attempt to read non-existent rack-aware read stats in branch-2.8 |  Major | fs | Mingliang Liu | Mingliang Liu |
| [HADOOP-12975](https://issues.apache.org/jira/browse/HADOOP-12975) | Add jitter to CachingGetSpaceUsed's thread |  Major | . | Elliott Clark | Elliott Clark |
| [HADOOP-13280](https://issues.apache.org/jira/browse/HADOOP-13280) | FileSystemStorageStatistics#getLong(“readOps“) should return readOps + largeReadOps |  Major | fs | Mingliang Liu | Mingliang Liu |
| [HADOOP-13288](https://issues.apache.org/jira/browse/HADOOP-13288) | Guard null stats key in FileSystemStorageStatistics |  Major | fs | Mingliang Liu | Mingliang Liu |
| [HADOOP-13291](https://issues.apache.org/jira/browse/HADOOP-13291) | Probing stats in DFSOpsCountStatistics/S3AStorageStatistics should be correctly implemented |  Major | fs | Mingliang Liu | Mingliang Liu |
| [HDFS-10538](https://issues.apache.org/jira/browse/HDFS-10538) | Remove AsyncDistributedFileSystem API |  Major | hdfs-client | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-13203](https://issues.apache.org/jira/browse/HADOOP-13203) | S3A: Support fadvise "random" mode for high performance readPositioned() reads |  Major | fs/s3 | Rajesh Balamohan | Rajesh Balamohan |
| [HADOOP-12229](https://issues.apache.org/jira/browse/HADOOP-12229) | Fix inconsistent subsection titles in filesystem.md |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-12242](https://issues.apache.org/jira/browse/HADOOP-12242) | Add in-page TOC to filesystem specification pages |  Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-13305](https://issues.apache.org/jira/browse/HADOOP-13305) | Define common statistics names across schemes |  Major | fs | Mingliang Liu | Mingliang Liu |
| [HADOOP-13283](https://issues.apache.org/jira/browse/HADOOP-13283) | Support reset operation for new global storage statistics and per FS storage stats |  Major | fs | Mingliang Liu | Mingliang Liu |
| [YARN-5080](https://issues.apache.org/jira/browse/YARN-5080) | Cannot obtain logs using YARN CLI -am for either KILLED or RUNNING AM |  Critical | yarn | Sumana Sathish | Xuan Gong |
| [HADOOP-13366](https://issues.apache.org/jira/browse/HADOOP-13366) | Fix dead link in o.a.h.fs.CommonConfigurationKeysPublic javadoc |  Minor | documentation | Rakesh R | Rakesh R |
| [YARN-4484](https://issues.apache.org/jira/browse/YARN-4484) | Available Resource calculation for a queue is not correct when used with labels |  Major | capacity scheduler | Sunil G | Sunil G |
| [HADOOP-13368](https://issues.apache.org/jira/browse/HADOOP-13368) | DFSOpsCountStatistics$OpType#fromSymbol and s3a.Statistic#fromSymbol should be O(1) operation |  Major | fs | Mingliang Liu | Mingliang Liu |
| [HADOOP-13212](https://issues.apache.org/jira/browse/HADOOP-13212) | Provide an option to set the socket buffers in S3AFileSystem |  Minor | fs/s3 | Rajesh Balamohan | Rajesh Balamohan |
| [HDFS-10653](https://issues.apache.org/jira/browse/HDFS-10653) | Optimize conversion from path string to components |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13207](https://issues.apache.org/jira/browse/HADOOP-13207) | Specify FileSystem listStatus, listFiles and RemoteIterator |  Major | documentation, fs | Steve Loughran | Steve Loughran |
| [HADOOP-13188](https://issues.apache.org/jira/browse/HADOOP-13188) | S3A file-create should throw error rather than overwrite directories |  Minor | fs/s3 | Raymie Stata | Steve Loughran |
| [HDFS-10642](https://issues.apache.org/jira/browse/HDFS-10642) | TestLazyPersistReplicaRecovery#testDnRestartWithSavedReplicas fails intermittently |  Major | datanode, test | Mingliang Liu | Mingliang Liu |
| [HDFS-10668](https://issues.apache.org/jira/browse/HDFS-10668) | TestDataNodeMXBean#testDataNodeMXBeanBlockCount fails intermittently |  Major | test | Mingliang Liu | Mingliang Liu |
| [YARN-5434](https://issues.apache.org/jira/browse/YARN-5434) | Add -client\|server argument for graceful decom |  Blocker | graceful | Robert Kanter | Robert Kanter |
| [HADOOP-13429](https://issues.apache.org/jira/browse/HADOOP-13429) | Dispose of unnecessary SASL servers |  Major | ipc | Daryn Sharp | Daryn Sharp |
| [HADOOP-13426](https://issues.apache.org/jira/browse/HADOOP-13426) | More efficiently build IPC responses |  Major | . | Daryn Sharp | Daryn Sharp |
| [HDFS-10656](https://issues.apache.org/jira/browse/HDFS-10656) | Optimize conversion of byte arrays back to path string |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10674](https://issues.apache.org/jira/browse/HDFS-10674) | Optimize creating a full path from an inode |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [YARN-5342](https://issues.apache.org/jira/browse/YARN-5342) | Improve non-exclusive node partition resource allocation in Capacity Scheduler |  Major | . | Wangda Tan | Sunil G |
| [HADOOP-13438](https://issues.apache.org/jira/browse/HADOOP-13438) | Optimize IPC server protobuf decoding |  Major | . | Daryn Sharp | Daryn Sharp |
| [HADOOP-13418](https://issues.apache.org/jira/browse/HADOOP-13418) | Fix javadoc warnings by JDK8 in hadoop-nfs package |  Major | . | Kai Sasaki | Kai Sasaki |
| [HDFS-10724](https://issues.apache.org/jira/browse/HDFS-10724) | Document the caller context config keys |  Minor | ipc, namenode | Mingliang Liu | Mingliang Liu |
| [HDFS-10678](https://issues.apache.org/jira/browse/HDFS-10678) | Documenting NNThroughputBenchmark tool |  Major | benchmarks, test | Mingliang Liu | Mingliang Liu |
| [HDFS-10641](https://issues.apache.org/jira/browse/HDFS-10641) | TestBlockManager#testBlockReportQueueing fails intermittently |  Major | namenode, test | Mingliang Liu | Daryn Sharp |
| [HADOOP-13324](https://issues.apache.org/jira/browse/HADOOP-13324) | s3a tests don't authenticate with S3 frankfurt (or other V4 auth only endpoints) |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13208](https://issues.apache.org/jira/browse/HADOOP-13208) | S3A listFiles(recursive=true) to do a bulk listObjects instead of walking the pseudo-tree of directories |  Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13405](https://issues.apache.org/jira/browse/HADOOP-13405) | doc for “fs.s3a.acl.default” indicates incorrect values |  Minor | fs/s3 | Shen Yinjie | Shen Yinjie |
| [HDFS-10711](https://issues.apache.org/jira/browse/HDFS-10711) | Optimize FSPermissionChecker group membership check |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13252](https://issues.apache.org/jira/browse/HADOOP-13252) | Tune S3A provider plugin mechanism |  Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13446](https://issues.apache.org/jira/browse/HADOOP-13446) | Support running isolated unit tests separate from AWS integration tests. |  Major | fs/s3 | Chris Nauroth | Chris Nauroth |
| [HDFS-10762](https://issues.apache.org/jira/browse/HDFS-10762) | Pass IIP for file status related methods |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10772](https://issues.apache.org/jira/browse/HDFS-10772) | Reduce byte/string conversions for get listing |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [YARN-3940](https://issues.apache.org/jira/browse/YARN-3940) | Application moveToQueue should check NodeLabel permission |  Major | resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-10768](https://issues.apache.org/jira/browse/HDFS-10768) | Optimize mkdir ops |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10655](https://issues.apache.org/jira/browse/HDFS-10655) | Fix path related byte array conversion bugs |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10662](https://issues.apache.org/jira/browse/HDFS-10662) | Optimize UTF8 string/byte conversions |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13547](https://issues.apache.org/jira/browse/HADOOP-13547) | Optimize IPC client protobuf decoding |  Major | . | Daryn Sharp | Daryn Sharp |
| [HADOOP-13549](https://issues.apache.org/jira/browse/HADOOP-13549) | Eliminate intermediate buffer for server-side PB encoding |  Major | ipc | Daryn Sharp | Daryn Sharp |
| [HADOOP-13447](https://issues.apache.org/jira/browse/HADOOP-13447) | Refactor S3AFileSystem to support introduction of separate metadata repository and tests. |  Major | fs/s3 | Chris Nauroth | Chris Nauroth |
| [HADOOP-13541](https://issues.apache.org/jira/browse/HADOOP-13541) | explicitly declare the Joda time version S3A depends on |  Minor | build, fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-5566](https://issues.apache.org/jira/browse/YARN-5566) | Client-side NM graceful decom is not triggered when jobs finish |  Major | nodemanager | Robert Kanter | Robert Kanter |
| [HADOOP-10940](https://issues.apache.org/jira/browse/HADOOP-10940) | RPC client does no bounds checking of responses |  Critical | ipc | Daryn Sharp | Daryn Sharp |
| [HADOOP-13540](https://issues.apache.org/jira/browse/HADOOP-13540) | improve section on troubleshooting s3a auth problems |  Minor | documentation, fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-8818](https://issues.apache.org/jira/browse/HDFS-8818) | Allow Balancer to run faster |  Major | balancer & mover | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze |
| [HDFS-10673](https://issues.apache.org/jira/browse/HDFS-10673) | Optimize FSPermissionChecker's internal path usage |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13546](https://issues.apache.org/jira/browse/HADOOP-13546) | Override equals and hashCode to avoid connection leakage |  Major | ipc | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-10744](https://issues.apache.org/jira/browse/HDFS-10744) | Internally optimize path component resolution |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10805](https://issues.apache.org/jira/browse/HDFS-10805) | Reduce runtime for append test |  Minor | test | Gergely Novák | Gergely Novák |
| [HADOOP-13544](https://issues.apache.org/jira/browse/HADOOP-13544) | JDiff reports unncessarily show unannotated APIs and cause confusion while our javadocs only show annotated and public APIs |  Blocker | . | Vinod Kumar Vavilapalli | Vinod Kumar Vavilapalli |
| [HDFS-10779](https://issues.apache.org/jira/browse/HDFS-10779) | Rename does not need to re-solve destination |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10892](https://issues.apache.org/jira/browse/HDFS-10892) | Add unit tests for HDFS command 'dfs -tail' and 'dfs -stat' |  Major | fs, shell, test | Mingliang Liu | Mingliang Liu |
| [HADOOP-13599](https://issues.apache.org/jira/browse/HADOOP-13599) | s3a close() to be non-synchronized, so avoid risk of deadlock on shutdown |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-12974](https://issues.apache.org/jira/browse/HADOOP-12974) | Create a CachingGetSpaceUsed implementation that uses df |  Major | . | Elliott Clark | Elliott Clark |
| [HDFS-10851](https://issues.apache.org/jira/browse/HDFS-10851) | FSDirStatAndListingOp: stop passing path as string |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10619](https://issues.apache.org/jira/browse/HDFS-10619) | Cache path in InodesInPath |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10934](https://issues.apache.org/jira/browse/HDFS-10934) | TestDFSShell.testStat fails intermittently |  Major | test | Eric Badger | Eric Badger |
| [HADOOP-13674](https://issues.apache.org/jira/browse/HADOOP-13674) | S3A can provide a more detailed error message when accessing a bucket through an incorrect S3 endpoint. |  Minor | fs/s3 | Chris Nauroth | Chris Nauroth |
| [HDFS-10956](https://issues.apache.org/jira/browse/HDFS-10956) | Remove rename/delete performance penalty when not using snapshots |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10896](https://issues.apache.org/jira/browse/HDFS-10896) | Move lock logging logic from FSNamesystem into FSNamesystemLock |  Major | namenode | Erik Krogen | Erik Krogen |
| [HDFS-10745](https://issues.apache.org/jira/browse/HDFS-10745) | Directly resolve paths into INodesInPath |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10955](https://issues.apache.org/jira/browse/HDFS-10955) | Pass IIP for FSDirAttr methods |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-12977](https://issues.apache.org/jira/browse/HADOOP-12977) | s3a to handle delete("/", true) robustly |  Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-10939](https://issues.apache.org/jira/browse/HDFS-10939) | Reduce performance penalty of encryption zones |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HADOOP-13692](https://issues.apache.org/jira/browse/HADOOP-13692) | hadoop-aws should declare explicit dependency on Jackson 2 jars to prevent classpath conflicts. |  Minor | fs/s3 | Chris Nauroth | Chris Nauroth |
| [HDFS-10979](https://issues.apache.org/jira/browse/HDFS-10979) | Pass IIP for FSDirDeleteOp methods |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10980](https://issues.apache.org/jira/browse/HDFS-10980) | Optimize check for existence of parent directory |  Major | hdfs | Daryn Sharp | Daryn Sharp |
| [HDFS-10988](https://issues.apache.org/jira/browse/HDFS-10988) | Refactor TestBalancerBandwidth |  Major | balancer & mover, test | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-10985](https://issues.apache.org/jira/browse/HDFS-10985) | o.a.h.ha.TestZKFailoverController should not use fixed time sleep before assertions |  Minor | ha, test | Mingliang Liu | Mingliang Liu |
| [HDFS-10972](https://issues.apache.org/jira/browse/HDFS-10972) | Add unit test for HDFS command 'dfsadmin -getDatanodeInfo' |  Major | fs, shell, test | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-10965](https://issues.apache.org/jira/browse/HDFS-10965) | Add unit test for HDFS command 'dfsadmin -printTopology' |  Major | fs, shell, test | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-11008](https://issues.apache.org/jira/browse/HDFS-11008) | Change unit test for testing parsing "-source" parameter in Balancer CLI |  Major | test | Mingliang Liu | Mingliang Liu |
| [HADOOP-13419](https://issues.apache.org/jira/browse/HADOOP-13419) | Fix javadoc warnings by JDK8 in hadoop-common package |  Major | . | Kai Sasaki | Kai Sasaki |
| [HDFS-10922](https://issues.apache.org/jira/browse/HDFS-10922) | Adding additional unit tests for Trash (II) |  Major | test | Xiaoyu Yao | Weiwei Yang |
| [HDFS-10906](https://issues.apache.org/jira/browse/HDFS-10906) | Add unit tests for Trash with HDFS encryption zones |  Major | encryption | Xiaoyu Yao | Hanisha Koneru |
| [HADOOP-13735](https://issues.apache.org/jira/browse/HADOOP-13735) | ITestS3AFileContextStatistics.testStatistics() failing |  Minor | fs/s3 | Steve Loughran | Pieter Reuse |
| [HDFS-10998](https://issues.apache.org/jira/browse/HDFS-10998) | Add unit tests for HDFS command 'dfsadmin -fetchImage' in HA |  Major | test | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-13727](https://issues.apache.org/jira/browse/HADOOP-13727) | S3A: Reduce high number of connections to EC2 Instance Metadata Service caused by InstanceProfileCredentialsProvider. |  Minor | fs/s3 | Rajesh Balamohan | Chris Nauroth |
| [HADOOP-12774](https://issues.apache.org/jira/browse/HADOOP-12774) | s3a should use UGI.getCurrentUser.getShortname() for username |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13309](https://issues.apache.org/jira/browse/HADOOP-13309) | Document S3A known limitations in file ownership and permission model. |  Minor | fs/s3 | Chris Nauroth | Chris Nauroth |
| [HDFS-11011](https://issues.apache.org/jira/browse/HDFS-11011) | Add unit tests for HDFS command 'dfsadmin -set/clrSpaceQuota' |  Major | hdfs-client | Xiaobing Zhou | Xiaobing Zhou |
| [HADOOP-13614](https://issues.apache.org/jira/browse/HADOOP-13614) | Purge some superfluous/obsolete S3 FS tests that are slowing test runs down |  Minor | fs/s3, test | Steve Loughran | Steve Loughran |
| [HADOOP-10597](https://issues.apache.org/jira/browse/HADOOP-10597) | RPC Server signals backoff to clients when all request queues are full |  Major | . | Ming Ma | Ming Ma |
| [HADOOP-13680](https://issues.apache.org/jira/browse/HADOOP-13680) | fs.s3a.readahead.range to use getLongBytes |  Major | fs/s3 | Steve Loughran | Abhishek Modi |
| [HDFS-11030](https://issues.apache.org/jira/browse/HDFS-11030) | TestDataNodeVolumeFailure#testVolumeFailure is flaky (though passing) |  Major | datanode, test | Mingliang Liu | Mingliang Liu |
| [HDFS-10997](https://issues.apache.org/jira/browse/HDFS-10997) | Reduce number of path resolving methods |  Major | namenode | Daryn Sharp | Daryn Sharp |
| [HDFS-11065](https://issues.apache.org/jira/browse/HDFS-11065) | Add space quota tests for heterogenous storages |  Major | hdfs | Xiaobing Zhou | Xiaobing Zhou |
| [HDFS-11031](https://issues.apache.org/jira/browse/HDFS-11031) | Add additional unit test for DataNode startup behavior when volumes fail |  Major | datanode, test | Mingliang Liu | Mingliang Liu |
| [HADOOP-10300](https://issues.apache.org/jira/browse/HADOOP-10300) | Allowed deferred sending of call responses |  Major | ipc | Daryn Sharp | Daryn Sharp |
| [HDFS-11076](https://issues.apache.org/jira/browse/HDFS-11076) | Add unit test for extended Acls |  Major | test | Chen Liang | Chen Liang |
| [HDFS-11085](https://issues.apache.org/jira/browse/HDFS-11085) | Add unit test for NameNode failing to start when name dir is unwritable |  Major | namenode, test | Mingliang Liu | Xiaobing Zhou |
| [YARN-5802](https://issues.apache.org/jira/browse/YARN-5802) | updateApplicationPriority api in scheduler should ensure to re-insert app to correct ordering policy |  Critical | capacity scheduler | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-11083](https://issues.apache.org/jira/browse/HDFS-11083) | Add unit test for DFSAdmin -report command |  Major | shell, test | Mingliang Liu | Xiaobing Zhou |
| [YARN-4498](https://issues.apache.org/jira/browse/YARN-4498) | Application level node labels stats to be available in REST |  Major | api, client, resourcemanager | Bibin A Chundatt | Bibin A Chundatt |
| [HDFS-11122](https://issues.apache.org/jira/browse/HDFS-11122) | TestDFSAdmin#testReportCommand fails due to timed out |  Minor | test | Yiqun Lin | Yiqun Lin |
| [HDFS-10872](https://issues.apache.org/jira/browse/HDFS-10872) | Add MutableRate metrics for FSNamesystemLock operations |  Major | namenode | Erik Krogen | Erik Krogen |
| [HDFS-11105](https://issues.apache.org/jira/browse/HDFS-11105) | TestRBWBlockInvalidation#testRWRInvalidation fails intermittently |  Major | namenode, test | Yiqun Lin | Yiqun Lin |
| [HADOOP-13822](https://issues.apache.org/jira/browse/HADOOP-13822) | Use GlobalStorageStatistics.INSTANCE.reset() at FileSystem#clearStatistics() |  Major | fs | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-11601](https://issues.apache.org/jira/browse/HADOOP-11601) | Enhance FS spec & tests to mandate FileStatus.getBlocksize() \>0 for non-empty files |  Minor | fs, test | Steve Loughran | Steve Loughran |
| [HADOOP-13801](https://issues.apache.org/jira/browse/HADOOP-13801) | regression: ITestS3AMiniYarnCluster failing |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-12804](https://issues.apache.org/jira/browse/HADOOP-12804) | Read Proxy Password from Credential Providers in S3 FileSystem |  Minor | fs/s3 | Larry McCay | Larry McCay |
| [HADOOP-13823](https://issues.apache.org/jira/browse/HADOOP-13823) | s3a rename: fail if dest file exists |  Blocker | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13857](https://issues.apache.org/jira/browse/HADOOP-13857) | S3AUtils.translateException to map (wrapped) InterruptedExceptions to InterruptedIOEs |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13855](https://issues.apache.org/jira/browse/HADOOP-13855) | Fix a couple of the s3a statistic names to be consistent with the rest |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-13257](https://issues.apache.org/jira/browse/HADOOP-13257) | Improve Azure Data Lake contract tests. |  Major | fs/adl | Chris Nauroth | Vishwajeet Dusane |
| [YARN-4390](https://issues.apache.org/jira/browse/YARN-4390) | Do surgical preemption based on reserved container in CapacityScheduler |  Major | capacity scheduler | Eric Payne | Wangda Tan |
| [HDFS-8630](https://issues.apache.org/jira/browse/HDFS-8630) | WebHDFS : Support get/set/unset StoragePolicy |  Major | webhdfs | nijel | Surendra Singh Lilhore |
| [HADOOP-13871](https://issues.apache.org/jira/browse/HADOOP-13871) | ITestS3AInputStreamPerformance.testTimeToOpenAndReadWholeFileBlocks performance awful |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-2009](https://issues.apache.org/jira/browse/YARN-2009) | CapacityScheduler: Add intra-queue preemption for app priority support |  Major | capacityscheduler | Devaraj K | Sunil G |
| [YARN-4844](https://issues.apache.org/jira/browse/YARN-4844) | Add getMemorySize/getVirtualCoresSize to o.a.h.y.api.records.Resource |  Blocker | api | Wangda Tan | Wangda Tan |
| [YARN-4990](https://issues.apache.org/jira/browse/YARN-4990) | Re-direction of a particular log file within in a container in NM UI does not redirect properly to Log Server ( history ) on container completion |  Major | . | Hitesh Shah | Xuan Gong |
| [YARN-3866](https://issues.apache.org/jira/browse/YARN-3866) | AM-RM protocol changes to support container resizing |  Blocker | api | MENG DING | MENG DING |
| [HADOOP-13336](https://issues.apache.org/jira/browse/HADOOP-13336) | S3A to support per-bucket configuration |  Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-8377](https://issues.apache.org/jira/browse/HDFS-8377) | Support HTTP/2 in datanode |  Major | . | Duo Zhang | Duo Zhang |
| [HADOOP-14019](https://issues.apache.org/jira/browse/HADOOP-14019) | fix some typos in the s3a docs |  Minor | documentation, fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-14081](https://issues.apache.org/jira/browse/HADOOP-14081) | S3A: Consider avoiding array copy in S3ABlockOutputStream (ByteArrayBlock) |  Minor | fs/s3 | Rajesh Balamohan | Rajesh Balamohan |
| [YARN-6143](https://issues.apache.org/jira/browse/YARN-6143) | Fix incompatible issue caused by YARN-3583 |  Blocker | rolling upgrade | Wangda Tan | Sunil G |
| [HADOOP-14113](https://issues.apache.org/jira/browse/HADOOP-14113) | review ADL Docs |  Minor | documentation, fs/adl | Steve Loughran | Steve Loughran |
| [HADOOP-14138](https://issues.apache.org/jira/browse/HADOOP-14138) | Remove S3A ref from META-INF service discovery, rely on existing core-default entry |  Critical | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-14123](https://issues.apache.org/jira/browse/HADOOP-14123) | Remove misplaced ADL service provider config file for FileSystem |  Minor | fs/adl | John Zhuge | John Zhuge |
| [HADOOP-14153](https://issues.apache.org/jira/browse/HADOOP-14153) | ADL module has messed doc structure |  Major | fs/adl | Mingliang Liu | Mingliang Liu |
| [HADOOP-14173](https://issues.apache.org/jira/browse/HADOOP-14173) | Remove unused AdlConfKeys#ADL\_EVENTS\_TRACKING\_SOURCE |  Trivial | fs/adl | John Zhuge | John Zhuge |


### OTHER:

| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [YARN-3357](https://issues.apache.org/jira/browse/YARN-3357) | Move TestFifoScheduler to FIFO package |  Major | scheduler, test | Rohith Sharma K S | Rohith Sharma K S |
| [HADOOP-11814](https://issues.apache.org/jira/browse/HADOOP-11814) | Reformat hadoop-annotations, o.a.h.classification.tools |  Minor | . | Li Lu | Li Lu |
| [MAPREDUCE-6388](https://issues.apache.org/jira/browse/MAPREDUCE-6388) | Remove deprecation warnings from JobHistoryServer classes |  Minor | jobhistoryserver | Ray Chiang | Ray Chiang |
| [YARN-3026](https://issues.apache.org/jira/browse/YARN-3026) | Move application-specific container allocation logic from LeafQueue to FiCaSchedulerApp |  Major | capacityscheduler | Wangda Tan | Wangda Tan |
| [HDFS-8938](https://issues.apache.org/jira/browse/HDFS-8938) | Extract BlockToMarkCorrupt and ReplicationWork as standalone classes from BlockManager |  Major | . | Mingliang Liu | Mingliang Liu |
| [HDFS-9027](https://issues.apache.org/jira/browse/HDFS-9027) | Refactor o.a.h.hdfs.DataStreamer#isLazyPersist() method |  Major | . | Mingliang Liu | Mingliang Liu |
| [MAPREDUCE-6477](https://issues.apache.org/jira/browse/MAPREDUCE-6477) | Replace usage of deprecated NameNode.DEFAULT\_PORT in TestFileSystem |  Major | . | Mingliang Liu | Mingliang Liu |
| [MAPREDUCE-6483](https://issues.apache.org/jira/browse/MAPREDUCE-6483) | Replace deprecated method NameNode.getUri() with DFSUtilClient.getNNUri() in TestMRCredentials |  Major | test | Mingliang Liu | Mingliang Liu |
| [HDFS-9130](https://issues.apache.org/jira/browse/HDFS-9130) | Use GenericTestUtils#setLogLevel to the logging level |  Major | . | Mingliang Liu | Mingliang Liu |
| [HADOOP-12446](https://issues.apache.org/jira/browse/HADOOP-12446) | Undeprecate createNonRecursive() |  Major | . | Ted Yu | Ted Yu |
| [HDFS-8979](https://issues.apache.org/jira/browse/HDFS-8979) | Clean up checkstyle warnings in hadoop-hdfs-client module |  Major | . | Mingliang Liu | Mingliang Liu |
| [HADOOP-11791](https://issues.apache.org/jira/browse/HADOOP-11791) | Update src/site/markdown/releases to include old versions of Hadoop |  Major | build, documentation | Allen Wittenauer | Allen Wittenauer |
| [HADOOP-12514](https://issues.apache.org/jira/browse/HADOOP-12514) | Make static fields in GenericTestUtils for assertExceptionContains() package-private and final |  Minor | test | Mingliang Liu | Mingliang Liu |
| [HDFS-9377](https://issues.apache.org/jira/browse/HDFS-9377) | Fix findbugs warnings in FSDirSnapshotOp |  Major | namenode | Mingliang Liu | Mingliang Liu |
| [HADOOP-12567](https://issues.apache.org/jira/browse/HADOOP-12567) | NPE in SaslRpcServer |  Major | . | Sergey Shelukhin | Sergey Shelukhin |
| [YARN-4653](https://issues.apache.org/jira/browse/YARN-4653) | Document YARN security model from the perspective of Application Developers |  Major | site | Steve Loughran | Steve Loughran |
| [HDFS-10200](https://issues.apache.org/jira/browse/HDFS-10200) | Docs for WebHDFS still describe GETDELEGATIONTOKENS operation |  Trivial | documentation | Wellington Chevreuil | Wellington Chevreuil |
| [HDFS-9353](https://issues.apache.org/jira/browse/HDFS-9353) | Code and comment mismatch in  JavaKeyStoreProvider |  Trivial | . | nijel | Andras Bokor |
| [HDFS-10984](https://issues.apache.org/jira/browse/HDFS-10984) | Expose nntop output as metrics |  Major | namenode | Siddharth Wagle | Siddharth Wagle |
| [YARN-5704](https://issues.apache.org/jira/browse/YARN-5704) | Provide config knobs to control enabling/disabling new/work in progress features in container-executor |  Major | yarn | Sidharta Seethana | Sidharta Seethana |
| [HADOOP-14091](https://issues.apache.org/jira/browse/HADOOP-14091) | AbstractFileSystem implementaion for 'wasbs' scheme |  Major | fs/azure | Varada Hemeswari | Varada Hemeswari |
| [YARN-6274](https://issues.apache.org/jira/browse/YARN-6274) | Documentation refers to incorrect nodemanager health checker interval property |  Trivial | documentation | Charles Zhang | Weiwei Yang |


