hadoop/hadoop-mapreduce-project/CHANGES.txt

Hadoop MapReduce Change Log

Release 2.8.0 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

    MAPREDUCE-6284. Add Task Attempt State API to MapReduce Application
    Master REST API. (Ryu Kobayashi via ozawa)

    MAPREDUCE-6364. Add a "Kill" link to Task Attempts page. (Ryu Kobayashi
    via ozawa)

    MAPREDUCE-6304. Specifying node labels when submitting MR jobs.
    (Naganarasimha G R via wangda)

    MAPREDUCE-6415. Create a tool to combine aggregated logs into HAR files.
    (Robert Kanter via kasha)

  IMPROVEMENTS

    MAPREDUCE-6471. Document distcp incremental copy
    (Neelesh Srinivas Salian via harsh)

    MAPREDUCE-5045. UtilTest#isCygwin method appears to be unused
    (Neelesh Srinivas Salian via harsh)

    MAPREDUCE-6291. Correct mapred queue usage command.
    (Brahma Reddu Battula via harsh)

    MAPREDUCE-579. Streaming "slowmatch" documentation. (harsh)

    MAPREDUCE-6287. Deprecated methods in org.apache.hadoop.examples.Sort
    (Chao Zhang via harsh)

    MAPREDUCE-5190. Unnecessary condition test in RandomSampler.
    (Jingguo Yao via harsh)

    MAPREDUCE-6239. Consolidate TestJobConf classes in
    hadoop-mapreduce-client-jobclient and hadoop-mapreduce-client-core
    (Varun Saxena via harsh)

    MAPREDUCE-5807. Print usage by TeraSort job. (Rohith via harsh)

    MAPREDUCE-4653. TestRandomAlgorithm has an unused "import" statement.
    (Amir Sanjar via harsh)

    MAPREDUCE-6100. replace "mapreduce.job.credentials.binary" with
    MRJobConfig.MAPREDUCE_JOB_CREDENTIALS_BINARY for better readability.
    (Zhihai Xu via harsh)

    MAPREDUCE-6105. Inconsistent configuration in property
    mapreduce.reduce.shuffle.merge.percent. (Ray Chiang via harsh)

    MAPREDUCE-4414. Add main methods to JobConf and YarnConfiguration,
    for debug purposes. (Plamen Jeliazkov via harsh)

    MAPREDUCE-5755. MapTask.MapOutputBuffer#compare/swap should have
    @Override annotation. (ozawa)

    MAPREDUCE-6282. Reuse historyFileAbsolute.getFileSystem in
    CompletedJob#loadFullHistoryData for code optimization.
    (zxu via rkanter)

    MAPREDUCE-6307. Remove property
    mapreduce.tasktracker.taskmemorymanager.monitoringinterval.
    (J.Andreina via aajisaka)

    MAPREDUCE-6192. Create unit test to automatically compare
    MR related classes and mapred-default.xml (rchiang via rkanter)

    MAPREDUCE-6279. AM should explicity exit JVM after all services have
    stopped (Eric Payne via jlowe)

    MAPREDUCE-6079. Rename JobImpl#username to reporterUserName.
    (Tsuyoshi Ozawa via aajisaka)

    MAPREDUCE-5981. Log levels of certain MR logs can be changed to DEBUG.
    (Varun Saxena via devaraj)

    MAPREDUCE-5248. Let NNBenchWithoutMR specify the replication factor for
    its test (Erik Paulson via jlowe)

    MAPREDUCE-6174. Combine common stream code into parent class for
    InMemoryMapOutput and OnDiskMapOutput. (Eric Payne via gera)

    MAPREDUCE-6383. Pi job (QuasiMonteCarlo) should not try to read the 
    results file if its job fails. (Harsh J via devaraj)

    MAPREDUCE-6354. ShuffleHandler should be able to log shuffle connections
    (Chang Li via jlowe)

    MAPREDUCE-6392. Document mapred class path options.
    (Brahma Reddy Battula via cnauroth)

    MAPREDUCE-6395. Improve the commit failure messages in MRAppMaster recovery.
    (Brahma Reddy Battula via gera)

    MAPREDUCE-6316. Task Attempt List entries should link to the task overview.
    (Siqi Li via gera)

    MAPREDUCE-6305. AM/Task log page should be able to link back to the job.
    (Siqi Li via gera)

    MAPREDUCE-6408. Queue name and user name should be printed on the job page.
    (Siqi Li via gera)

    MAPREDUCE-6384. Add the last reporting reducer info for too many fetch
    failure diagnostics (Chang Li via jlowe)

    MAPREDUCE-5762. Port MAPREDUCE-3223 and MAPREDUCE-4695 (Remove MRv1 config
    from mapred-default.xml) to branch-2. (aajisaka)

    MAPREDUCE-6443. Add JvmPauseMonitor to JobHistoryServer. (Robert Kanter
    via junping_du)

    MAPREDUCE-6477. Replace usage of deprecated NameNode.DEFAULT_PORT in
    TestFileSystem. (Mingliang Liu via wheat9)

    MAPREDUCE-6483. Replace deprecated method NameNode.getUri() with
    DFSUtilClient.getNNUri() in TestMRCredentials. (Mingliang Liu via wheat9)

    HADOOP-12428. Fix inconsistency between log-level guards and statements.
    (Jagadesh Kiran N and Jackie Chang via ozawa)

    MAPREDUCE-6479. Add missing mapred job command options in mapreduce
    document. (nijel via aajisaka)

    MAPREDUCE-6489. Fail fast rogue tasks that write too much to local disk
    (Maysam Yabandeh via jlowe)

    MAPREDUCE-5763. Warn message about httpshuffle in NM logs.
    (Akira AJISAKA via ozawa)

    MAPREDUCE-5485. Allow repeating job commit by extending OutputCommitter
    API. Contributed by Junping Du

    MAPREDUCE-6499. Add elapsed time for retired job in JobHistoryServer WebUI.
    (Lin Yiqun via aajisaka)

    MAPREDUCE-5870. Support for passing Job priority through Application
    Submission Context in Mapreduce Side (Sunil G via jlowe)

    MAPREDUCE-6566. Add retry support to mapreduce CLI tool.
    (Varun Vasudev via xgong)

    MAPREDUCE-6574. MR AM should print host of failed tasks. 
    (Mohammad Shahid Khan via wangda)

    MAPREDUCE-6584. Remove trailing whitespaces from mapred-default.xml
    (aajisaka)

  OPTIMIZATIONS

    MAPREDUCE-6376. Add avro binary support for jhist files (Ray Chiang via
    jlowe)

    MAPREDUCE-6394. Speed up Task processing loop in HsTasksBlock#render()
    (Ray Chiang via jlowe)

    MAPREDUCE-6473. Job submission can take a long time during Cluster
    initialization (Kuhu Shukla via jlowe)

  BUG FIXES

    MAPREDUCE-6314. TestPipeApplication fails on trunk.
    (Varun Vasudev via harsh)

    MAPREDUCE-5448. MapFileOutputFormat#getReaders bug with hidden
    files/folders. (Maysam Yabandeh via harsh)

    MAPREDUCE-6213. NullPointerException caused by job history server addr not
    resolvable. (Peng Zhang via harsh)

    MAPREDUCE-6281. Fix javadoc in Terasort. (Albert Chu via ozawa)

    MAPREDUCE-6242. Progress report log is incredibly excessive in 
    application master. (Varun Saxena via devaraj)

    MAPREDUCE-6294. Remove an extra parameter described in Javadoc of
    TockenCache. (Brahma Reddy Battula via ozawa)

    MAPREDUCE-5875. Make Counter limits consistent across JobClient, 
    MRAppMaster, and YarnChild. (Gera Shegalov via kasha)

    MAPREDUCE-6199. AbstractCounters are not reset completely on
    deserialization (adhoot via rkanter)

    MAPREDUCE-6286. A typo in HistoryViewer makes some code useless, which
    causes counter limits are not reset correctly.
    (Zhihai Xu via harsh)

    MAPREDUCE-4844. Counters / AbstractCounters have constant references not
    declared final. (Brahma Reddy Battula via gera)

    MAPREDUCE-6266. Job#getTrackingURL should consistently return a proper URL
    (rchiang via rkanter)

    MAPREDUCE-6293. Set job classloader on uber-job's LocalContainerLauncher
    event thread. (Sangjin Lee via gera)

    MAPREDUCE-6297. Task Id of the failed task in diagnostics should link to
    the task page. (Siqi Li via gera)

    MAPREDUCE-6330. Fix typo in Task Attempt API's URL in documentations.
    (Ryu Kobayashi via ozawa)

    MAPREDUCE-6333. TestEvents,TestAMWebServicesTasks,TestAppController are
    broken due to MAPREDUCE-6297. (Siqi Li via gera)

    MAPREDUCE-6341. Fix typo in mapreduce tutorial. (John Michael Luy
    via ozawa)

    MAPREDUCE-6345. Documentation fix for when CRLA is enabled for MRAppMaster
    logs. (Rohit Agarwal via gera)

    MAPREDUCE-5905. CountersStrings.toEscapedCompactStrings outputs
    unnecessary "null" strings. (Akira AJISAKA via ozawa)

    MAPREDUCE-6349. Fix typo in property org.apache.hadoop.mapreduce.
    lib.chain.Chain.REDUCER_INPUT_VALUE_CLASS. (Ray Chiang via ozawa)

    MAPREDUCE-6165. [JDK8] TestCombineFileInputFormat failed on JDK8.
    (Akira AJISAKA via ozawa)

    MAPREDUCE-6356. Misspelling of threshold in log4j.properties for tests.
    (Brahma Reddy Battula via aajisaka)

    MAPREDUCE-6342. Make POM project names consistent. (Rohith via devaraj)

    MAPREDUCE-3383. Duplicate job.getOutputValueGroupingComparator() in
    ReduceTask (Binglin Chang via jlowe)

    MAPREDUCE-4750. Enable NNBenchWithoutMR in MapredTestDriver (Liang Xie
    and Jason Lowe via raviprak)

    MAPREDUCE-6359. In RM HA setup, "Cluster" tab links populated with AM 
    hostname instead of RM. (zhaoyunjiong via junping_du)

    MAPREDUCE-6353. Divide by zero error in MR AM when calculating available 
    containers. (Anubhav Dhoot via kasha)

    MAPREDUCE-5465. Tasks are often killed before they exit on their own
    (Ming Ma via jlowe)

    MAPREDUCE-6360. TestMapreduceConfigFields is placed in wrong dir, 
    introducing compile error (Arshad Mohammad via vinayakumarb)

    MAPREDUCE-6366. mapreduce.terasort.final.sync configuration in TeraSort
    doesn't work. (Takuya Fukudome via ozawa)

    MAPREDUCE-5708. Duplicate String.format in YarnOutputFiles.getSpillFileForWrite.
    (Konstantin Weitz via devaraj)

    MAPREDUCE-6204. TestJobCounters should use new properties instead of
    JobConf.MAPRED_TASK_JAVA_OPTS. (Sam Liu via ozawa)

    MAPREDUCE-6374. Distributed Cache File visibility should check permission
    of full path (Chang Li via jlowe)

    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" (wilfreds via rkanter)

    MAPREDUCE-6382. Don't escape HTML links in Diagnostics in JHS job overview.
    (Siqi Li via gera)

    MAPREDUCE-5232. Add a configuration to be able to log classpath and other
    system properties on mapreduce JVMs startup.  (Sangjin Lee via vinodkv)

    MAPREDUCE-6388. Remove deprecation warnings from JobHistoryServer classes
    (Ray Chiang via ozawa).

    MAPREDUCE-6350. JobHistory doesn't support fully-functional search. 
    (Siqi Li via devaraj)

    MAPREDUCE-6389. Fix BaileyBorweinPlouffe CLI usage message. (Brahma Reddy Battula
    via devaraj)

    MAPREDUCE-6373. The logger reports total input paths but it is referring
    to input files. (Bibin A Chundatt via devaraj)

    MAPREDUCE-6405. NullPointerException in App Attempts page.
    (Siqi Li and Gera Shegalov via devaraj)

    MAPREDUCE-6403. Fix typo in the usage of NNBench.
    (Jagadesh Kiran N via aajisaka)

    MAPREDUCE-6400. Multiple shuffle transfer fails because input is closed
    too early (Brahma Reddy Battula, Akira AJISAKA, and Gera Shegalov via
    jlowe)

    MAPREDUCE-6413. TestLocalJobSubmission is failing with unknown host
    (zhihai xu via jlowe)

    MAPREDUCE-6121. JobResourceUpdater#compareFs() doesn't handle HA namespaces
    (rchiang via rkanter)

    MAPREDUCE-6420. Interrupted Exception in LocalContainerLauncher should be
    logged in warn/info level (Chang Li via jlowe)

    MAPREDUCE-6418. MRApp should not shutdown LogManager during shutdown
    (Chang Li via jlowe)

    MAPREDUCE-6038. A boolean may be set error in the Word Count v2.0 in
    MapReduce Tutorial. (Tsuyoshi Ozawa via cdouglas)

    MAPREDUCE-6421. Fix findbugs warning in
    RMContainerAllocator.reduceNodeLabelExpression.
    (Brahma Reddy Battula via aajisaka)

    MAPREDUCE-6427. Fix typo in JobHistoryEventHandler. (Ray Chiang via cdouglas)

    MAPREDUCE-6433. launchTime may be negative. (Zhihai Xu)

    MAPREDUCE-5817. Mappers get rescheduled on node transition even after all
    reducers are completed. (Sangjin Lee via kasha)

    MAPREDUCE-6357. MultipleOutputs.write() API should document that output
    committing is not utilized when input path is absolute.
    (Dustin Cote via aajisaka)

    MAPREDUCE-6357. MultipleOutputs.write() API should document that output
    committing is not utilized when input path is absolute.
    (Dustin Cote via aajisaka)

    MAPREDUCE-6452. NPE when intermediate encrypt enabled for LocalRunner.
    (Zhihai Xu)

    MAPREDUCE-5002. AM could potentially allocate a reduce container to a map
    attempt (Chang Li via jlowe)

    MAPREDUCE-6460. TestRMContainerAllocator.
    testAttemptNotFoundCausesRMCommunicatorException fails. (Zhihai Xu)

    MAPREDUCE-6484. Yarn Client uses local address instead of RM address as
    token renewer in a secure cluster when RM HA is enabled. (Zhihai Xu)

    MAPREDUCE-6480. archive-logs tool may miss applications (rkanter)

    MAPREDUCE-6494. Permission issue when running archive-logs tool as
    different users (rkanter)

    MAPREDUCE-6485. Create a new task attempt with failed map task priority
    if in-progress attempts are unassigned. (Xianyin Xin via rohithsharmaks)

    MAPREDUCE-6503. archive-logs tool should use HADOOP_PREFIX instead
    of HADOOP_HOME (rkanter)

    MAPREDUCE-6302. Preempt reducers after a configurable timeout irrespective
    of headroom. (kasha)

    MAPREDUCE-6495. Docs for archive-logs tool (rkanter)

    MAPREDUCE-6508. TestNetworkedJob fails consistently due to delegation
    token changes on RM. (Akira AJISAKA via junping_du)

    MAPREDUCE-6515. Update Application priority in AM side from AM-RM heartbeat
    (Sunil G via jlowe)

    MAPREDUCE-6533. testDetermineCacheVisibilities of
    TestClientDistributedCacheManager is broken (Chang Li via jlowe)

    MAPREDUCE-6540. TestMRTimelineEventHandling fails (sjlee)

    MAPREDUCE-6553. Replace '\u2b05' with '<-' in rendering job configuration.
    (Gabor Liptak via aajisaka)

    MAPREDUCE-6557. Tests in mapreduce-client-app are writing outside of
    target. (Akira AJISAKA via junping_du)

    MAPREDUCE-6550. archive-logs tool changes log ownership to the Yarn
    user when using DefaultContainerExecutor (rkanter)

    MAPREDUCE-6419. JobHistoryServer doesn't sort properly based on Job ID when Job id's 
    exceed 9999. (Mohammad Shahid Khan via rohithsharmaks)

    MAPREDUCE-6589. TestTaskLog outputs a log under directory other than
    target/test-dir. (aajisaka)

    MAPREDUCE-6593. TestJobHistoryEventHandler.testTimelineEventHandling fails
    on trunk because of NPE. (Naganarasimha G R via aajisaka)

    MAPREDUCE-6068. Illegal progress value warnings in map tasks. (Binglin Chang
    via junping_du)

    MAPREDUCE-6601. Fix typo in Job#setUseNewAPI. (Kai Sasaki via aajisaka)

    MAPREDUCE-6605. Fix typos mapreduce.map.skip.proc.count.autoincr and
    mapreduce.reduce.skip.proc.count.autoincr in mapred-default.xml.
    (Kai Sasaki via aajisaka)

    MAPREDUCE-6614. Remove unnecessary code in TestMapreduceConfigFields.
    (Kai Sasaki via aajisaka)

    MAPREDUCE-6610. JobHistoryEventHandler should not swallow timeline response
    (Li Lu via jianhe)

    MAPREDUCE-6619. HADOOP_CLASSPATH is overwritten in MR container.
    (Junping Du via jianhe)

Release 2.7.3 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6377. JHS sorting on state column not working in webUi.
    (zhihai xu via devaraj)

    MAPREDUCE-5883. "Total megabyte-seconds" in job counters is slightly
    misleading (Nathan Roberts via jlowe)

    MAPREDUCE-6583. Clarify confusing sentence in MapReduce tutorial document.
    (Kai Sasaki via aajisaka)

    MAPREDUCE-6554. MRAppMaster servicestart failing with NPE in
    MRAppMaster#parsePreviousJobHistory (Bibin A Chundatt via jlowe)

Release 2.7.2 - 2016-01-25

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6425. ShuffleHandler passes wrong "base" parameter to getMapOutputInfo
    if mapId is not in the cache. (zhihai xu via devaraj)

    MAPREDUCE-6426. TestShuffleHandler#testGetMapOutputInfo is failing.
    (zhihai xu via devaraj)

    MAPREDUCE-6439. AM may fail instead of retrying if RM shuts down during the
    allocate call. (Anubhav Dhoot via kasha)

    MAPREDUCE-6442. Stack trace is missing when error occurs in client protocol
    provider's constructor (Chang Li via ozawa)

    MAPREDUCE-6474. ShuffleHandler can possibly exhaust nodemanager file
    descriptors (Kuhu Shukla via jlowe)

    MAPREDUCE-6472. MapReduce AM should have java.io.tmpdir=./tmp to be
    consistent with tasks (Naganarasimha G R via jlowe)

    MAPREDUCE-5948. org.apache.hadoop.mapred.LineRecordReader does not handle
    multibyte record delimiters well (Vinayakumar B, Rushabh Shah, and Akira
    AJISAKA via jlowe)

    MAPREDUCE-6481. LineRecordReader may give incomplete record and wrong
    position/key information for uncompressed input sometimes. (Zhihai Xu via
    jlowe)

    MAPREDUCE-5982. Task attempts that fail from the ASSIGNED state can
    disappear (Chang Li via jlowe)

    MAPREDUCE-6492. AsyncDispatcher exit with NPE on
    TaskAttemptImpl#sendJHStartEventForAssignedFailTask (Bibin A Chundatt via
    jlowe)

    MAPREDUCE-6518. Set SO_KEEPALIVE on shuffle connections (Chang Li via
    jlowe)

    MAPREDUCE-6273. HistoryFileManager should check whether summaryFile exists to 
    avoid FileNotFoundException causing HistoryFileInfo into MOVE_FAILED state.
    (zhihai xu via devaraj)

    MAPREDUCE-6528. Memory leak for HistoryFileManager.getJobSummary()
    (Junping Du via jlowe)

    MAPREDUCE-6451. DistCp has incorrect chunkFilePath for multiple jobs when
    strategy is dynamic (Kuhu Shukla via kihwal)

Release 2.7.1 - 2015-07-06 

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6252. JobHistoryServer should not fail when encountering a 
    missing directory. (Craig Welch via devaraj)

    MAPREDUCE-6334. Fetcher#copyMapOutput is leaking usedMemory upon
    IOException during InMemoryMapOutput shuffle handler (Eric Payne via jlowe)

    MAPREDUCE-6339. Job history file is not flushed correctly because isTimerActive 
    flag is not set true when flushTimerTask is scheduled. (zhihai xu via devaraj)

    MAPREDUCE-6259. IllegalArgumentException due to missing job submit time
    (zhihai xu via jlowe)

    MAPREDUCE-6251. Added a new config for JobClient to retry JobStatus calls so
    that they don't fail on history-server backed by DFSes with not so strong
    guarantees. (Craig Welch via vinodkv)

    MAPREDUCE-6387. Serialize the recently added Task#encryptedSpillKey field at 
    the end. (Arun Suresh via kasha)

    MAPREDUCE-6410. Fixed MapReduce JobHistory server to use the right (login)
    UGI to refresh log and cleaner settings. (Varun Saxena via vinodkv)

Release 2.7.0 - 2015-04-20

  INCOMPATIBLE CHANGES

  NEW FEATURES

    MAPREDUCE-6227. DFSIO for truncate. (shv via yliu)

    MAPREDUCE-6228. Add truncate operation to SLive. (Plamen Jeliazkov via shv)

    MAPREDUCE-5583. Ability to limit running map and reduce tasks. 
    (Jason Lowe via junping_du)

  IMPROVEMENTS

    MAPREDUCE-6149. Document override log4j.properties in MR job.
    (Junping Du via harsh)

    MAPREDUCE-6194. Bubble up final exception in failures during creation
    of output collectors (Varun Saxena via harsh)

    MAPREDUCE-5420. Remove mapreduce.task.tmp.dir from mapred-default.xml
    (James Carman via harsh)

    MAPREDUCE-5932. Provide an option to use a dedicated reduce-side shuffle
    log (Gera Shegalov via jlowe)

    MAPREDUCE-6046. Change the class name for logs in RMCommunicator
    (Sahil Takiar via devaraj)

    HADOOP-11032. Replace use of Guava's Stopwatch with Hadoop's StopWatch
    (ozawa)

    MAPREDUCE-6173. Document the configuration of deploying MR over distributed
    cache with enabling wired encryption at the same time. 
    (Junping Du via xgong)

    MAPREDUCE-6141. History server leveldb recovery store (jlowe)

    MAPREDUCE-6150. Update document of Rumen (Masatake Iwasaki via aw)

    MAPREDUCE-6151. Update document of GridMix (Masatake Iwasaki via aw)

    MAPREDUCE-6143. add configuration for mapreduce speculative execution in
    MR2 (zxu via rkanter)

    MAPREDUCE-5800. Use Job#getInstance instead of deprecated constructors
    (aajisaka)

    MAPREDUCE-6253. Update use of Iterator to Iterable. (Ray Chiang via devaraj)

    MAPREDUCE-5335. Rename Job Tracker terminology in ShuffleSchedulerImpl.
    (devaraj via ozawa)

    MAPREDUCE-4431. mapred command should print the reason on killing already 
    completed jobs. (devaraj via ozawa)

    MAPREDUCE-6255. Fix JobCounter's format to use grouping separator.
    (Ryu Kobayashi via ozawa)

    MAPREDUCE-6256. Removed unused private methods in o.a.h.mapreduce.Job.java.
    (Naganarasimha G R via ozawa)

    MAPREDUCE-6225. Fix new findbug warnings in hadoop-mapreduce-client-core. 
    (Varun Saxena via junping_du)

    MAPREDUCE-6264. Remove httpclient dependency from hadoop-mapreduce-client.
    (Brahma Reddy Battula via aajisaka)

    MAPREDUCE-5612. Add javadoc for TaskCompletionEvent.Status.
    (Chris Palmer via aajisaka)

    MAPREDUCE-6248. Exposed the internal MapReduce job's information as a public
    API in DistCp. (Jing Zhao via vinodkv)

    MAPREDUCE-6263. Configurable timeout between YARNRunner terminate the 
    application and forcefully kill. (Eric Payne via junping_du)

    MAPREDUCE-6265. Make ContainerLauncherImpl.INITIAL_POOL_SIZE configurable 
    to better control to launch/kill containers. (Zhihai Xu via ozawa)

    MAPREDUCE-6292. Use org.junit package instead of junit.framework in
    TestCombineFileInputFormat. (aajisaka)

  OPTIMIZATIONS

    MAPREDUCE-6169. MergeQueue should release reference to the current item 
    from key and value at the end of the iteration to save memory. 
    (Zhihai Xu via kasha)

    MAPREDUCE-6059. Speed up history server startup time (Siqi Li via aw)

    MAPREDUCE-4815. Speed up FileOutputCommitter#commitJob for many output
    files. (Siqi Li via gera)

  BUG FIXES

    MAPREDUCE-6210. Use getApplicationAttemptId() instead of getApplicationId()
    for logging AttemptId in RMContainerAllocator.java (Leitao Guo via aajisaka)

    MAPREDUCE-6177. Minor typo in the EncryptedShuffle document about
    ssl-client.xml (Yangping Wu via harsh)

    MAPREDUCE-5918. LineRecordReader can return the same decompressor to
    CodecPool multiple times (Sergey Murylev via raviprak)

    MAPREDUCE-6162. mapred hsadmin fails on a secure cluster (jlowe)

    MAPREDUCE-6049. AM JVM does not exit if MRClientService graceful shutdown
    fails (Rohith via devaraj)

    MAPREDUCE-5568. Fixed CompletedJob in JHS to show progress percentage
    correctly in case the number of mappers or reducers is zero. (MinJi Kim via
    jianhe)
 
    MAPREDUCE-6172. TestDbClasses timeouts are too aggressive (Varun Saxena
    via jlowe)

    MAPREDUCE-6160. Potential NullPointerException in MRClientProtocol
    interface implementation. (Rohith via jlowe)

    MAPREDUCE-4879. TeraOutputFormat may overwrite an existing output
    directory. (gera)

    MAPREDUCE-6045. need close the DataInputStream after open it in
    TestMapReduce.java (zxu via rkanter)

    MAPREDUCE-6206. TestAggregatedTransferRate fails on non-US systems (Jens
    Rabe via jlowe)

    MAPREDUCE-3283. mapred classpath CLI does not display the complete classpath
    (Varun Saxena via cnauroth)

    MAPREDUCE-6231. Grep example job is not working on a fully-distributed
    cluster. (aajisaka)

    MAPREDUCE-6243. Fix findbugs warnings in hadoop-rumen. (Masatake Iwasaki
    via aajisaka)

    MAPREDUCE-5988. Fix dead links to the javadocs in mapreduce project.
    (aajisaka)

    MAPREDUCE-6186. Redundant call to requireJob() while displaying the conf
    page (Rohit Agarwal via jlowe)

    MAPREDUCE-6233. org.apache.hadoop.mapreduce.TestLargeSort.testLargeSort
    failed in trunk (zxu via rkanter)

    MAPREDUCE-6221. Stringifier is left unclosed in Chain#getChainElementConf().
    (Ted Yu via ozawa)

    MAPREDUCE-4286. TestClientProtocolProviderImpls passes on failure 
    conditions. (Devaraj K via ozawa)

    MAPREDUCE-6261. NullPointerException if MapOutputBuffer.flush invoked
    twice (Tsuyoshi OZAWA via jlowe)

    MAPREDUCE-2815. JavaDoc does not generate correctly for
    MultithreadedMapRunner. (Chris Palmer via aajisaka)

    MAPREDUCE-6268. Fix typo in Task Attempt API's URL. (Ryu Kobayashi
    via ozawa)

    MAPREDUCE-6136. MRAppMaster doesn't shutdown file systems. (Brahma 
    Reddy Battula via ozawa)

    MAPREDUCE-5657. [JDK8] Fix Javadoc errors caused by incorrect or illegal
    tags in doc comments. (Akira AJISAKA and Andrew Purtell via ozawa)

    MAPREDUCE-4742. Fix typo in nnbench#displayUsage. (Liang Xie via ozawa)

    MAPREDUCE-6277. Job can post multiple history files if attempt loses
    connection to the RM (Chang Li via jlowe)

    MAPREDUCE-6275. Race condition in FileOutputCommitter v2 for
    user-specified task output subdirs (Gera Shegalov and Siqi Li via jlowe)

    MAPREDUCE-6285. ClientServiceDelegate should not retry upon
    AuthenticationException. (Jonathan Eagles via ozawa)

Release 2.6.4 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  MAPREDUCE-6436. JobHistory cache issue. (Kai Sasaki via zxu)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6577. MR AM unable to load native library without
    MR_AM_ADMIN_USER_ENV set (sjlee)

    MAPREDUCE-5982. Task attempts that fail from the ASSIGNED state can
    disappear (Chang Li via jlowe)

    MAPREDUCE-6492. AsyncDispatcher exit with NPE on
    TaskAttemptImpl#sendJHStartEventForAssignedFailTask (Bibin A Chundatt via
    jlowe)

    MAPREDUCE-6363. [NNBench] Lease mismatch error when running with multiple
    mappers. (Vlad Sharanhovich and Bibin A Chundatt via aajisaka)

    MAPREDUCE-6554. MRAppMaster servicestart failing with NPE in
    MRAppMaster#parsePreviousJobHistory (Bibin A Chundatt via jlowe)

Release 2.6.3 - 2015-12-17

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6273. HistoryFileManager should check whether summaryFile exists to 
    avoid FileNotFoundException causing HistoryFileInfo into MOVE_FAILED state.
    (zhihai xu via devaraj)

    MAPREDUCE-6528. Memory leak for HistoryFileManager.getJobSummary()
    (Junping Du via jlowe)

    MAPREDUCE-6377. JHS sorting on state column not working in webUi.
    (zhihai xu via devaraj)

    MAPREDUCE-5948. org.apache.hadoop.mapred.LineRecordReader does not handle
    multibyte record delimiters well (Vinayakumar B, Rushabh Shah, and Akira
    AJISAKA via jlowe)

    MAPREDUCE-6481. LineRecordReader may give incomplete record and wrong
    position/key information for uncompressed input sometimes. (Zhihai Xu via
    jlowe)

    MAPREDUCE-5883. "Total megabyte-seconds" in job counters is slightly
    misleading (Nathan Roberts via jlowe)

    MAPREDUCE-6549. multibyte delimiters with LineRecordReader cause 
    duplicate records (wilfreds via rkanter)

Release 2.6.2 - 2015-10-28

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6454. Fixed MapReduce to modify HADOOP_CLASSPATH to have distributed
    cache files so that child processes running hadoop scripts can access these
    files. (Junping Du via vinodkv)

    MAPREDUCE-6334. Fetcher#copyMapOutput is leaking usedMemory upon
    IOException during InMemoryMapOutput shuffle handler (Eric Payne via jlowe)

    MAPREDUCE-6497. Fix wrong value of JOB_FINISHED event in
    JobHistoryEventHandler. (Shinichi Yamashita via aajisaka)

Release 2.6.1 - 2015-09-23

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6237. Multiple mappers with DBInputFormat don't work because of
    reusing conections. (Kannan Rajah via ozawa)

    MAPREDUCE-6166. Reducers do not validate checksum of map outputs when
    fetching directly to disk. (Eric Payne via gera)

    MAPREDUCE-6230. Fixed RMContainerAllocator to update the new AMRMToken
    service name properly. (Jason Lowe via jianhe)

    MAPREDUCE-6303. Read timeout when retrying a fetch error can be fatal 
    to a reducer. (Jason Lowe via junping_du)

    MAPREDUCE-6300. Task list sort by task id broken. (Siqi Li via aajisaka)

    MAPREDUCE-6267. Refactor JobSubmitter#copyAndConfigureFiles into it's own 
    class. (Chris Trezzo via kasha)

    MAPREDUCE-6238. MR2 can't run local jobs with -libjars command options
    which is a regression from MR1 (zxu via rkanter)

    MAPREDUCE-6324. Fixed MapReduce uber jobs to not fail the udpate of AM-RM
    tokens when they roll-over. (Jason Lowe via vinodkv)

    MAPREDUCE-5649. Reduce cannot use more than 2G memory for the final merge
    (Gera Shegalov via jlowe)

    MAPREDUCE-6361. NPE issue in shuffle caused by concurrent issue between
    copySucceeded() in one thread and copyFailed() in another thread on the
    same host. (Junping Du via ozawa)

Release 2.6.0 - 2014-11-18

  INCOMPATIBLE CHANGES

  NEW FEATURES
    MAPREDUCE-5910. Make MR AM resync with RM in case of work-preserving
    RM-restart. Contributed by Rohith

    MAPREDUCE-5933. Enabled MR AM to post history events to the timeline server.
    (Robert Kanter via zjshen)

  IMPROVEMENTS

    MAPREDUCE-5971. Move the default options for distcp -p to
    DistCpOptionSwitch. (clamb via wang)

    MAPREDUCE-5963. ShuffleHandler DB schema should be versioned with
    compatible/incompatible changes (Junping Du via jlowe)

    MAPREDUCE-6019. MapReduce changes for exposing YARN/MR endpoints on multiple
    interfaces. (Craig Welch, Milan Potocnik, Arpit Agarwal via xgong)

    MAPREDUCE-883. harchive: Document how to unarchive (Akira AJISAKA and
      Koji Noguchi via aw)

    MAPREDUCE-4791. Javadoc for KeyValueTextInputFormat should include default 
      separator and how to change it (Akira AJISAKA via aw)

    MAPREDUCE-5906. Inconsistent configuration in property 
      "mapreduce.reduce.shuffle.input.buffer.percent" (Akira AJISAKA via aw)

    MAPREDUCE-5974. Allow specifying multiple MapOutputCollectors with 
    fallback. (Todd Lipcon via kasha)

    MAPREDUCE-5130. Add missing job config options to mapred-default.xml
    (Ray Chiang via Sandy Ryza)

    MAPREDUCE-5891. Improved shuffle error handling across NM restarts
    (Junping Du via jlowe)

    MAPREDUCE-5279. Made MR headroom calculation honor cpu dimension when YARN
    scheduler resource type is memory plus cpu. (Peng Zhang and Varun Vasudev
    via zjshen)

    MAPREDUCE-6072. Remove INSTALL document (Akira AJISAKA via aw)

    MAPREDUCE-5970. Provide a boolean switch to enable MR-AM profiling (Gera
    Shegalov via jlowe)

    MAPREDUCE-6018. Added an MR specific config to enable emitting job history
    data to the timeline server. (Robert Kanter via zjshen)

    MAPREDUCE-6052. Supported overriding the default container-log4j.properties
    file per job. (Junping Du via zjshen)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-5866. TestFixedLengthInputFormat fails in windows.
    (Varun Vasudev via cnauroth)

    MAPREDUCE-5956. Made MR AM not use maxAttempts to determine if the current
    attempt is the last retry. (Wangda Tan via zjshen)

    MAPREDUCE-5957. AM throws ClassNotFoundException with job classloader
    enabled if custom output format/committer is used (Sangjin Lee via jlowe)

    MAPREDUCE-5756. CombineFileInputFormat.getSplits() including directories
    in its results (Jason Dere via jlowe)

    MAPREDUCE-6014. New task status field in task attempts table can lead to
    an empty web page (Mit Desai via jlowe)

    MAPREDUCE-6021. MR AM should have working directory in LD_LIBRARY_PATH
    (jlowe)

    MAPREDUCE-5944. Remove MRv1 commands from CommandsManual.apt.vm
      (Akira AJISAKA via aw)

    MAPREDUCE-5943. Separate mapred commands from CommandManual.apt.vm
      (Akira AJISAKA via aw)

    MAPREDUCE-5363. Fix doc and spelling for TaskCompletionEvent#getTaskStatus 
      and getStatus (Akira AJISAKA via aw)

    MAPREDUCE-6010. HistoryServerFileSystemStateStore fails to update tokens
    (jlowe)

    MAPREDUCE-5595. Typo in MergeManagerImpl.java (Akira AJISAKA via aw)

    MAPREDUCE-5597. Missing alternatives in javadocs for deprecated constructors 
      in mapreduce.Job (Akira AJISAKA via aw)

    MAPREDUCE-5950. incorrect description in distcp2 document (Akira AJISAKA 
      via aw)

    MAPREDUCE-5998. CompositeInputFormat javadoc is broken (Akira AJISAKA via
      aw)

    MAPREDUCE-5999. Fix dead link in InputFormat javadoc (Akira AJISAKA via aw)

    MAPREDUCE-5878. some standard JDK APIs are not part of system classes
    defaults (Sangjin Lee via jlowe)

    MAPREDUCE-6032. Made MR jobs write job history files on the default FS when
    the current context's FS is different. (Benjamin Zhitomirsky via zjshen)

    MAPREDUCE-6024. Shortened the time when Fetcher is stuck in retrying before
    concluding the failure by configuration. (Yunjiong Zhao via zjshen)

    MAPREDUCE-6036. TestJobEndNotifier fails intermittently in branch-2 (chang
    li via jlowe)

    MAPREDUCE-6012. DBInputSplit creates invalid ranges on Oracle. 
    (Wei Yan via kasha)

    MAPREDUCE-6044. Fully qualified intermediate done dir path breaks per-user dir
    creation on Windows. (zjshen)

    MAPREDUCE-5885. build/test/test.mapred.spill causes release audit warnings
    (Chen He via jlowe)

    BREAKDOWN OF HDFS-6134 AND HADOOP-10150 SUBTASKS AND RELATED JIRAS

      MAPREDUCE-5890. Support for encrypting Intermediate 
      data and spills in local filesystem. (asuresh via tucu)

      MAPREDUCE-6007. Add support to distcp to preserve raw.* namespace
      extended attributes. (clamb)

      MAPREDUCE-6041. Fix TestOptionsParser. (clamb)
    --

    MAPREDUCE-6051. Fix typos in log messages. (Ray Chiang via cdouglas)

    MAPREDUCE-5931. Validate SleepJob command line parameters (Gera Shegalov
    via jlowe)

    MAPREDUCE-6063. Correct spill size calculation for spills wrapping the
    circular buffer. (zhihai xu via cdouglas)

    MAPREDUCE-6071. JobImpl#makeUberDecision doesn't log that Uber mode is
    disabled because of too much CPUs (Tsuyoshi OZAWA via jlowe)

    MAPREDUCE-6075. HistoryServerFileSystemStateStore can create zero-length
    files (jlowe)

    MAPREDUCE-6070. yarn.app.am.resource.mb/cpu-vcores affects uber mode but
    is not documented (Tsuyoshi OZAWA via jlowe)

    MAPREDUCE-6090. mapred hsadmin getGroups fails to connect in some cases
    (Robert Kanter via jlowe)

    MAPREDUCE-6086. mapreduce.job.credentials.binary should allow all URIs. 
    (Zhihai Xu via kasha)

    MAPREDUCE-6091. YARNRunner.getJobStatus() fails with
    ApplicationNotFoundException if the job rolled off the RM view (Sangjin
    Lee via jlowe)

    MAPREDUCE-6095. Enable DistributedCache for uber-mode Jobs (Gera Shegalov
    via jlowe)

    MAPREDUCE-6104. TestJobHistoryParsing.testPartialJob fails in branch-2
    (Mit Desai via jlowe)

    MAPREDUCE-6109. Fix minor typo in distcp -p usage text (Charles Lamb
    via aw)

    MAPREDUCE-6093. minor distcp doc edits (Charles Lamb via aw)

    MAPREDUCE-5831. Make MR client ignore unknown counters received from AM.
    (Junping Du via zjshen)

    MAPREDUCE-6073. Description of mapreduce.job.speculative.slowtaskthreshold
    in mapred-default should be moved into description tags (Tsuyoshi OZAWA 
    via aw)

    MAPREDUCE-5796. Use current version of the archive name in 
    DistributedCacheDeploy document (Akira AJISAKA via aw)

    MAPREDUCE-5945. Update the description of GenericOptionsParser -jt 
    option (Akira AJISAKA via aw)

    MAPREDUCE-6087. Fixed wrong config name of
    MRJobConfig#MR_CLIENT_TO_AM_IPC_MAX_RETRIES_ON_TIMEOUTS. Contributed by
    Akira AJISAKA. (Akira AJISAKA via jianhe)

    MAPREDUCE-6094. TestMRCJCFileInputFormat.testAddInputPath() fails on trunk
    (Akira AJISAKA via jlowe)

    MAPREDUCE-6029. TestCommitterEventHandler fails in trunk (Mit Desai via
    jlowe)

    MAPREDUCE-6122. TestLineRecordReader may fail due to test data files checked
    out of git with incorrect line endings. (cnauroth)

    MAPREDUCE-6123. TestCombineFileInputFormat incorrectly starts 2
    MiniDFSCluster instances. (cnauroth)

    MAPREDUCE-6125. TestContainerLauncherImpl sometimes fails (Mit Desai via
    jlowe)

    MAPREDUCE-6115. TestPipeApplication#testSubmitter fails in trunk (Binglin
    Chang via jlowe)

    MAPREDUCE-5873. Shuffle bandwidth computation includes time spent waiting
    for maps (Siqi Li via jlowe)

    MAPREDUCE-5542. Killing a job just as it finishes can generate an NPE in
    client (Rohith via jlowe)

    MAPREDUCE-6126. Fixed Rumen JobBuilder to ignore NormalizedResourceEvent.
    (Junping Du via jianhe)

    MAPREDUCE-6142. Fixed test failures in TestJobHistoryEventHandler and
    TestMRTimelineEventHandling. (Zhijie Shen via vinodkv)

    MAPREDUCE-6022. map_input_file is missing from streaming job environment.
    (jlowe via kihwal)

    MAPREDUCE-6048. Fixed TestJavaSerialization failure. (Varun Vasudev via
    jianhe)

    MAPREDUCE-5960. JobSubmitter's check whether job.jar is local is incorrect
    with no authority in job jar path. (Gera Shegalov via jlowe)

    MAPREDUCE-5958. Wrong reduce task progress if map output is compressed
    (Emilio Coppa and jlowe via kihwal)

    MAPREDUCE-6156. Fetcher - connect() doesn't handle connection refused
    correctly (Junping Du via jlowe)

Release 2.5.2 - 2014-11-19

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES


Release 2.5.1 - 2014-09-05

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-6033. Updated access check for displaying job information
    (Yu Gao via Eric Yang)

Release 2.5.0 - 2014-08-11

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-5671. NaN can be created by client and assign to Progress (Chen
    He via jeagles)

    MAPREDUCE-5665. Add audience annotations to MiniMRYarnCluster and 
    MiniMRCluster. (Anubhav Dhoot via kasha)

    MAPREDUCE-5765. Update hadoop-pipes examples README (Mit Desai via jeagles)

    MAPREDUCE-5713. InputFormat and JobConf JavaDoc Fixes (Chen He via jeagles)

    MAPREDUCE-5456. TestFetcher.testCopyFromHostExtraBytes is missing (Jason
    Lowe via jeagles)

    MAPREDUCE-5804. TestMRJobsWithProfiler#testProfiler timesout (Mit Desai
    via kihwal)

    MAPREDUCE-5825. Provide diagnostics for reducers killed during ramp down
    (Gera Shegalov via jlowe)

    MAPREDUCE-5836. Fix typo in RandomTextWriter (Akira AJISAKA via jeagles)

    MAPREDUCE-5852. Prepare MapReduce codebase for JUnit 4.11. (cnauroth)

    MAPREDUCE-5639. Port DistCp2 document to trunk (Akira AJISAKA via jeagles)

    MAPREDUCE-5812. Make job context available to
    OutputCommitter.isRecoverySupported() (Mohammad Kamrul Islam via jlowe)

    MAPREDUCE-5638. Port Hadoop Archives document to trunk (Akira AJISAKA via
    jeagles)

    MAPREDUCE-5402. In DynamicInputFormat, change MAX_CHUNKS_TOLERABLE,
    MAX_CHUNKS_IDEAL, MIN_RECORDS_PER_CHUNK and SPLIT_RATIO to be configurable.
    (Tsuyoshi OZAWA via szetszwo)

    MAPREDUCE-5637. Convert Hadoop Streaming document to APT (Akira AJISAKA via
    jeagles)

    MAPREDUCE-5636. Convert MapReduce Tutorial document to APT (Akira AJISAKA
    via jeagles)

    MAPREDUCE-5774. Job overview in History UI should list reducer phases in
    chronological order. (Gera Shegalov via kasha)

    MAPREDUCE-5652. NM Recovery. ShuffleHandler should handle NM restarts.
    (Jason Lowe via kasha)

    MAPREDUCE-5861. finishedSubMaps field in LocalContainerLauncher does not 
    need to be volatile. (Tsuyoshi OZAWA via junping_du)

    MAPREDUCE-5809. Enhance distcp to support preserving HDFS ACLs. (cnauroth)

    MAPREDUCE-5899. Support incremental data copy in DistCp. (jing9)

    MAPREDUCE-5886. Allow wordcount example job to accept multiple input paths.
    (cnauroth)

    MAPREDUCE-5834. Increased test-timeouts in TestGridMixClasses to avoid
    occassional failures. (Mit Desai via vinodkv)

    MAPREDUCE-5896. InputSplits should indicate which locations have the block 
    cached in memory. (Sandy Ryza via kasha)

    MAPREDUCE-5844. Add a configurable delay to reducer-preemption. 
    (Maysam Yabandeh via kasha)

    MAPREDUCE-5790. Made it easier to enable hprof profile options by default.
    (Gera Shegalov via vinodkv)

  OPTIMIZATIONS

  BUG FIXES 

    MAPREDUCE-5759. Remove unnecessary conf load in Limits (Sandy Ryza)

    MAPREDUCE-5014. Extend Distcp to accept a custom CopyListing. 
    (Srikanth Sundarrajan via amareshwari)

    MAPREDUCE-5775. Remove unnecessary job.setNumReduceTasks in SleepJob.createJob 
    (jhanver chand sharma via devaraj)

    MAPREDUCE-4937. MR AM handles an oversized split metainfo file poorly
    (Eric Payne via jlowe)

    MAPREDUCE-5642. TestMiniMRChildTask fails on Windows.
    (Chuan Liu via cnauroth)

    MAPREDUCE-5846. Rumen doesn't understand JobQueueChangedEvent (Nathan Roberts via raviprak)

    MAPREDUCE-5837. MRAppMaster fails when checking on uber mode. (wheat9)

    MAPREDUCE-5749. TestRMContainerAllocator#testReportedAppProgress Failed
    (jlowe)

    MAPREDUCE-5884. History server uses short user name when canceling tokens
    (Mohammad Kamrul Islam via jlowe)

    MAPREDUCE-5888. Failed job leaves hung AM after it unregisters (Jason Lowe
    via jeagles)

    MAPREDUCE-5814. fat jar with *-default.xml may fail when
    mapreduce.job.classloader=true. (Gera Shegalov via jlowe)

    MAPREDUCE-5309. 2.0.4 JobHistoryParser can't parse certain failed job
    history files generated by 2.0.3 history server (Rushabh S Shah via jlowe)

    MAPREDUCE-5862. Line records longer than 2x split size aren't handled
    correctly (bc Wong via jlowe)

    MAPREDUCE-5895. Close streams properly to avoid leakage in TaskLog. 
    (Kousuke Saruta via devaraj)

    MAPREDUCE-5777. Support utf-8 text with Byte Order Marker.
    (Zhihai Xu via kasha)

    MAPREDUCE-5898. distcp to support preserving HDFS extended attributes(XAttrs)
    (Yi Liu via umamahesh)

    MAPREDUCE-5920. Add Xattr option in DistCp docs. (Yi Liu via cnauroth)

    MAPREDUCE-5924. Changed TaskAttemptImpl to ignore TA_COMMIT_PENDING event
    at COMMIT_PENDING state. (Zhijie Shen via jianhe)

    MAPREDUCE-5939. StartTime showing up as the epoch time in JHS UI after
    upgrade (Chen He via jlowe)

    MAPREDUCE-5900. Changed to the interpret container preemption exit code as a
    task attempt killing event. (Mayank Bansal via zjshen)

    MAPREDUCE-5868. Fixed an issue with TestPipeApplication that was causing the
    nightly builds to fail. (Akira Ajisaka via vinodkv)

    MAPREDUCE-5517. Fixed MapReduce ApplicationMaster to not validate reduce side
    resource configuration for deciding uber-mode on map-only jobs. (Siqi Li via
    vinodkv)

    MAPREDUCE-5952. LocalContainerLauncher#renameMapOutputForReduce incorrectly 
    assumes a single dir for mapOutIndex. (Gera Shegalov via kasha)

    MAPREDUCE-6002. Made MR task avoid reporting error to AM when the task process
    is shutting down. (Wangda Tan via zjshen)

Release 2.4.1 - 2014-06-23 

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-5830. Added back the private API HostUtil.getTaskLogUrl(..) for
    binary compatibility with older clients like Hive 0.13. (Akira Ajisaka via
    vinodkv)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-5714. Removed forceful JVM exit in shutDownJob.  
                     (Jinghui Wang via Eric Yang)

    MAPREDUCE-5818. Added "hsadmin" command into mapred.cmd. (Jian He via zjshen)

    MAPREDUCE-5824. Fixed test-failure of TestPipesNonJavaInputFormat in
    Windows. (Xuan Gong via vinodkv)

    MAPREDUCE-5815. Fixed test-failure of TestMRAppMaster by making MRAppMaster
    gracefully handle empty-queue names. (Akira Ajisaka via vinodkv)

    MAPREDUCE-5826. Fixed HistoryServerFileSystemStore to use right permissions
    on Windows for temporary files and thus also fix the test-issue with
    TestHistoryServerFileSystemStateStoreService. (Varun Vasudev via vinodkv)

    MAPREDUCE-5828. Fixed a test issue with TestMapReduceJobControl that was
    causing it to fail on Windows. (vinodkv)

    MAPREDUCE-5827. TestSpeculativeExecutionWithMRApp fails.
    (Zhijie Shen via cnauroth)

    MAPREDUCE-5833. TestRMContainerAllocator fails ocassionally.
    (Zhijie Shen via cnauroth)

    MAPREDUCE-5832. Fixed TestJobClient to not fail on JDK7 or on Windows. (Jian
    He and Vinod Kumar Vavilapalli via vinodkv)

    MAPREDUCE-5841. uber job doesn't terminate on getting mapred job kill
    (Sangjin Lee via jlowe)

    MAPREDUCE-5843. Fixed TestMRKeyValueTextInputFormat to not leak files and
    thus avoid failing on Windows. (Varun Vasudev via vinodkv)

    MAPREDUCE-5835. Killing Task might cause the job to go to ERROR state
    (Ming Ma via jlowe)

    MAPREDUCE-5821. Avoid unintentional reallocation of byte arrays in segments
    during merge. (Todd Lipcon via cdouglas)

Release 2.4.0 - 2014-04-07 

  INCOMPATIBLE CHANGES

  NEW FEATURES

    MAPREDUCE-5787. Added the ability to keep alive shuffle connections in the
    MapReduce shuffle-handler. (Rajesh Balamohan via vinodkv)

  IMPROVEMENTS

    MAPREDUCE-5464. Add analogs of the SLOTS_MILLIS counters that jive with the
    YARN resource model (Sandy Ryza)

    MAPREDUCE-5732. Report proper queue when job has been automatically placed
    (Sandy Ryza)

    MAPREDUCE-5699. Allow setting tags on MR jobs (kasha)

    MAPREDUCE-5761. Added a simple log message to denote when encrypted shuffle
    is on in the shuffle-handler. (Jian He via vinodkv) 

    MAPREDUCE-5754. Preserve Job diagnostics in history (Gera Shegalov via
    jlowe)

    MAPREDUCE-5773. Provide dedicated MRAppMaster syslog length limit (Gera
    Shegalov via jlowe)

    MAPREDUCE-5553. Allow users to easily access
    completed/pending/successful/failed tasks on MR AM web-ui. (Paul Han via
    acmurthy)

    MAPREDUCE-4052. Improved MapReduce clients to use NodeManagers' ability to
    handle cross platform application submissions. (Jian He via vinodkv)

    MAPREDUCE-2349. Modified FileInputFormat to be able to issue file and block
    location calls in parallel. (Siddharth Seth via vinodkv)

  OPTIMIZATIONS

  BUG FIXES
    
    MAPREDUCE-5746. Job diagnostics can implicate wrong task for a failed job.
    (Jason Lowe via kasha)

    MAPREDUCE-5670. CombineFileRecordReader should report progress when moving
    to the next file (Chen He via jlowe)

    MAPREDUCE-5757. ConcurrentModificationException in JobControl.toList
    (jlowe)

    MAPREDUCE-5770. Fixed MapReduce ApplicationMaster to correctly redirect
    to the YARN's web-app proxy with the correct scheme prefix. (Jian He via
    vinodkv)

    MAPREDUCE-5768. TestMRJobs.testContainerRollingLog fails on trunk (Gera
    Shegalov via jlowe)

    MAPREDUCE-5780. SliveTest should use the specified path to get the
    particular FileSystem instead of using the default FileSystem.  (szetszwo)

    MAPREDUCE-5028. Fixed a bug in MapTask that was causing mappers to fail
    when a large value of io.sort.mb is set. (Karthik Kambatla via vinodkv)

    MAPREDUCE-5778. JobSummary does not escape newlines in the job name (Akira
    AJISAKA via jlowe)

    MAPREDUCE-5789. Average Reduce time is incorrect on Job Overview page
    (Rushabh S Shah via jlowe)

    MAPREDUCE-5794. SliveMapper always uses default FileSystem. (szetszwo via
    Arpit Agarwal)

    MAPREDUCE-5751. MR app master fails to start in some cases if
    mapreduce.job.classloader is true (Sangjin Lee via jlowe)

    MAPREDUCE-5688. TestStagingCleanup fails intermittently with JDK7 (Mit
    Desai via jeagles)

    MAPREDUCE-5769. Unregistration to RM should not be called if AM is crashed
    before registering with RM (Rohith via jlowe)

    MAPREDUCE-5570. Map task attempt with fetch failure has incorrect attempt
    finish time (Rushabh S Shah via jlowe)

    MAPREDUCE-5806. Fixed a bug in MRAppMaster so as to enable users to properly
    override HADOOP_ROOT_LOGGER or HADOOP_CLIENT_OPTS. (Varun Vasudev via
    vinodkv)

    MAPREDUCE-5791. Shuffle phase is slow in Windows -
    FadviseFileRegion::transferTo does not read disks efficiently.
    (Nikola Vujic via cnauroth)

    MAPREDUCE-5795. Fixed MRAppMaster to record the correct job-state after it
    recovers from a commit during a previous attempt. (Xuan Gong via vinodkv)

    MAPREDUCE-5805. Fixed MapReduce JobHistory encoding of queue-name to escape
    hyphens and thus avoid parsing errors. (Akira AJISAKA via vinodkv)

    MAPREDUCE-5810. Removed the faulty and failing streaming test
    TestStreamingTaskLog. (Akira Ajisaka via vinodkv)

    MAPREDUCE-5813. Fix YarnChild to explicitly load job.xml from the
    local-filesystem, rather than rely on the classpath. (Gera Shegalov via
    acmurthy) 

Release 2.3.1 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES 

Release 2.3.0 - 2014-02-18

  INCOMPATIBLE CHANGES

  NEW FEATURES

    MAPREDUCE-5265. History server admin service to refresh user and superuser
    group mappings (Ashwin Shankar via jlowe)

    MAPREDUCE-5356. Ability to refresh aggregated log retention period and
    check interval (Ashwin Shankar via jlowe)

    MAPREDUCE-5386. Ability to refresh history server job retention and job
    cleaner settings (Ashwin Shankar via jlowe)

    MAPREDUCE-5411. Refresh size of loaded job cache on history server (Ashwin
    Shankar via jlowe)

    MAPREDUCE-5332. Support token-preserving restart of history server (jlowe)

  IMPROVEMENTS
  
    MAPREDUCE-5329. Allow MR applications to use additional AuxServices,
    which are compatible with the default MapReduce shuffle.
    (Avner BenHanoch via sseth)

    MAPREDUCE-5463. Deprecate SLOTS_MILLIS counters (Tzuyoshi Ozawa via Sandy
    Ryza)

    MAPREDUCE-5457. Add a KeyOnlyTextOutputReader to enable streaming to write
    out text files without separators (Sandy Ryza)

    MAPREDUCE-5596. Allow configuring the number of threads used to serve
    shuffle connections (Sandy Ryza via jlowe)

    MAPREDUCE-434. LocalJobRunner limited to single reducer (Sandy Ryza and
    Aaron Kimball via Sandy Ryza)

    MAPREDUCE-4421. Run MapReduce framework via the distributed cache (jlowe)

    MAPREDUCE-1176. FixedLengthInputFormat and FixedLengthRecordReader
    (Mariappan Asokan and BitsOfInfo via Sandy Ryza)

    MAPREDUCE-5613. DefaultSpeculator holds and checks hashmap that is always
    empty (Gera Shegalov via Sandy Ryza)

    MAPREDUCE-5431. Missing pom dependency in MR-client (Timothy St. Clair
    via stevel)

    MAPREDUCE-5624 Move grizzly-test and junit dependencies to test scope
    (Ted Yu via stevel)

    MAPREDUCE-5481. Enable uber jobs to have multiple reducers (Sandy Ryza)

    MAPREDUCE-5052. Job History UI and web services confusing job start time and
    job submit time (Chen He via jeagles)

    MAPREDUCE-5692. Add explicit diagnostics when a task attempt is killed due
    to speculative execution (Gera Shegalov via Sandy Ryza)

    MAPREDUCE-5550. Task Status message (reporter.setStatus) not shown in UI
    with Hadoop 2.0 (Gera Shegalov via Sandy Ryza)

    MAPREDUCE-3310. Custom grouping comparator cannot be set for Combiners (tucu)

    MAPREDUCE-5672. Provide optional RollingFileAppender for container log4j
    (syslog) (Gera Shegalov via jlowe)

    MAPREDUCE-5725. Make explicit that TestNetworkedJob relies on the Capacity
    Scheduler (Sandy Ryza)

    MAPREDUCE-5744. Job hangs because 
    RMContainerAllocator$AssignedRequests.preemptReduce() violates the 
    comparator contract (Gera Shegalov via kasha)

  OPTIMIZATIONS

    MAPREDUCE-4680. Job history cleaner should only check timestamps of files in
    old enough directories (Robert Kanter via Sandy Ryza)

    MAPREDUCE-5484. YarnChild unnecessarily loads job conf twice (Sandy Ryza)

    MAPREDUCE-5487. In task processes, JobConf is unnecessarily loaded again
    in Limits (Sandy Ryza)

    MAPREDUCE-5601. ShuffleHandler fadvises file regions as DONTNEED even when
    fetch fails (Sandy Ryza)

  BUG FIXES

    MAPREDUCE-5569. FloatSplitter is not generating correct splits (Nathan
    Roberts via jlowe)

    MAPREDUCE-5546. mapred.cmd on Windows set HADOOP_OPTS incorrectly (Chuan Liu
    via cnauroth)

    MAPREDUCE-5518. Fixed typo "can't read paritions file". (Albert Chu
    via devaraj)

    MAPREDUCE-5561. org.apache.hadoop.mapreduce.v2.app.job.impl.TestJobImpl
    testcase failing on trunk (Karthik Kambatla via jlowe)

    MAPREDUCE-5598. TestUserDefinedCounters.testMapReduceJob is flakey
    (Robert Kanter via jlowe)

    MAPREDUCE-5604. TestMRAMWithNonNormalizedCapabilities fails on Windows due to
    exceeding max path length. (cnauroth)

    MAPREDUCE-5451. MR uses LD_LIBRARY_PATH which doesn't mean anything in
    Windows. (Yingda Chen via cnauroth)

    MAPREDUCE-5409. MRAppMaster throws InvalidStateTransitonException: Invalid
    event: TA_TOO_MANY_FETCH_FAILURE at KILLED for TaskAttemptImpl (Gera
    Shegalov via jlowe)

    MAPREDUCE-5674. Missing start and finish time in mapred.JobStatus.
    (Chuan Liu via cnauroth)

    MAPREDUCE-5650. Job fails when hprof mapreduce.task.profile.map/reduce.params
    is specified (Gera Shegalov via Sandy Ryza)

    MAPREDUCE-5316. job -list-attempt-ids command does not handle illegal
    task-state (Ashwin Shankar via jlowe)

    MAPREDUCE-5380. Invalid mapred command should return non-zero exit code
    (Stephen Chu via jlowe)

    MAPREDUCE-5404. HSAdminServer does not use ephemeral ports in minicluster
    mode (Ted Yu via jlowe)

    MAPREDUCE-5522. Incorrect oreder expected from JobQueueInfo (Jinghui Wang
    via bobby)

    MAPREDUCE-5514. Fix TestRMContainerAllocator. (Zhijie Shen via acmurthy) 

    MAPREDUCE-5102. fix coverage org.apache.hadoop.mapreduce.lib.db and
    org.apache.hadoop.mapred.lib.db (Aleksey Gorshkov, Andrey Klochkov, and
    Nathan Roberts via jlowe)

    MAPREDUCE-5585. TestCopyCommitter#testNoCommitAction Fails on JDK7
    (jeagles)

    MAPREDUCE-5186. mapreduce.job.max.split.locations causes some splits
    created by CombineFileInputFormat to fail (Robert Parker and Jason Lowe
    via jlowe)

    MAPREDUCE-5610. TestSleepJob fails in jdk7 (Jonathan Eagles via jlowe)

    MAPREDUCE-5616. MR Client-AppMaster RPC max retries on socket timeout is too
    high. (cnauroth)

    MAPREDUCE-5625. TestFixedLengthInputFormat fails in jdk7 environment
    (Mariappan Asokan via jeagles)

    MAPREDUCE-5631. TestJobEndNotifier.testNotifyRetries fails with Should
    have taken more than 5 seconds in jdk7 (Jonathan Eagles via jlowe)

    MAPREDUCE-5645. TestFixedLengthInputFormat fails with native libs (Mit
    Desai via jeagles)

    MAPREDUCE-5632. TestRMContainerAllocator#testUpdatedNodes fails (jeagles)

    MAPREDUCE-5656. bzip2 codec can drop records when reading data in splits
    (jlowe)

    MAPREDUCE-5623. TestJobCleanup fails because of RejectedExecutionException
    and NPE. (jlowe)

    MAPREDUCE-5679. TestJobHistoryParsing has race condition (Liyin Liang via
    jlowe)

    MAPREDUCE-5687. Fixed failure in TestYARNRunner caused by YARN-1446. (Jian He
    via vinodkv)

    MAPREDUCE-5694. Fixed MR AppMaster to shutdown the LogManager so as to avoid
    losing syslog in some conditions. (Mohammad Kamrul Islam via vinodkv)

    MAPREDUCE-5685. Fixed a bug with JobContext getCacheFiles API inside the
    WrappedReducer class. (Yi Song via vinodkv)

    MAPREDUCE-5689. MRAppMaster does not preempt reducers when scheduled maps 
    cannot be fulfilled. (lohit via kasha)

    MAPREDUCE-5724. JobHistoryServer does not start if HDFS is not running. 
    (tucu)

    MAPREDUCE-5729. mapred job -list throws NPE (kasha)

    MAPREDUCE-5693. Restore MRv1 behavior for log flush (Gera Shegalov via
    jlowe)

    MAPREDUCE-5723. MR AM container log can be truncated or empty.
    (Mohammad Kamrul Islam via kasha)

    MAPREDUCE-5743. Fixed the test failure in TestRMContainerAllocator.
    (Ted Yu and Vinod Kumar Vavilapalli via zjshen)

Release 2.2.0 - 2013-10-13

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-5504. mapred queue -info inconsistent with types (Kousuke Saruta
    via tgraves)

    MAPREDUCE-5488. Changed MR client to keep trying to reach the application
    when it sees that on attempt's AM is down. (Jian He via vinodkv)

    MAPREDUCE-5515. Fixed MR AM's webapp to depend on a new config
    mapreduce.ssl.enabled to enable https and disabling it by default as MR AM
    needs to set up its own certificates etc and not depend on clusters'.
    (Omkar Vinit Joshi via vinodkv)

    MAPREDUCE-5505. Clients should be notified job finished only after job
    successfully unregistered (Zhijie Shen via bikas)

    MAPREDUCE-5503. Fixed a test issue in TestMRJobClient. (Jian He via vinodkv)

    MAPREDUCE-5170. Fixed a wrong log message in CombineFileInputFormat class.
    (Sangjin Lee via vinodkv)

    MAPREDUCE-5525. Increase timeout of TestDFSIO.testAppend and
    TestMRJobsWithHistoryService.testJobHistoryData. (Chuan Liu via cnauroth)

    MAPREDUCE-5513. ConcurrentModificationException in JobControl (Robert
    Parker via jlowe)

    MAPREDUCE-5531. Fix compat with hadoop-1 in mapreduce.(TaskID,
    TaskAttemptID) by re-introducing missing constructors. (Robert Kanter via
    acmurthy)

    MAPREDUCE-5545. org.apache.hadoop.mapred.TestTaskAttemptListenerImpl.testCommitWindow
    times out (Robert Kanter via jlowe)

    MAPREDUCE-5529. Fix compat with hadoop-1 in mapred.TotalOrderPartitioner
    by re-introducing (get,set)PartitionFile which takes in JobConf. (Robert 
    Kanter via acmurthy)

    MAPREDUCE-5538. Fixed MR AppMaster to send job-notification URL only after
    the job is really done - a bug caused by MAPREDUCE-5505. (Zhijie Shen via
    vinodkv)

    MAPREDUCE-5551. Fix compat with hadoop-1 in
    SequenceFileAsBinaryOutputFormat.WritableValueBytes by re-introducing
    missing constructors. (Zhijie Shen via acmurthy)

    MAPREDUCE-5544. JobClient#getJob loads job conf twice. (Sandy Ryza)

    MAPREDUCE-5536. Fixed MR AM and JHS to respect
    mapreduce.jobhistory.webapp.https.address. (Omkar Vinit Joshi via vinodkv)

    MAPREDUCE-5530. Fix compat with hadoop-1 in
    mapred.lib.CombinFileInputFormat by re-introducing
    isSplittable(FileSystem, Path) api and ensuring semantic compatibility.
    (Robert Kanter via acmurthy)

    MAPREDUCE-5459. Update documentation on how to run MRv1 examples on YARN.
    (Zhijie Shen via acmurthy)

    MAPREDUCE-5554. hdfs-site.xml included in hadoop-mapreduce-client-jobclient
    tests jar is breaking tests for downstream components (Robert Kanter via
    Sandy Ryza)

    MAPREDUCE-5489. MR jobs hangs as it does not use the node-blacklisting
    feature in RM requests (Zhijie Shen via bikas)

    MAPREDUCE-5442. $HADOOP_MAPRED_HOME/$HADOOP_CONF_DIR setting not working on
    Windows. (Yingda Chen via cnauroth)

    MAPREDUCE-5533. Fixed MR speculation code to track any TaskAttempts that
    aren't heart-beating for a while, so that we can aggressively speculate
    instead of waiting for task-timeout (Xuan Gong via vinodkv)

    MAPREDUCE-5562. Fixed MR App Master to perform pending tasks like staging-dir
    cleanup, sending job-end notification correctly when unregister with RM
    fails. (Zhijie Shen via vinodkv)

Release 2.1.1-beta - 2013-09-23

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-5478. TeraInputFormat unnecessarily defines its own FileSplit
    subclass (Sandy Ryza)

    MAPREDUCE-5497. Changed MRAppMaster to sleep only after doing everything else
    but just before ClientService to avoid race conditions during RM restart.
    (Jian He via vinodkv)

    MAPREDUCE-5379. Include token tracking ids in jobconf. (kkambatl via tucu)

    MAPREDUCE-5523. Added separate configuration properties for https for JHS 
    without which even when https is enabled, it starts on http port itself.
    (Omkar Vinit Joshi via vinodkv)

  OPTIMIZATIONS

    MAPREDUCE-5446. TestJobHistoryEvents and TestJobHistoryParsing have race
    conditions (jlowe via kihwal)

    MAPREDUCE-5462. In map-side sort, swap entire meta entries instead of
    indexes for better cache performance. (Sandy Ryza)

    MAPREDUCE-1981. Improve getSplits performance by using listLocatedStatus
    (Hairong Kuang and Jason Lowe via jlowe)

  BUG FIXES

    MAPREDUCE-5385. Fixed a bug with JobContext getCacheFiles API. (Omkar Vinit
    Joshi via vinodkv)

    MAPREDUCE-5428.  HistoryFileManager doesn't stop threads when service is
    stopped (Karthik Kambatla via jlowe)

    MAPREDUCE-5251. Reducer should not implicate map attempt if it has
    insufficient space to fetch map output (Ashwin Shankar via jlowe)

    MAPREDUCE-5317. Stale files left behind for failed jobs (Ravi Prakash via
    jlowe)

    MAPREDUCE-5358. MRAppMaster throws invalid transitions for JobImpl
    (Devaraj K via jlowe)

    MAPREDUCE-3193. FileInputFormat doesn't read files recursively in the
    input path dir (Devaraj K via jlowe)

    MAPREDUCE-5440. TestCopyCommitter Fails on JDK7 (Robert Parker via jlowe)

    MAPREDUCE-5367. Local jobs all use same local working directory
    (Sandy Ryza)

    MAPREDUCE-5425. Junit in TestJobHistoryServer failing in jdk 7 (Robert
    Parker via jlowe)

    MAPREDUCE-5454. TestDFSIO fails intermittently on JDK7 (Karthik Kambatla
    via Sandy Ryza)

    MAPREDUCE-5001. LocalJobRunner has race condition resulting in job
    failures (Sandy Ryza via jlowe)

    MAPREDUCE-5466. Changed MR AM to not promote history files of intermediate
    AMs in case they are exiting because of errors and thus help history-server
    pick up the right history file for the last successful AM. (Jian He via
    vinodkv)

    MAPREDUCE-5468. Fix MR AM recovery for map-only jobs. (vinodkv via
    acmurthy)

    MAPREDUCE-5470. LocalJobRunner does not work on Windows. (Sandy Ryza via
    cnauroth)

    MAPREDUCE-5476. Changed MR AM recovery code to cleanup staging-directory
    only after unregistering from the RM. (Jian He via vinodkv)

    MAPREDUCE-5483. revert MAPREDUCE-5357. (rkanter via tucu)

    MAPREDUCE-5441. Changed MR AM to return RUNNING state if exiting when RM
    commands to reboot, so that client can continue to track the overall job.
    (Jian He via vinodkv)

    MAPREDUCE-5475. MRClientService does not verify ACLs properly (jlowe)

    MAPREDUCE-5414. TestTaskAttempt fails in JDK7 with NPE (Nemon Lou via 
    devaraj)

    MAPREDUCE-5020. Compile failure with JDK8 (Trevor Robinson via tgraves)

    MAPREDUCE-5164. mapred job and queue commands omit HADOOP_CLIENT_OPTS 
    (Nemon Lou via devaraj)

    MAPREDUCE-5493. Cleanup in-memory & on-disk segments to prevent leak on
    shuffle completion. (jlowe via acmurthy)

Release 2.1.0-beta - 2013-08-22

  INCOMPATIBLE CHANGES

    MAPREDUCE-4067. Changed MRClientProtocol api to throw IOException only (Xuan
    Gong via vinodkv)

    MAPREDUCE-5234. Change mapred.TaskReport and mapreduce.TaskReport for binary
    compatibility with mapred in 1.x but incompatible with 0.23.x. (Mayank Bansal
    via vinodkv)

    MAPREDUCE-5156. Change hadoop examples ProgramDriver to be able to run
    1.x examples jar on top of YARN. This change breaks 0.23.x direct usages of
    ProgramDriver. (Zhijie Shen via vinodkv)

    MAPREDUCE-5233. Add methods that are changed or removed from JobControl.Job
    when compared to 1.x. This breaks 0.23.x users of one API in Job. (Mayank
    Bansal via vinodkv)

    MAPREDUCE-5237. Add methods that were removed from ClusterStatus back into
    2.x so as to be compatible with 1.x. Incompatible as
    ClusterStatus.UNINITIALIZED_MEMORY_VALUE is a long now and so breaks 0.23.x
    but it shouldn't be a big deal in reality. (Zhijie Shen via vinodkv)

  NEW FEATURES

    HADOOP-8562. Enhancements to support Hadoop on Windows Server and Windows
    Azure environments. (See breakdown of tasks below for subtasks and
    contributors)

  IMPROVEMENTS

    MAPREDUCE-3008. Improvements to cumulative CPU emulation for short running
    tasks in Gridmix. (amarrk via tgraves)

    MAPREDUCE-5033. mapred shell script should respect usage flags
    (--help -help -h). (Andrew Wang via atm)

    MAPREDUCE-4892. Modify CombineFileInputFormat to not skew input slits'
    allocation on small clusters. (Bikas Saha via vinodkv)

    MAPREDUCE-4990. Construct debug strings conditionally in 
    ShuffleHandler.Shuffle#sendMapOutput(). (kkambatl via tucu)

    MAPREDUCE-4875. coverage fixing for org.apache.hadoop.mapred 
    (Aleksey Gorshkov via bobby)

    MAPREDUCE-5129. Allow tags to JobHistory for deeper analytics. (billie via
    acmurthy)

    MAPREDUCE-3787. [Gridmix] Optimize job monitoring and STRESS mode for
    faster job submission. (amarrk via tgraves)

    MAPREDUCE-5079. Changes job recovery to restore state directly from job
    history, instaed of simulating state machine events.
    (Jason Lowe and Robert Parker via sseth)

    MAPREDUCE-4981. Add WordMean, WordMedian, WordStandardDeviation
    to ExamplesDriver. (Plamen Jeliazkov via shv)

    MAPREUDUCE-5059. Change average merge time on Job overview page to be the
    time delta between the end of the shuffle and the start of the reduce.
    (Omkar Vinit Joshi via vinodkv)

    MAPREDUCE-4985. Add compression option to TestDFSIO usage.
    (Plamen Jeliazkov via shv)

    MAPREDUCE-5152. Make MR App to simply pass through the container from RM
    instead of extracting and populating information itself to start any
    container. (vinodkv)

    MAPREDUCE-5175. Updated MR App to not set envs that will be set by NMs
    anyways after YARN-561. (Xuan Gong via vinodkv)

    MAPREDUCE-5069. add concrete common implementations of
    CombineFileInputFormat (Sangjin Lee via bobby)

    MAPREDUCE-5145. Changed default max-attempts to be more than one for MR jobs
    inline with YARN. (Zhijie Shen via vinodkv)

    MAPREDUCE-5036. Default shuffle handler port should not be 8080.
    (Sandy Ryza via tomwhite)

    MAPREDUCE-5159. Change ValueAggregatorJob to add APIs which can support
    binary compatibility with hadoop-1 examples. (Zhijie Shen via vinodkv)

    MAPREDUCE-5157. Bring back old sampler related code so that we can support
    binary compatibility with hadoop-1 sorter example. (Zhijie Shen via vinodkv)

    MAPREDUCE-5222. Bring back some methods and constants in Jobclient for
    binary compatibility with mapred in 1.x. (Karthik Kambatla via vinodkv)

    MAPREDUCE-5235. Bring back old fields and exceptions in Counters for
    binary compatibility with mapred in 1.x. (Mayank Bansal via vinodkv)

    MAPREDUCE-5246. Specify application-type at the time of job submission after
    YARN-563. (Mayank Bansal via vinodkv)

    MAPREDUCE-5230. Bring back NLineInputFormat.createFileSplit for binary
    compatibility with mapred in 1.x (Mayank Bansal via vinodkv)

    MAPREDUCE-5270. Migrated MR app from using BuilderUtil factory methods to
    individual record factory methods. (Jian He via vinodkv)

    MAPREDUCE-5263. Bring back old methods and fields in
    filecache.DistributedCache for binary compatibility with mapred in 1.x.
    (Zhijie Shen via vinodkv)

    MAPREDUCE-5228. Bring back FileInputFormat.Counter and
    FileOuputFormat.Counter for binary compatibility with 1.x mapred APIs.
    (Mayank Bansal via vinodkv)

    MAPREDUCE-5176. Add annotation for tagging tasks as responsive to
    preemption. (Carlo Curino, cdouglas)

    MAPREDUCE-5275. Bring back a couple of APIs in mapreduce.security.TokenCache
    for binary compatibility with 1.x mapreduce APIs. (Mayank Bansal via vinodkv)

    MAPREDUCE-5231. Bring back a constructor in mapred's
    DBInputFormat.DBRecordReader for binary compatibility with 1.x mapred APIs.
    (Zhijie Shen via vinodkv)

    MAPREDUCE-5273. Bring back a couple of protected variables in mapred and
    mapreduce CombineFileRecordReader for binary compatibility with 1.x APIs.
    (Mayank Bansal via vinodkv)

    MAPREDUCE-5280. Bring back removed constructor and a method in mapreduce
    ClusterMetrics for binary compatibility with 1.x APIs. (Mayank Bansal via
    vinodkv)

    MAPREDUCE-5289. Updated MR App to use Token directly after YARN-717. (Jian He
    via vinodkv)

    MAPREDUCE-5229. Put back FileOutputCommitter.TEMP_DIR_NAME in mapreduce for
    binary compatibility with 1.x APIs. (Zhijie Shen via vinodkv)

    MAPREDUCE-5274. Bring back SecureShuffleUtils.toHex in mapreduce for binary
    compatibility with 1.x APIs. (Mayank Bansal via vinodkv)

    MAPREDUCE-5300. Fix backward incompatibility for
    o.a.h.mapreduce.filecache.DistributedCache. (Zhijie Shen via acmurthy)

    MAPREDUCE-5283. Over 10 different tests have near identical
    implementations of AppContext (Sandy Ryza via jlowe)

    MAPREDUCE-5199. Removing ApplicationTokens file as it is no longer needed.
    (Daryn Sharp via vinodkv)

    MAPREDUCE-5192. Allow for alternate resolutions of TaskCompletionEvents.
    (cdouglas via acmurthy)

    MAPREDUCE-5184. Document compatibility for MapReduce applications in
    hadoop-2 vis-a-vis hadoop-1. (Zhijie Shen via acmurthy)

    MAPREDUCE-5194. Heed interrupts during Fetcher shutdown. (cdouglas)

    MAPREDUCE-5326. Added version to shuffle header. (Zhijie Shen via
    acmurthy)

    MAPREDUCE-5333. Add test that verifies MRAM works correctly when sending
    requests with non-normalized capabilities. (ywskycn via tucu)

    MAPREDUCE-5398. MR changes for YARN-513 (Jian He via bikas)

  OPTIMIZATIONS

    MAPREDUCE-4974. Optimising the LineRecordReader initialize() method 
    (Gelesh via bobby)

    MAPREDUCE-5268. Improve history server startup performance (Karthik
    Kambatla via jlowe)

    MAPREDUCE-5352. Optimize node local splits generated by
    CombineFileInputFormat. (sseth)

  BUG FIXES

    MAPREDUCE-4671. AM does not tell the RM about container requests which are
    no longer needed. (Bikas Saha via sseth)

    MAPREDUCE-4994. -jt generic command line option does not work. (sandyr via tucu)

    MAPREDUCE-5000. Fixes getCounters when speculating by fixing the selection
    of the best attempt for a task. (Jason Lowe via sseth)

    MAPREDUCE-4994. Addendum fixing testcases failures. (sandyr via tucu)

    MAPREDUCE-4846. Some JobQueueInfo methods are public in MR1 but protected
    in MR2. (Sandy Ryza via tomwhite)

    MAPREDUCE-5013. mapred.JobStatus compatibility: MR2 missing constructors
    from MR1. (Sandy Ryza via tomwhite)

    MAPREDUCE-4951. Container preemption interpreted as task failure.
    (Sandy Ryza via tomwhite)

    MAPREDUCE-5008. Merger progress miscounts with respect to EOF_MARKER.
    (Sandy Ryza via tomwhite)

    MAPREDUCE-4693. History server should include counters for failed tasks.
    (Xuan Gong via sseth)

    MAPREDUCE-4896. mapred queue -info spits out ugly exception when queue does 
    not exist. (sandyr via tucu)

    MAPREDUCE-3685. Fix bugs in MergeManager to ensure compression codec is
    appropriately used and that on-disk segments are correctly sorted on
    file-size. (Anty Rao and Ravi Prakash via acmurthy) 

    MAPREDUCE-4571. TestHsWebServicesJobs fails on jdk7. (tgraves via tucu)

    MAPREDUCE-4716. TestHsWebServicesJobsQuery.testJobsQueryStateInvalid 
    fails with jdk7. (tgraves via tucu)

    MAPREDUCE-5075. DistCp leaks input file handles since ThrottledInputStream
    does not close the wrapped InputStream.  (Chris Nauroth via szetszwo)

    MAPREDUCE-3872. Fix an event handling races in ContainerLauncherImpl.
    (Robert Kanter via sseth)

    MAPREDUCE-5062. Fix MR AM to read max-retries from the RM. (Zhijie Shen via
    vinodkv)

    MAPREDUCE-3829. [Gridmix] Gridmix should give better error message when
    input data directory already exists and -generate opton is
    given.(ravigummadi via tgraves)

    MAPREDUCE-2722. [Gridmix] Gridmix simulated job's map's hdfsBytesRead
    counter is wrong when compressed input is used.(ravigummadi via tgraves)

    MAPREDUCE-3953. [Gridmix] Gridmix throws NPE and does not simulate a
    job if the trace contains null taskStatus for a task.  (ravigummadi via 
    tgraves)

    MAPREDUCE-4087. [Gridmix] GenerateDistCacheData job of Gridmix can
    become slow in some cases (ravigummadi via tgraves).

    MAPREDUCE-5077. Remove mapreduce.util.ResourceCalculatorPlugin and related
    code. (Karthik Kambatla via sseth)

    MAPREDUCE-4083. [Gridmix] NPE in cpu emulation. (amarrk via tgraves)

    MAPREDUCE-4100. [Gridmix] Bug fixed in compression emulation feature for 
    map only jobs. (amarrk via tgraves)

    MAPREDUCE-4356. [Rumen] Provide access to the method
    ParsedTask.obtainTaskAttempts(). (ravigummadi via tgraves)

    MAPREDUCE-4149. [Rumen] Rumen fails to parse certain counter
    strings. (ravigummadi via tgraves) 

    MAPREDUCE-3757. [Rumen] Fixed Rumen Folder to adjust shuffleFinished and
    sortFinished times when needed. (Ravi Gummadi via tgraves)

    MAPREDUCE-5138. Fix LocalDistributedCacheManager after YARN-112. (Omkar Vinit
    Joshi via vinodkv)

    MAPREDUCE-5086. MR app master deletes staging dir when sent a reboot
    command from the RM. (Jian He via jlowe)

    MAPREDUCE-5113. Streaming input/output types are ignored with java
    mapper/reducer. (sandyr via tucu)

    MAPREDUCE-5098. Fix findbugs warnings in gridmix. (kkambatl via tucu)

    MAPREDUCE-5137. AM web UI: clicking on Map Task results in 500 error
    (Thomas Graves via jlowe)

    MAPREDUCE-5136. TestJobImpl->testJobNoTasks fails with IBM JAVA (Amir
    Sanjar via jlowe)

    MAPREDUCE-5139. Update MR AM to use the modified startContainer API after
    YARN-486. (Xuan Gong via vinodkv)

    MAPREDUCE-5151. Update MR AM to use standard exit codes from the API after
    YARN-444. (Sandy Ryza via vinodkv)

    MAPREDUCE-5140. MR part of YARN-514 (Zhijie Shen via bikas)

    MAPREDUCE-5128. mapred-default.xml is missing a bunch of history server 
    configs. (sandyr via tucu)

    MAPREDUCE-4898. FileOutputFormat.checkOutputSpecs and 
    FileOutputFormat.setOutputPath incompatible with MR1. (rkanter via tucu)
    
    MAPREDUCE-5078. TestMRAppMaster fails on Windows due to mismatched path
    separators. (Chris Nauroth via sseth)

    MAPREDUCE-4932. mapreduce.job#getTaskCompletionEvents incompatible with 
    Hadoop 1. (rkanter via tucu)

    MAPREDUCE-5163. Update MR App to not use API utility methods for collections
    after YARN-441. (Xuan Gong via vinodkv)

    MAPREDUCE-5066. Added a timeout for the job.end.notification.url. (Ivan
    Mitic via acmurthy)

    MAPREDUCE-5146. application classloader may be used too early to load
    classes. (Sangjin Lee via tomwhite)

    MAPREDUCE-4737. Ensure that mapreduce APIs are semantically consistent
    with mapred API w.r.t Mapper.cleanup and Reducer.cleanup; in the sense that
    cleanup is now called even if there is an error. The old mapred API
    already ensures that Mapper.close and Reducer.close are invoked during
    error handling. Note that it is an incompatible change, however end-users 
    can override Mapper.run and Reducer.run to get the old (inconsistent) 
    behaviour. (acmurthy)

    MAPREDUCE-5166. Fix ConcurrentModificationException due to insufficient
    synchronization on updates to task Counters. (Sandy Ryza via acmurthy)

    MAPREDUCE-5181. RMCommunicator should not use AMToken from the env.
    (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-5178. Update MR App to set progress in ApplicationReport after
    YARN-577. (Hitesh Shah via vinodkv)

    MAPREDUCE-5167. Update MR App after YARN-562 to use the new builder API
    for the container. (Jian He via vinodkv)

    MAPREDUCE-5179. Fix unit test in TestHSWebServices which fails when
    versionInfo has parantheses like when running on a git checkout. (Hitesh Shah
    via vinodkv)

    MAPREDUCE-5193. A few MR tests use block sizes which are smaller than the
    default minimum block size. (Andrew Wang via atm)

    MAPREDUCE-5205. Fixed MR App to load tokens correctly. (vinodkv)

    MAPREDUCE-5204. Handling YarnRemoteException separately from IOException in
    MR app after YARN-629. (Xuan Gong via vinodkv)

    MAPREDUCE-5209. Fix units in a ShuffleScheduler log message.
    (Tsuyoshi OZAWA via cdouglas)

    MAPREDUCE-5212. Handling YarnRemoteException separately from IOException in
    MR App's use of ClientRMProtocol after YARN-631. (Xuan Gong via vinodkv)

    MAPREDUCE-5226. Handling YarnRemoteException separately from IOException in
    MR App's use of AMRMProtocol after YARN-630. (Xuan Gong via vinodkv)

    MAPREDUCE-4942. mapreduce.Job has a bunch of methods that throw 
    InterruptedException so its incompatible with MR1. (rkanter via tucu)

    MAPREDUCE-5239. Updated MR App to reflect YarnRemoteException changes after
    YARN-634. (Siddharth Seth via vinodkv)

    MAPREDUCE-5208. Modified ShuffleHandler to use SecureIOUtils for reading
    local files. (Omkar Vinit Joshi via vinodkv)

    MAPREDUCE-5220. Setter methods in TaskCompletionEvent are public in MR1 and 
    protected in MR2. (sandyr via tucu)

    MAPREDUCE-5240. Fix a bug in MRAppMaster because of which OutputCommitter
    could not access credentials set by the user. (vinodkv)

    MAPREDUCE-5244. Two functions changed their visibility in JobStatus. 
    (zjshen via tucu)

    MAPREDUCE-4927. Historyserver 500 error due to NPE when accessing specific
    counters page for failed job. (Ashwin Shankar via jlowe)

    MAPREDUCE-5257. Fix issues in TestContainerLauncherImpl after YARN-617.
    (Omkar Vinit Joshi via vinodkv)

    MAPREDUCE-5282. Updating MR App to use immutable ApplicationID after
    YARN-716. (Siddharth Seth via vinodkv)

    MAPREDUCE-5286. Change MapReduce to use ContainerTokenIdentifier instead
    of the entire Container in the startContainer call - YARN-684.
    (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-5299. Fix backward incompatibility for TaskCompletionEvent by
    adding back setTaskID. (Zhijie Shen via acmurthy) 

    MAPREDUCE-5296. Fix backward incompatibility for JobControl by adding the
    omitted addJob. (Zhijie Shen via acmurthy) 

    MAPREDUCE-5245. Added back constants to JobConf to fix incompatibilities.  
    (Zhijie Shen via acmurthy) 

    MAPREDUCE-5297. Updated MR App since BuilderUtils is no longer public
    after YARN-748. (Jian He via vinodkv)

    MAPREDUCE-5301. Updated MR code to work with YARN-635 changes of renaming
    YarnRemoteException to YarnException. (Siddharth Seth via vinodkv)

    MAPREDUCE-5308. Shuffling to memory can get out-of-sync when fetching
    multiple compressed map outputs (Nathan Roberts via jlowe)

    MAPREDUCE-5315.  DistCp reports success even on failure. (mithun and jlowe
    via daryn)

    MAPREDUCE-5259. TestTaskLog fails on Windows because of path separators
    missmatch. (Ivan Mitic via cnauroth)

    MAPREDUCE-4019. -list-attempt-ids is not working (Ashwin Shankar,
    Devaraj K, and B Anil Kumar via jlowe)

    MAPREDUCE-5334. Fix failing unit tests - TestContainerLauncher,
    TestContainerLauncherImpl. (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-5325. MR changes related to YARN-727. ClientRMProtocol.getAllApplications
    should accept ApplicationType as a parameter. (Xuan Gong via hitesh)

    MAPREDUCE-5291. Change MR App to use updated property names in
    container-log4j.properties. (Zhijie Shen via sseth)

    MAPREDUCE-5303. Changed MR app after moving ProtoBase to package impl.pb via
    YARN-724. (Jian He via vinodkv)

    MAPREDUCE-5312. TestRMNMInfo is failing. (sandyr via tucu)

    MAPREDUCE-5304. mapreduce.Job killTask/failTask/getTaskCompletionEvents 
    methods have incompatible signature changes. (kkambatl via tucu)

    MAPREDUCE-5298. Moved MapReduce services to YARN-530 stricter lifecycle.
    (Steve Loughran via vinodkv)

    MAPREDUCE-5319. Set user.name in job.xml. (Xuan Gong via acmurthy)

    MAPREDUCE-5310. MRAM should not normalize allocation request capabilities.
    (tucu)

    MAPREDUCE-5213. Re-assess TokenCache methods marked @Private. 
    (kkambatl via tucu)

    MAPREDUCE-5412. Update MR app to use multiple containers API of
    ContainerManager after YARN-926. (Jian He via vinodkv)

    MAPREDUCE-5421. Fixed TestNonExistentJob failure after YARN-873. (Junping Du
    via vinodkv)

    MAPREDUCE-5419. TestSlive is getting FileNotFound Exception (Robert Parker
    via jlowe)

    MAPREDUCE-5399. Unnecessary Configuration instantiation in IFileInputStream
    slows down merge. (Stanislav Barton via Sandy Ryza)

  BREAKDOWN OF HADOOP-8562 SUBTASKS

    MAPREDUCE-4739. Some MapReduce tests fail to find winutils.
    (Chris Nauroth via suresh)

    MAPREDUCE-4780. MapReduce distribution build fails on Windows.
    (Chris Nauroth via suresh)

    MAPREDUCE-4790. MapReduce build script would be more readable using abspath.
    (Chris Nauroth via suresh)

    MAPREDUCE-4869. Fix TestMapReduceChildJVM. (Chris Nauroth via acmurthy)

    MAPREDUCE-4870. Fix TestMRJobsWithHistoryService. (Chris Nauroth via acmurthy)

    MAPREDUCE-4983. Fixed various platform specific assumptions in various tests,
    so that they can pass on Windows too. (Chris Nauroth via vinodkv)

    HADOOP-9372. Fix bad timeout annotations on tests.
    (Arpit Agarwal via suresh)

    MAPREDUCE-4885. Streaming tests have multiple failures on Windows. (Chris
    Nauroth via bikas)

    MAPREDUCE-5177. Use common utils FileUtil#setReadable/Writable/Executable & 
    FileUtil#canRead/Write/Execute. (Ivan Mitic via suresh)

    MAPREDUCE-5349. TestClusterMapReduceTestCase and TestJobName fail on Windows
    in branch-2. (Chuan Liu via cnauroth)

    MAPREDUCE-5355. MiniMRYarnCluster with localFs does not work on Windows.
    (Chuan Liu via cnauroth)

    MAPREDUCE-5359. JobHistory should not use File.separator to match timestamp
    in path. (Chuan Liu via cnauroth)

    MAPREDUCE-5357. Job staging directory owner checking could fail on Windows.
    (Chuan Liu via cnauroth)

    MAPREDUCE-5360. TestMRJobClient fails on Windows due to path format.
    (Chuan Liu via cnauroth)

    MAPREDUCE-5366. TestMRAsyncDiskService fails on Windows. (Chuan Liu via
    cnauroth)

    MAPREDUCE-5187. Create mapreduce command scripts on Windows. (Chuan Liu via
    cnauroth)

    MAPREDUCE-4374. Fix child task environment variable config and add support
    for Windows. (Chuan Liu via cnauroth)

Release 2.0.6-alpha - 08/22/2013

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

Release 2.0.5-alpha - 06/06/2013

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

  MAPREDUCE-5240 inside of FileOutputCommitter the initialized Credentials cache
  appears to be empty. (vinodkv)

Release 2.0.4-alpha - 2013-04-25

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-5006. Fix failing streaming tests due to MAPREDUCE-4994.
    (Sandy Ryza via tomwhite)

    MAPREDUCE-5088. MR Client gets an renewer token exception while Oozie is
    submitting a job (Daryn Sharp via cos)

    MAPREDUCE-5117. Changed MRClientProtocolPBClientImpl to be closeable and thus
    fix failures in renewal of HistoryServer's delegations tokens. (Siddharth
    Seth via vinodkv)

    MAPREDUCE-5083. MiniMRCluster should use a random component when creating an
    actual cluster (Siddharth Seth via hitesh)

    MAPREDUCE-5094. Disabled memory monitoring by default in MiniMRYarnCluster
    to avoid some downstream tests failing. (Siddharth Seth via vinodkv)

Release 2.0.3-alpha - 2013-02-06 

  INCOMPATIBLE CHANGES

    MAPREDUCE-4123. Remove the 'mapred groups' command, which is no longer
    supported. (Devaraj K via sseth)

    MAPREDUCE-4938. Use token request messages defined in hadoop common.
    (suresh)

  NEW FEATURES

    MAPREDUCE-4520. Added support for MapReduce applications to request for
    CPU cores along-with memory post YARN-2. (acmurthy)

    MAPREDUCE-4810. Added new admin command options for MR AM. (Jerry Chen via
    vinodkv)

    MAPREDUCE-4049. Experimental api to allow for alternate shuffle plugins.
    (Avner BenHanoch via acmurthy) 

    MAPREDUCE-4807. Allow MapOutputBuffer to be pluggable. (masokan via tucu)

    MAPREDUCE-4808. Refactor MapOutput and MergeManager to facilitate reuse 
    by Shuffle implementations. (masokan via tucu)

  IMPROVEMENTS

    MAPREDUCE-3678. The Map tasks logs should have the value of input
    split it processed. (harsh)

    MAPREDUCE-4616. Improve javadoc for MultipleOutputs. (Tony Burton via
    acmurthy) 

    HADOOP-8911. CRLF characters in source and text files.
    (Raja Aluri via suresh)

    MAPREDUCE-4723. Fix warnings found by findbugs 2. (Sandy Ryza via eli)

    MAPREDUCE-4703. Add the ability to start the MiniMRClientCluster using 
    the configurations used before it is being stopped. (ahmed.radwan via tucu)

    MAPREDUCE-4845. ClusterStatus.getMaxMemory() and getUsedMemory() exist in
    MR1 but not MR2. (Sandy Ryza via tomwhite)

    MAPREDUCE-4899. Implemented a MR specific plugin for tracking finished
    applications that YARN's ResourceManager doesn't keep track off anymore
    (Derek Dagit via vinodkv)

    MAPREDUCE-4920. Use security token protobuf definition from hadoop common.
    (Suresh Srinivas via vinodkv)

    MAPREDUCE-4907. TrackerDistributedCacheManager issues too many getFileStatus
    calls. (sandyr via tucu)

    MAPREDUCE-4949. Enable multiple pi jobs to run in parallel. (sandyr via tucu)

    MAPREDUCE-4809. Change visibility of classes for pluggable sort changes. 
    (masokan via tucu)

    MAPREDUCE-4838. Add additional fields like Locality, Avataar to the
    JobHistory logs. (Zhijie Shen via sseth)

    MAPREDUCE-4971. Minor extensibility enhancements to Counters & 
    FileOutputFormat. (Arun C Murthy via sseth)

    MAPREDUCE-4977. Documentation for pluggable shuffle and pluggable sort. 
    (tucu)

  OPTIMIZATIONS

    MAPREDUCE-4893. Fixed MR ApplicationMaster to do optimal assignment of
    containers to get maximum locality. (Bikas Saha via vinodkv)

  BUG FIXES

    MAPREDUCE-4272. SortedRanges.Range#compareTo is not spec compliant.
    (Yu Gao via llu)

    MAPREDUCE-4607. Race condition in ReduceTask completion can result in Task
    being incorrectly failed. (Bikas Saha via tomwhite)

    MAPREDUCE-4646. Fixed MR framework to send diagnostic information correctly
    to clients in case of failed jobs also. (Jason Lowe via vinodkv)

    MAPREDUCE-4674. Hadoop examples secondarysort has a typo
    "secondarysrot" in the usage. (Robert Justice via eli)

    MAPREDUCE-4681. Fix unit tests broken by HDFS-3910. (acmurthy) 

    MAPREDUCE-4712. mr-jobhistory-daemon.sh doesn't accept --config
    (Vinod Kumar Vavilapalli via tgraves)

    MAPREDUCE-4654. TestDistCp is ignored. (Sandy Ryza via tomwhite)

    MAPREDUCE-4637. Handle TaskAttempt diagnostic updates while in the NEW and 
    UNASSIGNED states. (Mayank Bansal via sseth)

    MAPREDUCE-1806. CombineFileInputFormat does not work with paths not on default FS. (Gera Shegalov via tucu)

    MAPREDUCE-4777. In TestIFile, testIFileReaderWithCodec relies on
    testIFileWriterWithCodec. (Sandy Ryza via tomwhite)

    MAPREDUCE-4800. Cleanup o.a.h.mapred.MapTaskStatus - remove unused 
    code. (kkambatl via tucu)

    MAPREDUCE-4861. Cleanup: Remove unused mapreduce.security.token.DelegationTokenRenewal. 
    (kkambatl via tucu)

    MAPREDUCE-4856. TestJobOutputCommitter uses same directory as
    TestJobCleanup. (Sandy Ryza via tomwhite)

    MAPREDUCE-4895. Fix compilation failure of org.apache.hadoop.mapred.
    gridmix.TestResourceUsageEmulators (Dennis Y via tgraves)

    MAPREDUCE-4278. Cannot run two local jobs in parallel from the same
    gateway. (Sandy Ryza via tomwhite)

    MAPREDUCE-1700. User supplied dependencies may conflict with MapReduce
    system JARs. (tomwhite)

    MAPREDUCE-4936. JobImpl uber checks for cpu are wrong (Arun C Murthy via
    jlowe)

    MAPREDUCE-4924. flakey test: org.apache.hadoop.mapred.TestClusterMRNotification.testMR. 
    (rkanter via tucu)

    MAPREDUCE-4923. Add toString method to TaggedInputSplit. (sandyr via tucu)

    MAPREDUCE-4948. Fix a failing unit test TestYARNRunner.testHistoryServerToken.
    (Junping Du via sseth)

    MAPREDUCE-4803. Remove duplicate copy of TestIndexCache. (Mariappan Asokan
    via sseth)

    MAPREDUCE-2264. Job status exceeds 100% in some cases. 
    (devaraj.k and sandyr via tucu)

    MAPREDUCE-4969. TestKeyValueTextInputFormat test fails with Open JDK 7.
    (Arpit Agarwal via suresh)

    MAPREDUCE-4884. Streaming tests fail to start MiniMRCluster due to missing
    queue configuration. (Chris Nauroth via suresh)

    MAPREDUCE-4953. HadoopPipes misuses fprintf. (Andy Isaacson via atm)

Release 2.0.2-alpha - 2012-09-07 

  INCOMPATIBLE CHANGES

  NEW FEATURES

    MAPREDUCE-987. Exposing MiniDFS and MiniMR clusters as a single process
    command-line. (ahmed via tucu)

    MAPREDUCE-4417. add support for encrypted shuffle (tucu)

    MAPREDUCE-4355. Add RunningJob.getJobStatus() (kkambatl via tucu)

    MAPREDUCE-3451. Port Fair Scheduler to MR2 (pwendell via tucu)

    MAPREDUCE-4438. Add a simple, generic client to run 'easy' AMs in YARN.
    (Bikas Saha via acmurthy) 

  IMPROVEMENTS

    MAPREDUCE-4157. ResourceManager should not kill apps that are well behaved
    (Jason Lowe via bobby)

    MAPREDUCE-4511. Add IFile readahead (ahmed via tucu)

    MAPREDUCE-4408. allow jobs to set a JAR that is in the distributed cached 
    (rkanter via tucu)

    MAPREDUCE-4440. Changed SchedulerApp and SchedulerNode to be a minimal
    interface to allow schedulers to maintain their own. (acmurthy) 

    MAPREDUCE-4146. Support limits on task status string length and number of
    block locations in branch-2. (Ahmed Radwan via tomwhite)

    MAPREDUCE-3871. Allow symlinking in LocalJobRunner DistributedCache.
    (tomwhite)

    MAPREDUCE-3921. MR AM should act on node health status changes. 
    (Bikas Saha via sseth)

    MAPREDUCE-4355. Add RunningJob.getJobStatus() (kkambatl via tucu)

    MAPREDUCE-4427. Added an 'unmanaged' mode for AMs so as to ease
    development of new applications. (Bikas Saha via acmurthy) 

    MAPREDUCE-3289. Make use of fadvise in the NM's shuffle handler.
    (Todd Lipcon and Siddharth Seth via sseth)

    MAPREDUCE-4580. Change MapReduce to use the yarn-client module.
    (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-4579. Split TestTaskAttempt into two so as to pass tests on
    jdk7. (Thomas Graves via vinodkv)

    MAPREDUCE-4638. MR AM supplies MapReduce jars in classpath rather than
    rely on YARN. (acmurthy) 

  BUG FIXES

    MAPREDUCE-4422. YARN_APPLICATION_CLASSPATH needs a documented default value in 
    YarnConfiguration. (ahmed via tucu)

    MAPREDUCE-4406. Users should be able to specify the MiniCluster ResourceManager 
    and JobHistoryServer ports. (ahmed via tucu)

    MAPREDUCE-4407. Add hadoop-yarn-server-tests-<version>-tests.jar to hadoop dist
    package. (ahmed via tucu)

    MAPREDUCE-4465. Update description of yarn.nodemanager.address property. 
    (bowang via tucu)

    MAPREDUCE-4342. Distributed Cache gives inconsistent result if cache files 
    get deleted from tasktracker. (mayank_bansal via tucu)

    MAPREDUCE-4498. Remove hsqldb jar from Hadoop runtime classpath. (rkanter via tucu)

    MAPREDUCE-4494. TestFifoScheduler failing with Metrics source QueueMetrics,q0=default 
    already exists!. (ahmed.radwan via tucu)

    MAPREDUCE-4484. Incorrect IS_MINI_YARN_CLUSTER property name in YarnConfiguration. 
    (ahmed.radwan via tucu)

    MAPREDUCE-4562. Support for "FileSystemCounter" legacy counter group name
    for compatibility reasons is creating incorrect counter name.
    (Jarek Jarcec Cecho via tomwhite)

    MAPREDUCE-4068. Jars in lib subdirectory of the submittable JAR are not added to the 
    classpath (rkanter via tucu)

    MAPREDUCE-4577. HDFS-3672 broke
    TestCombineFileInputFormat.testMissingBlocks() test (atm)

    MAPREDUCE-4470. Fix TestCombineFileInputFormat.testForEmptyFile (ikatsov via tucu)

    MAPREDUCE-4608. hadoop-mapreduce-client is missing some dependencies.
    (tucu via tomwhite)

    MAPREDUCE-4610. Support deprecated mapreduce.job.counters.limit property in
    MR2. (tomwhite)

    MAPREDUCE-4629. Remove JobHistory.DEBUG_MODE (Karthik Kambatla via bobby)

    MAPREDUCE-4642. MiniMRClientClusterFactory should not use job.setJar() (rkanter via tucu)

    MAPREDUCE-4148. MapReduce should not have a compile-time dependency on
    HDFS. (tomwhite)

    MAPREDUCE-4250. hadoop-config.sh missing variable exports, causes Yarn 
    jobs to fail with ClassNotFoundException MRAppMaster. (phunt via tucu)

    MAPREDUCE-4002. MultiFileWordCount job fails if the input path is not
    from default file system. (Bhallamudi Venkata Siva Kamesh via todd)

    MAPREDUCE-4274 MapOutputBuffer should use native byte order for kvmeta.
    (todd via bobby)

    MAPREDUCE-4262. NM gives wrong log message saying "Connected to 
    ResourceManager" before trying to connect. (Devaraj K via tgraves)

    MAPREDUCE-4276. Allow setting yarn.nodemanager.delete.debug-delay-sec 
    property to "-1" for easier container debugging. (ahmed via tucu)
 
    MAPREDUCE-4224. TestFifoScheduler throws 
    org.apache.hadoop.metrics2.MetricsException (Devaraj K via tgraves)

    MAPREDUCE-3493. Add the default mapreduce.shuffle.port property
    to mapred-default.xml (Madhukara Phatak via harsh)

    MAPREDUCE-4307. TeraInputFormat calls FileSystem.getDefaultBlockSize()
    without a Path - Failure when using ViewFileSystem. (Ahmed Radwan via eli)

    MAPREDUCE-4313. TestTokenCache doesn't compile due 
    TokenCache.getDelegationToken compilation error (bobby)

    MAPREDUCE-3873. Fixed NodeManagers' decommissioning at RM to accept IP
    addresses also. (xieguiming via vinodkv)

    MAPREDUCE-4306. Fix distributed shell to work with users other than the one
    running the daemons. (Ahmed Radwan via sseth)

    MAPREDUCE-4031. Prevent a Node Manager hang during shutdown. 
    (Devaraj K via sseth)

    MAPREDUCE-4336. Distributed Shell fails when used with the CapacityScheduler
    (ahmed via tucu)

    MAPREDUCE-4290. Fix Yarn Applicaiton Status to MR JobState conversion. 
    (Devaraj K via sseth)

    MAPREDUCE-2289. Permissions race can make getStagingDir fail on local filesystem 
    (ahmed via tucu)

    MAPREDUCE-4372. Deadlock in Resource Manager (Devaraj K via bobby)

    MAPREDUCE-4376. TestClusterMRNotification times out (Kihwal Lee via bobby)

    MAPREDUCE-4383. HadoopPipes.cc needs to include unistd.h.
    (Andy Isaacson via eli)

    MAPREDUCE-2739. Update installation docs (remove YarnClientFactory) (bowang via tucu)

    MAPREDUCE-3993. Graceful handling of codec errors during decompression 
    (kkambatl via tucu)

    MAPREDUCE-4416. Some tests fail if Clover is enabled (Kihwal Lee via bobby)

    MAPREDUCE-4441. Fix build issue caused by MR-3451 (kkambatl via tucu)

    HADOOP-8499. Lower min.user.id to 500 for the tests.
    (Colin Patrick McCabe via eli)

    MAPREDUCE-4395. Possible NPE at ClientDistributedCacheManager
    #determineTimestamps (Bhallamudi via bobby)

    MAPREDUCE-4380. Empty Userlogs directory is getting created under logs
    directory (Devaraj K via bobby)

    MAPREDUCE-4649. Ensure MapReduce JobHistory Daemon doens't assume
    HADOOP_YARN_HOME and HADOOP_MAPRED_HOME are the same. (vinodkv via
    acmurthy)

Release 2.0.0-alpha - 05-23-2012

  INCOMPATIBLE CHANGES

    MAPREDUCE-3545. Remove Avro RPC. (suresh)

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-2887. Due to HADOOP-7524, change RPC to allow multiple protocols
    including multuple versions of the same protocol (Sanjay Radia)

    MAPREDUCE-2934. MR portion of HADOOP-7607 - Simplify the RPC proxy cleanup
    process (atm)

    HADOOP-7862. MR changes to work with HADOOP 7862: Move the support for
    multiple protocols to lower layer so that Writable, PB and Avro can all
    use it (Sanjay Radia)

    MAPREDUCE-3909 Javadoc the Service interfaces (stevel)

    MAPREDUCE-3885. Avoid an unnecessary copy for all requests/responses in 
    MRs ProtoOverHadoopRpcEngine. (Devaraj Das via sseth)

	  MAPREDUCE-3935. Annotate Counters.Counter and Counters.Group as @Public.
    (tomwhite)

    MAPREDUCE-3991. Streaming FAQ has some wrong instructions about input files 
    splitting. (harsh)

    MAPREDUCE-3773. Add queue metrics with buckets for job run times. (omalley
    via acmurthy)

    MAPREDUCE-3970. Add ServiceOperations class to aid working with Services
    (stevel)

    MAPREDUCE-3353. Add a channel between RM and AM to get information on
    nodes. (Bikas Saha via acmurthy) 

    MAPREDUCE-3955. Change MR to use ProtobufRpcEngine from hadoop-common
    instead of ProtoOverHadoopRpcEngine. (Jitendra Nath Pandey via sseth)

    MAPREDUCE-4103. Fix HA docs for changes to shell command fencer args (todd)

    MAPREDUCE-4093. Improve RM WebApp start up when proxy address is not set
    (Devaraj K vai bobby)

    MAPREDUCE-4138. Reduce memory usage of counters due to non-static nested
    classes. (tomwhite)

    MAPREDUCE-3883. Document yarn.nodemanager.delete.debug-delay-sec 
    configuration property (Eugene Koontz via tgraves)

    MAPREDUCE-4219. make default container-executor.conf.dir be a path 
    relative to the container-executor binary. (rvs via tucu)

    MAPREDUCE-4205. retrofit all JVM shutdown hooks to use ShutdownHookManager 
    (tucu)

    HADOOP-8285 MR changes for Use ProtoBuf for RpcPayLoadHeader (sanjay radia)

    MAPREDUCE-2220. Fix new API FileOutputFormat-related typos in
    mapred-default.xml (Rui Kubo via harsh)

    MAPREDUCE-3907. Document entries mapred-default.xml for the
    jobhistory server. (Eugene Koontz via harsh)

    MAPREDUCE-3906. Fix inconsistency in documentation regarding
    mapreduce.jobhistory.principal. (Eugene Koontz via harsh)

    MAPREDUCE-4432. Confusing warning message when GenericOptionsParser
    is not used. (Gabriel Reid via harsh)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-3740. Fixed broken mapreduce compilation after the patch for
    HADOOP-7965. (Devaraj K via vinodkv) 

    MAPREDUCE-3818. Fixed broken compilation in TestSubmitJob after the patch
    for HDFS-2895. (Suresh Srinivas via vinodkv)

    MAPREDUCE-2942. TestNMAuditLogger.testNMAuditLoggerWithIP failing (Thomas
    Graves via mahadev)

    MAPREDUCE-3933. Failures because MALLOC_ARENA_MAX is not set (ahmed via tucu)

    MAPREDUCE-3728. ShuffleHandler can't access results when configured in a
    secure mode (ahmed via tucu)

    MAPREDUCE-3952. In MR2, when Total input paths to process == 1,
    CombinefileInputFormat.getSplits() returns 0 split. (zhenxiao via tucu)

    MAPREDUCE-3578. Starting nodemanager as root gives "Unknown -jvm option"
    (tomwhite)

    MAPREDUCE-3348. Fixed a bug in MR client to redirect to JobHistoryServer
    correctly when RM forgets the app. (Devaraj K via vinodkv)

    MAPREDUCE-3974. TestSubmitJob in MR1 tests doesn't compile after HDFS-162
    merge. (atm)

    MAPREDUCE-4007. JobClient getJob(JobID) should return NULL if the job 
    does not exist (for backwards compatibility) (tucu)

    MAPREDUCE-3431 NPE in Resource Manager shutdown. (stevel)

    MAPREDUCE-4010.  TestWritableJobConf fails on trunk (tucu via bobby)

    MAPREDUCE-3992. Reduce fetcher doesn't verify HTTP status code of response
    (todd)

    MAPREDUCE-4066. Use default value when fetching MR_AM_STAGING_DIR
    (xieguiming via harsh)

    MAPREDUCE-3377. Added a unit test to ensure OutputCommitter.checkOutputSpecs 
    is called prior to copying job.xml. (Jane Chen via acmurthy) 

    MAPREDUCE-4081. TestMROutputFormat.java does not compile (Jason Lowe via
    bobby)

    MAPREDUCE-4082. hadoop-mapreduce-client-app's mrapp-generated-classpath 
    file should not be in the module JAR (tucu)

    MAPREDUCE-3916. various issues with running yarn proxyserver (devaraj via tucu)

    MAPREDUCE-4091. tools testcases failing because of MAPREDUCE-4082 (tucu)

    MAPREDUCE-4098. TestMRApps testSetClasspath fails (tucu)

    MAPREDUCE-4097. tools testcases fail because missing mrapp-generated-classpath 
    file in classpath (rvs via tucu)

    MAPREDUCE-4113. Fix tests org.apache.hadoop.mapred.TestClusterMRNotification
    (Devaraj K via bobby)

    MAPREDUCE-4112. Fix tests org.apache.hadoop.mapred.TestClusterMapReduceTestCase
    (Devaraj K via bobby)

    MAPREDUCE-4111. Fix tests in org.apache.hadoop.mapred.TestJobName (Devaraj
    K via bobby)

    MAPREDUCE-4110. Fix tests in org.apache.hadoop.mapred.TestMiniMRClasspath &
    org.apache.hadoop.mapred.TestMiniMRWithDFSWithDistinctUsers (Devaraj K via
    bobby)

    MAPREDUCE-4105. Yarn RackResolver ignores rack configurations. 
    (Ahmed Radwan via tomwhite)

    MAPREDUCE-3869. Fix classpath for DistributedShell application. (Devaraj K
    via sseth)

    MAPREDUCE-4057. Update RAID for the HA and fsdataset changes.  (Devaraj K
    via szetszwo)

    MAPREDUCE-4076. Stream job fails with ZipException when use yarn jar
    command (Devaraj K via bobby)
 
    MAPREDUCE-4108. Fix tests in org.apache.hadoop.util.TestRunJar
    (Devaraj K via tgraves)

    MAPREDUCE-4107. Fix tests in org.apache.hadoop.ipc.TestSocketFactory
    (Devaraj K via tgraves)

    MAPREDUCE-4147. YARN should not have a compile-time dependency on HDFS.
    (tomwhite)

    MAPREDUCE-4008. ResourceManager throws MetricsException on start up 
    saying QueueMetrics MBean already exists (Devaraj K via tgraves)

    MAPREDUCE-3867. MiniMRYarn/MiniYarn uses fixed ports (tucu)

    MAPREDUCE-4141. clover integration broken, also mapreduce poms are 
    pulling in clover as a dependency. (phunt via tucu)

    MAPREDUCE-4193. broken doc link for yarn-default.xml in site.xml.
    (phunt via tomwhite)

    MAPREDUCE-4202. TestYarnClientProtocolProvider is broken (Daryn Sharp via
    bobby)

    MAPREDUCE-3173. MRV2 UI doesn't work properly without internet (Devaraj K
    via bobby)

    MAPREDUCE-3958. RM: Remove RMNodeState and replace it with NodeState
    (Bikas Saha via bobby)

    MAPREDUCE-4231. Update RAID to use the new BlockCollection interface.
    (szetszwo)

    MAPREDUCE-4483. 2.0 build does not work (John George via bobby)

    MAPREDUCE-4444. nodemanager fails to start when one of the local-dirs is
    bad (Jason Lowe via bobby)

Release 0.23.10 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-5640. Rename TestLineRecordReader in jobclient module (Jason Lowe
    via jeagles)

    MAPREDUCE-3191. docs for map output compression incorrectly reference
    SequenceFile (Chen He via jeagles)

  OPTIMIZATIONS

    MAPREDUCE-1981. Improve getSplits performance by using listLocatedStatus
    (Hairong Kuang and Jason Lowe via jlowe)

  BUG FIXES

    MAPREDUCE-3193. FileInputFormat doesn't read files recursively in the
    input path dir (Devaraj K via jlowe)

    MAPREDUCE-5380. Invalid mapred command should return non-zero exit code
    (Stephen Chu via jlowe)

    MAPREDUCE-5317. Stale files left behind for failed jobs (Ravi Prakash via
    jlowe)

    MAPREDUCE-5251. Reducer should not implicate map attempt if it has
    insufficient space to fetch map output (Ashwin Shankar via jlowe)

    MAPREDUCE-5419. TestSlive is getting FileNotFound Exception (Robert Parker
    via jlowe)

    MAPREDUCE-5440. TestCopyCommitter Fails on JDK7 (Robert Parker via jlowe)

    MAPREDUCE-5001. LocalJobRunner has race condition resulting in job
    failures (Sandy Ryza via jlowe)

    MAPREDUCE-5475. MRClientService does not verify ACLs properly (jlowe)

    MAPREDUCE-5504. mapred queue -info inconsistent with types (Kousuke Saruta
    via tgraves)

    MAPREDUCE-5513. ConcurrentModificationException in JobControl (Robert
    Parker via jlowe)

    MAPREDUCE-5586. TestCopyMapper#testCopyFailOnBlockSizeDifference fails when
    run from hadoop-tools/hadoop-distcp directory (jeagles)

    MAPREDUCE-5587. TestTextOutputFormat fails on JDK7 (jeagles)

    MAPREDUCE-5373. TestFetchFailure.testFetchFailureMultipleReduces could fail
    intermittently (jeagles)

Release 0.23.9 - 2013-07-08

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-5084. fix coverage org.apache.hadoop.mapreduce.v2.app.webapp and
    org.apache.hadoop.mapreduce.v2.hs.webapp (Aleksey Gorshkov via jeagles)

  OPTIMIZATIONS

    MAPREDUCE-5268. Improve history server startup performance (Karthik
    Kambatla via jlowe)

  BUG FIXES

    MAPREDUCE-5308. Shuffling to memory can get out-of-sync when fetching
    multiple compressed map outputs (Nathan Roberts via jlowe)

    MAPREDUCE-5315.  DistCp reports success even on failure. (mithun and jlowe
    via daryn)

    MAPREDUCE-4019. -list-attempt-ids is not working (Ashwin Shankar,
    Devaraj K, and B Anil Kumar via jlowe)

    MAPREDUCE-5316. job -list-attempt-ids command does not handle illegal
    task-state (Ashwin Shankar via jlowe)

Release 0.23.8 - 2013-06-05

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-5065. DistCp should skip checksum comparisons if block-sizes 
    are different on source/target (Mithun Radhakrishnan via kihwal)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-5015. Coverage fix for org.apache.hadoop.mapreduce.tools.CLI
    (Aleksey Gorshkov via tgraves)

    MAPREDUCE-5147. Maven build should create 
    hadoop-mapreduce-client-app-VERSION.jar directly (Robert Parker via tgraves)

    MAPREDUCE-4927. Historyserver 500 error due to NPE when accessing specific
    counters page for failed job. (Ashwin Shankar via jlowe)

Release 0.23.7 - 2013-04-18

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-4905. test org.apache.hadoop.mapred.pipes 
    (Aleksey Gorshkov via bobby)

    MAPREDUCE-4989. JSONify DataTables input data for Attempts page (Ravi
    Prakash via jlowe)

    MAPREDUCE-5027. Shuffle does not limit number of outstanding connections
    (Robert Parker via jeagles)

    MAPREDUCE-4972. Coverage fixing for org.apache.hadoop.mapreduce.jobhistory
    (Aleksey Gorshkov via bobby)

  OPTIMIZATIONS

    MAPREDUCE-4946. Fix a performance problem for large jobs by reducing the
    number of map completion event type conversions. (Jason Lowe via sseth)

    MAPREDUCE-4822. Unnecessary conversions in History Events. (Chu Tong via
    jlowe)

  BUG FIXES

    MAPREDUCE-4458. Warn if java.library.path is used for AM or Task
    (Robert Parker via jeagles)

    MAPREDUCE-4992. AM hangs in RecoveryService when recovering tasks with
    speculative attempts (Robert Parker via jlowe)

    MAPREDUCE-5009. Killing the Task Attempt slated for commit does not clear
    the value from the Task commitAttempt member (Robert Parker via jeagles)

    MAPREDUCE-4871. AM uses mapreduce.jobtracker.split.metainfo.maxsize but
    mapred-default has mapreduce.job.split.metainfo.maxsize (Jason Lowe via
    jeagles)

    MAPREDUCE-4794. DefaultSpeculator generates error messages on normal
    shutdown (Jason Lowe via jeagles)

    MAPREDUCE-5043. Fetch failure processing can cause AM event queue to
    backup and eventually OOM (Jason Lowe via bobby)

    MAPREDUCE-5023. History Server Web Services missing Job Counters (Ravi
    Prakash via tgraves)

    MAPREDUCE-5060. Fetch failures that time out only count against the first
    map task (Robert Joseph Evans via jlowe)

    MAPREDUCE-5042. Reducer unable to fetch for a map task that was recovered
    (Jason Lowe via bobby)

    MAPREDUCE-5053. java.lang.InternalError from decompression codec cause
    reducer to fail (Robert Parker via jeagles)

    MAPREDUCE-4991. coverage for gridmix (Aleksey Gorshkov via tgraves)

    MAPREDUCE-5007. fix coverage org.apache.hadoop.mapreduce.v2.hs (Aleksey
    Gorshkov via tgraves)

    MAPREDUCE-5137. AM web UI: clicking on Map Task results in 500 error
    (Thomas Graves via jlowe)

Release 0.23.6 - 2013-02-06

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-4811. JobHistoryServer should show when it was started in WebUI
    About page (Ravi Prakash via jlowe)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-4802. Takes a long time to load the task list on the AM for
    large jobs (Ravi Prakash via bobby)

    MAPREDUCE-4764. repair TestBinaryTokenFile (Ivan A. Veselovsky via bobby)

    MAPREDUCE-4825. JobImpl.finished doesn't expect ERROR as a final job state
    (jlowe via bobby)

    MAPREDUCE-4817. Hardcoded task ping timeout kills tasks localizing large 
    amounts of data (tgraves)

    MAPREDUCE-4836. Elapsed time for running tasks on AM web UI tasks page is 0
    (Ravi Prakash via jeagles)

    MAPREDUCE-4842. Shuffle race can hang reducer (Mariappan Asokan via jlowe)

    MAPREDUCE-4833. Task can get stuck in FAIL_CONTAINER_CLEANUP (Robert
    Parker via jlowe)

    MAPREDUCE-4793. Problem with adding resources when using both -files and
    -file to hadoop streaming (jlowe)

    MAPREDUCE-4890. Invalid TaskImpl state transitions when task fails while
    speculating (jlowe)

    MAPREDUCE-4902. Fix typo "receievd" should be "received" in log output
    (Albert Chu via jlowe)

    MAPREDUCE-4813. AM timing out during job commit (jlowe via bobby)

    MAPREDUCE-4279. getClusterStatus() fails with null pointer exception when
    running jobs in local mode (Devaraj K via bobby)

    MAPREDUCE-4832. MR AM can get in a split brain situation (jlowe)

    MAPREDUCE-4894. Renewal / cancellation of JobHistory tokens (Siddharth
    Seth via tgraves)

    MAPREDUCE-4819. AM can rerun job after reporting final job status to the
    client (bobby and Bikas Saha via bobby)

    MAPREDUCE-4913. TestMRAppMaster#testMRAppMasterMissingStaging occasionally 
    exits (Jason Lowe via tgraves)

    MAPREDUCE-4848. TaskAttemptContext cast error during AM recovery (Jerry
    Chen via jlowe)

    MAPREDUCE-4921. JobClient should acquire HS token with RM principal 
    (daryn via bobby)

    MAPREDUCE-4934. Maven RAT plugin is not checking all source files (tgraves)

    MAPREDUCE-4678. Running the Pentomino example with defaults throws
    java.lang.NegativeArraySizeException (Chris McConnell via harsh)

    MAPREDUCE-4925. The pentomino option parser may be buggy.
    (Karthik Kambatla via harsh)

Release 0.23.5 - 2012-11-28

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-4596. Split StateMachine state from states seen by MRClientProtocol
    for Job, Task and TaskAttempt. (Siddarth Seth via vinodkv) 

    MAPREDUCE-4752. Reduce MR AM memory usage through String Interning (Robert
    Evans via tgraves)

    MAPREDUCE-4266. remove Ant remnants from MR (tgraves via bobby)

    MAPREDUCE-4666. JVM metrics for history server (jlowe via jeagles)

  OPTIMIZATIONS

    MAPREDUCE-4720. Browser thinks History Server main page JS is taking too 
    long (Ravi Prakash via bobby)

  BUG FIXES

    MAPREDUCE-4554. Job Credentials are not transmitted if security is turned 
    off (Benoy Antony via bobby)

    MAPREDUCE-4705. Fix a bug in job history lookup, which makes older jobs
    inaccessible despite the presence of a valid history file. (Jason Lowe
    via sseth)

    MAPREDUCE-4521. mapreduce.user.classpath.first incompatibility with 0.20/1.x
    (Ravi Prakash via bobby)

    MAPREDUCE-4721. Task startup time in JHS is same as job startup time.
    (Ravi Prakash via bobby)

    MAPREDUCE-4479. Fix parameter order in assertEquals() in 
    TestCombineInputFileFormat.java (Mariappan Asokan via bobby)

    MAPREDUCE-4733. Reducer can fail to make progress during shuffle if too many
    reducers complete consecutively. (Jason Lowe via vinodkv)

    MAPREDUCE-4740. only .jars can be added to the Distributed Cache
    classpath. (Robert Joseph Evans via jlowe)

    MAPREDUCE-4229. Intern counter names in the JT (Miomir Boljanovic and bobby via daryn)

    MAPREDUCE-4741. WARN and ERROR messages logged during normal AM shutdown.
    (Vinod Kumar Vavilapalli via jlowe)

    MAPREDUCE-4730. Fix Reducer's EventFetcher to scale the map-completion
    requests slowly to avoid HADOOP-8942. (Jason Lowe via vinodkv)

    MAPREDUCE-4748. Invalid event: T_ATTEMPT_SUCCEEDED at SUCCEEDED. (jlowe)

    MAPREDUCE-4724. job history web ui applications page should be sorted to
    display last app first (tgraves via bobby)

    MAPREDUCE-4746. The MR Application Master does not have a config to set
    environment variables (Rob Parker via bobby)

    MAPREDUCE-4729. job history UI not showing all job attempts. (Vinod
    Kumar Vavilapalli via jlowe)

    MAPREDUCE-4763 repair test TestUmbilicalProtocolWithJobToken (Ivan A.
    Veselovsky via bobby)

    MAPREDUCE-4771. KeyFieldBasedPartitioner not partitioning properly when
    configured (jlowe via bobby)

    MAPREDUCE-4772. Fetch failures can take way too long for a map to be 
    restarted (bobby)

    MAPREDUCE-4782. NLineInputFormat skips first line of last InputSplit 
    (Mark Fuhs via bobby)

    MAPREDUCE-4774. JobImpl does not handle asynchronous task events in FAILED
    state (jlowe via bobby)

    MAPREDUCE-4751. AM stuck in KILL_WAIT for days (vinodkv via bobby)

    MAPREDUCE-4787. TestJobMonitorAndPrint is broken (Rob Parker via bobby)

    MAPREDUCE-4425. Speculation + Fetch failures can lead to a hung job (jlowe
    via bobby)

    MAPREDUCE-4786. Job End Notification retry interval is 5 milliseconds by
    default (Ravi Prakash via bobby)

    MAPREDUCE-4517. Too many INFO messages written out during AM to RM heartbeat
    (Jason Lowe via tgraves)

    MAPREDUCE-4797. LocalContainerAllocator can loop forever trying to contact
    the RM (jlowe via bobby)

    MAPREDUCE-4801. ShuffleHandler can generate large logs due to prematurely
    closed channels (jlowe via bobby)
 
Release 0.23.4

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-2786. Add compression option for TestDFSIO.
    (Plamen Jeliazkov via shv)

    MAPREDUCE-4645. Provide a random seed to Slive to make the sequence
    of file names deterministic. (Ravi Prakash via shv)

    MAPREDUCE-4651. Benchmarking random reads with DFSIO. (shv)

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-4647. We should only unjar jobjar if there is a lib directory 
    in it. (Robert Evans via tgraves)

    MAPREDUCE-4691. Historyserver can report "Unknown job" after RM says job
    has completed (Robert Joseph Evans via jlowe)

    MAPREDUCE-4689. JobClient.getMapTaskReports on failed job results in NPE
    (jlowe via bobby)

Release 0.23.3

  INCOMPATIBLE CHANGES

    MAPREDUCE-4072. User set java.library.path seems to overwrite default
    creating problems native lib loading (Anupam Seth via bobby)

    MAPREDUCE-3812. Lower default allocation sizes, fix allocation 
    configurations and document them (Harsh J via bobby)

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-4059. The history server should have a separate pluggable 
    storage/query interface. (Robert Evans via tgraves)

    MAPREDUCE-3942. Randomize master key generation for
    ApplicationTokenSecretManager and roll it every so often. (Vinod Kumar
    Vavilapalli via sseth)

    MAPREDUCE-4151. RM scheduler web page should filter apps to those that 
    are relevant to scheduling (Jason Lowe via tgraves)

    MAPREDUCE-4134. Remove references of mapred.child.ulimit etc. since they
    are not being used any more (Ravi Prakash via bobby)

    MAPREDUCE-3972. Fix locking and exception issues in JobHistory server.
    (Robert Joseph Evans via sseth)

    MAPREDUCE-4161. create sockets consistently (Daryn Sharp via bobby)

    MAPREDUCE-4079. Allow MR AppMaster to limit ephemeral port range.
    (bobby via tgraves)

    MAPREDUCE-4210. Expose listener address for WebApp (Daryn Sharp via bobby)

    MAPREDUCE-4162. Correctly set token service (Daryn Sharp via bobby)

    MAPREDUCE-4301. Dedupe some strings in MRAM for memory savings 
    (bobby via tgraves)

    MAPREDUCE-4267. mavenize pipes (tgraves via bobby)

    MAPREDUCE-4375. Show Configuration Tracability in MR UI (bobby 
    via tgraves)

    MAPREDUCE-4569. Fixed TestHsWebServicesJobsQuery to pass on JDK7 by not
    depending on test order. (Thomas Graves via vinodkv)

  OPTIMIZATIONS

    MAPREDUCE-3850. Avoid redundant calls for tokens in TokenCache (Daryn
    Sharp via bobby)

  BUG FIXES

    MAPREDUCE-4092.  commitJob Exception does not fail job (Jon Eagles via
    bobby)

    MAPREDUCE-4089. Hung Tasks never time out. (Robert Evans via tgraves)

    MAPREDUCE-4024. RM webservices can't query on finalStatus (Tom Graves
    via bobby)

    MAPREDUCE-4060. Multiple SLF4J binding warning (Jason Lowe via bobby)

    MAPREDUCE-3983. TestTTResourceReporting can fail, and should just be
    deleted (Ravi Prakash via bobby)

    MAPREDUCE-4012 Hadoop Job setup error leaves no useful info to users 
    (when LinuxTaskController is used). (tgraves)

    MAPREDUCE-4062. AM Launcher thread can hang forever (tgraves via bobby)

    MAPREDUCE-3988. mapreduce.job.local.dir doesn't point to a single directory
    on a node. (Eric Payne via bobby)

    MAPREDUCE-3999. Tracking link gives an error if the AppMaster hasn't
    started yet (Ravi Prakash via bobby)

    MAPREDUCE-4020. Web services returns incorrect JSON for deep queue tree
    (Anupam Seth via tgraves)

    MAPREDUCE-3672. Killed maps shouldn't be counted towards 
    JobCounter.NUM_FAILED_MAPS. (Anupam Seth via tgraves)

    MAPREDUCE-3682 Tracker URL says AM tasks run on localhost.
    (Ravi Prakash via tgraves)

    MAPREDUCE-3082. Archive command take wrong path for input file with current
    directory (John George via bobby)

    MAPREDUCE-3650. testGetTokensForHftpFS() fails (Ravi Prakash via bobby)

    MAPREDUCE-3621. TestDBJob and TestDataDrivenDBInputFormat ant tests fail
    (Ravi Prakash via tgraves)

    MAPREDUCE-4073. CS assigns multiple off-switch containers when using
    multi-level-queues (Siddharth Seth via bobby)

    MAPREDUCE-4051. Remove the empty hadoop-mapreduce-project/assembly/all.xml
    file (Ravi Prakash via bobby)

    MAPREDUCE-4117. mapred job -status throws NullPointerException (Devaraj K
    via bobby)

    MAPREDUCE-4099. ApplicationMaster may fail to remove staging directory
    (Jason Lowe via bobby)

    MAPREDUCE-4017. Add jobname to jobsummary log (tgraves and Koji Noguchi
    via bobby)

    MAPREDUCE-4040. History links should use hostname rather than IP address.
    (Bhallamudi Venkata Siva Kamesh via sseth)

    MAPREDUCE-4099 amendment. ApplicationMaster will remove staging directory
    after the history service is stopped. (Jason Lowe via sseth)

    MAPREDUCE-3932. Fix the TaskAttempt state machine to handle
    CONTIANER_LAUNCHED and CONTIANER_LAUNCH_FAILED events in additional
    states. (Robert Joseph Evans via sseth)

    MAPREDUCE-4140. mapreduce classes incorrectly importing
    "clover.org.apache.*" classes. (Patrick Hunt via tomwhite)

    MAPREDUCE-4050. For tasks without assigned containers, changes the node
    text on the UI to N/A instead of a link to null. (Bhallamudi Venkata Siva
    Kamesh via sseth)

    MAPREDUCE-4128. AM Recovery expects all attempts of a completed task to
    also be completed. (Bikas Saha via bobby)

    MAPREDUCE-4144. Fix a NPE in the ResourceManager when handling node
    updates. (Jason Lowe via sseth)

    MAPREDUCE-4156. ant build fails compiling JobInProgress (tgraves)

    MAPREDUCE-4160. some mrv1 ant tests fail with timeout - due to 4156 
    (tgraves)

    MAPREDUCE-4074. Client continuously retries to RM When RM goes down 
    before launching Application Master (xieguiming via tgraves)

    MAPREDUCE-4159. Job is running in Uber mode after setting 
    "mapreduce.job.ubertask.maxreduces" to zero (Devaraj K via bobby)

    MAPREDUCE-4165. Committing is misspelled as commiting in task logs
    (John Eagles via bobby)

    MAPREDUCE-4129. Lots of unneeded counters log messages (Ahmed Radwan via
    bobby)

    MAPREDUCE-3947. yarn.app.mapreduce.am.resource.mb not documented 
    (Devaraj K via bobby)

    MAPREDUCE-4190. Improve web UI for task attempts userlog link (Tom Graves
    via bobby)

    MAPREDUCE-4133. MR over viewfs is broken (John George via bobby)

    MAPREDUCE-4194. ConcurrentModificationError in DirectoryCollection
    (Jonathan Eagles via bobby)

    MAPREDUCE-3613. web service calls header contains 2 content types
    (tgraves)

    MAPREDUCE-4169. Container Logs appear in unsorted order (Jonathan Eagles
    via bobby)

    MAPREDUCE-4189. TestContainerManagerSecurity is failing (Devaraj K via
    bobby)

    MAPREDUCE-4209. junit dependency in hadoop-mapreduce-client is missing
    scope test (Radim Kolar via bobby)

    MAPREDUCE-4206. Sorting by Last Health-Update on the RM nodes page sorts
    does not work correctly (Jonathon Eagles via tgraves)

    MAPREDUCE-4212. TestJobClientGetJob sometimes fails 
    (Daryn Sharp via tgraves)

    MAPREDUCE-4211. Error conditions (missing appid, appid not found) are 
    masked in the RM app page (Jonathan Eagles via bobby)

    MAPREDUCE-4163. consistently set the bind address (Daryn Sharp via bobby)

    MAPREDUCE-4048. NullPointerException exception while accessing the
    Application Master UI (Devaraj K via bobby)

    MAPREDUCE-4220. RM apps page starttime/endtime sorts are incorrect
    (Jonathan Eagles via bobby)

    MAPREDUCE-4226. ConcurrentModificationException in FileSystemCounterGroup.
    (tomwhite)

    MAPREDUCE-4215. RM app page shows 500 error on appid parse error 
    (Jonathon Eagles via tgraves)

    MAPREDUCE-4237. TestNodeStatusUpdater can fail if localhost has a domain
    associated with it (bobby)

    MAPREDUCE-4233. NPE can happen in RMNMNodeInfo. (bobby)

    MAPREDUCE-4238. mavenize data_join. (tgraves)

    MAPREDUCE-4102. job counters not available in Jobhistory webui for 
    killed jobs (Bhallamudi Venkata Siva Kamesh via tgraves)

    MAPREDUCE-3543. Mavenize Gridmix. (tgraves)

    MAPREDUCE-4197. Include the hsqldb jar in the hadoop-mapreduce tar 
    file (Ravi Prakash via tgraves)

    MAPREDUCE-4269. documentation: Gridmix has javadoc warnings in 
    StressJobFactory (Jonathon Eagles via tgraves).

    MAPREDUCE-3870. Invalid App Metrics 
    (Bhallamudi Venkata Siva Kamesh via tgraves).

    MAPREDUCE-4152. map task left hanging after AM dies trying to connect to RM
    (Tom Graves via bobby)

    MAPREDUCE-4297. Usersmap file in gridmix should not fail on empty lines
    (Ravi Prakash via bobby)

    MAPREDUCE-4302. NM goes down if error encountered during log aggregation 
    (Daryn Sharp via bobby)

    MAPREDUCE-3350. Per-app RM page should have the list of application-attempts
    like on the app JHS page (Jonathon Eagles via tgraves)

    MAPREDUCE-3842. Stop webpages from automatic refreshing (tgraves)

    MAPREDUCE-3927. Shuffle hang when set map.failures.percent
    (Bhallamudi Venkata Siva Kamesh via tgraves)

    MAPREDUCE-4311. Capacity scheduler.xml does not accept decimal values for
    capacity and maximum-capacity settings (Karthik Kambatla via tgraves)

    MAPREDUCE-4341. add types to capacity scheduler properties documentation
    (Karthik Kambatla via tgraves)

    MAPREDUCE-4270. Move the data_join test classes to the correct path.
    (Thomas Graves via sseth)

    MAPREDUCE-3889. job client tries to use /tasklog interface, but that
    doesn't exist anymore (Devaraj K via bobby)

    MAPREDUCE-4320. gridmix mainClass wrong in pom.xml (tgraves)

    MAPREDUCE-4295. RM crashes due to DNS issue (tgraves)

    MAPREDUCE-4228. mapreduce.job.reduce.slowstart.completedmaps is not working
    properly (Jason Lowe via bobby)

    MAPREDUCE-4392. Counters.makeCompactString() changed behavior from 0.20
    (Jason Lowe via bobby)

    MAPREDUCE-4384. Race conditions in IndexCache (Kihwal Lee via tgraves)

    MAPREDUCE-4387. RM gets fatal error and exits during TestRM 
    (Kihwal Lee via tgraves)

    MAPREDUCE-4379. Node Manager throws java.lang.OutOfMemoryError: Java heap
    space due to org.apache.hadoop.fs.LocalDirAllocator.contexts (Devaraj K
    via bobby)

    MAPREDUCE-4402. TestFileInputFormat fails intermittently (Jason Lowe via
    bobby)

    MAPREDUCE-4300. OOM in AM can turn it into a zombie. (Robert Evans via
    tgraves)

    MAPREDUCE-4252. MR2 job never completes with 1 pending task (Tom White via
    bobby)

    MAPREDUCE-3940. ContainerTokens should have an expiry interval. (Siddharth
    Seth and Vinod Kumar Vavilapalli via vinodkv)

    MAPREDUCE-4419. ./mapred queue -info <queuename> -showJobs displays all
    the jobs irrespective of <queuename> (Devaraj K via bobby)

    MAPREDUCE-4299. Terasort hangs with MR2 FifoScheduler (Tom White via
    bobby)

    MAPREDUCE-4437. Race in MR ApplicationMaster can cause reducers to never be
    scheduled (Jason Lowe via bobby)

    MAPREDUCE-4449. Incorrect MR_HISTORY_STORAGE property name in JHAdminConfig
    (Ahmed Radwan via bobby)

    MAPREDUCE-4283. Display tail of aggregated logs by default (Jason Lowe via
    bobby)

    MAPREDUCE-4448. Fix NM crash during app cleanup if aggregation didn't
    init. (Jason Lowe via daryn)

    MAPREDUCE-3893. allow capacity scheduler configs maximum-applications and
    maximum-am-resource-percent configurable on a per queue basis (tgraves via
    bobby)

    MAPREDUCE-4467. IndexCache failures due to missing synchronization
    (Kihwal Lee via tgraves)

    MAPREDUCE-4423. Potential infinite fetching of map output (Robert Evans
    via tgraves)

    MAPREDUCE-4456. LocalDistributedCacheManager can get an 
    ArrayIndexOutOfBounds when creating symlinks (Robert Evans via tgraves)

    MAPREDUCE-4496. AM logs link is missing user name (Jason Lowe via bobby)

    MAPREDUCE-4493. Distibuted Cache Compatability Issues (Robert Evans
    via tgraves)

    MAPREDUCE-4492. Configuring total queue capacity between 100.5 and 99.5 at
    perticular level is sucessfull (Mayank Bansal via bobby)

    MAPREDUCE-4457. mr job invalid transition TA_TOO_MANY_FETCH_FAILURE at 
    FAILED  (Robert Evans via tgraves)

    MAPREDUCE-4234. SortValidator.java is incompatible with multi-user or
    parallel use (due to a /tmp file with static name) (Robert Evans via
    jeagles)

    MAPREDUCE-4504. SortValidator writes to wrong directory (Robert Evans 
    via tgraves)

    MAPREDUCE-4503. Should throw InvalidJobConfException if duplicates found in
    cacheArchives or cacheFiles (Robert Evans via jeagles)

    MAPREDUCE-3782. teragen terasort jobs fail when using webhdfs:// (Jason
    Lowe via bobby)

    MAPREDUCE-4053. Counters group names deprecation is wrong, iterating over
    group names deprecated names don't show up  (Robert Evans via tgraves)

    MAPREDUCE-3506. Calling getPriority on JobInfo after parsing a history log
    with JobHistoryParser throws a NullPointerException (Jason Lowe via bobby)

    MAPREDUCE-4570. ProcfsBasedProcessTree#constructProcessInfo() prints a
    warning if procfsDir/<pid>/stat is not found. (Ahmed Radwan via bobby)

    MAPREDUCE-4600. TestTokenCache.java from MRV1 no longer compiles  (daryn 
    via bobby)

    MAPREDUCE-4612. job summary file permissions not set when its created
    (tgraves via bobby)

    MAPREDUCE-4614. Simplify debugging a job's tokens (daryn via bobby)

    MAPREDUCE-4611. MR AM dies badly when Node is decommissioned (Robert
    Evans via tgraves)

    MAPREDUCE-4604. In mapred-default, mapreduce.map.maxattempts &
    mapreduce.reduce.maxattempts defaults are set to 4 as well as
    mapreduce.job.maxtaskfailures.per.tracker. (Ravi Prakash via jeagles)

    MAPREDUCE-4633. history server doesn't set permissions on all subdirs
    (tgraves via bobby)

    MAPREDUCE-4641. Exception in commitJob marks job as successful in job
    history (Jason Lowe via bobby)

    MAPREDUCE-4549. Distributed cache conflicts breaks backwards compatability 
    (Robert Evans via tucu)

Release 0.23.2 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    MAPREDUCE-3849. Change TokenCache's reading of the binary token file
    (Daryn Sharp via bobby)

    MAPREDUCE-3854. Fixed and reenabled tests related to MR child JVM's           
    environmental variables in TestMiniMRChildTask. (Tom White via vinodkv)

    MAPREDUCE-3877 Add a test to formalise the current state transitions
    of the yarn lifecycle. (stevel)

    MAPREDUCE-3866. Fixed the bin/yarn script to not print the command line
    unnecessarily. (vinodkv)

    MAPREDUCE-3730. Modified RM to allow restarted NMs to be able to join the
    cluster without waiting for expiry. (Jason Lowe via vinodkv)

    MAPREDUCE-2793. Corrected AppIDs, JobIDs, TaskAttemptIDs to be of correct
    format on the web pages. (Bikas Saha via vinodkv)

    MAPREDUCE-3614. Fixed MR AM to close history file quickly and send a correct
    final state to the RM when it is killed. (Ravi Prakash via vinodkv)

    MAPREDUCE-3497. Added docs for YARN CLI. (tgraves via acmurthy) 

    MAPREDUCE-3954. Added new envs to separate heap size for different daemons
    started via bin scripts. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-4025. AM can crash if task attempt reports bogus progress value
    (Jason Lowe via bobby)

    MAPREDUCE-4034. Unable to view task logs on history server with
    mapreduce.job.acl-view-job=* (Jason Lowe and Siddarth Seth via bobby)

    MAPREDUCE-4043. Secret keys set in Credentials are not seen by tasks
    (Jason Lowe via bobby) 

    MAPREDUCE-3989. Cap space usage of default log4j rolling policy.
    (Patrick Hunt via eli)

  OPTIMIZATIONS

    MAPREDUCE-3901. Modified JobHistory records in YARN to lazily load job and
    task reports so as to improve UI response times. (Siddarth Seth via vinodkv)

    MAPREDUCE-2855. Passing a cached class-loader to ResourceBundle creator to
    minimize counter names lookup time. (Siddarth Seth via vinodkv)

    MAPREDUCE-3944. Change the history jobs/ webservice to return partial job 
    info for a significant performance improvement. (Robert Joseph Evans via
    sseth)

  BUG FIXES

    MAPREDUCE-3918  proc_historyserver no longer in command line arguments for
    HistoryServer (Jon Eagles via bobby)

    MAPREDUCE-3862.  Nodemanager can appear to hang on shutdown due to lingering
    DeletionService threads (Jason Lowe via bobby)

    MAPREDUCE-3680. FifoScheduler web service rest API can print out invalid 
    JSON. (B Anil Kumar via tgraves)

    MAPREDUCE-3852. Test TestLinuxResourceCalculatorPlugin failing. (Thomas 
    Graves via mahadev)

    MAPREDUCE-3864. Fix cluster setup docs for correct SecondaryNameNode
    HTTPS parameters. (todd)

    MAPREDUCE-3583. Change pid to String and stime to BigInteger in order to
    avoid NumberFormatException caused by overflow.  (Zhihong Yu via szetszwo)

    MAPREDUCE-3634. Fixed all daemons to crash instead of hanging around when
    their EventHandlers get exceptions. (vinodkv)

    MAPREDUCE-3798. Fixed failing TestJobCleanup.testCusomCleanup() and moved it
    to the maven build. (Ravi Prakash via vinodkv)

    MAPREDUCE-3884. PWD should be first in the classpath of MR tasks (tucu)

    MAPREDUCE-3878. Null user on filtered jobhistory job page (Jonathon Eagles
    via tgraves)

    MAPREDUCE-3738. MM can hang during shutdown if AppLogAggregatorImpl thread
    dies unexpectedly (Jason Lowe via sseth)

    MAPREDUCE-3904 Job history produced with mapreduce.cluster.acls.enabled
    false can not be viewed with mapreduce.cluster.acls.enabled true 
    (Jonathon Eagles via tgraves)

    MAPREDUCE-3910. Fixed a bug in CapacityScheduler LeafQueue which was causing
    app-submission to fail. (John George via vinodkv)

    MAPREDUCE-3686. Fixed two bugs in Counters because of which web app displays
    zero counter values for framework counters. (Bhallamudi Venkata Siva Kamesh
    via vinodkv)

    MAPREDUCE-3913. RM application webpage is unresponsive after 2000 jobs 
    (Jason Lowe via tgraves)
 
    MAPREDUCE-3922. Fixed build to not compile 32bit container-executor binary
    by default on all platforms. (Hitesh Shah via vinodkv)

    MAPREDUCE-3790. Broken pipe on streaming job can lead to truncated output for
    a successful job (Jason Lowe via bobby)

    MAPREDUCE-3816. capacity scheduler web ui bar graphs for used capacity wrong
    (tgraves via bobby)

    MAPREDUCE-3930. Fixed an NPE while accessing the AM page/webservice for a 
    task attempt without an assigned container. (Robert Joseph Evans via
    sseth)

    MAPREDUCE-3931. Changed PB implementation of LocalResource to take locks
    so that race conditions don't fail tasks by inadvertantly changing the
    timestamps. (Siddarth Seth via vinodkv)

    MAPREDUCE-3687.  If AM dies before it returns new tracking URL, proxy
    redirects to http://N/A/ and doesn't return error code (Ravi Prakash via
    bobby)
 
    MAPREDUCE-3920. Revise yarn default port number selection 
    (Dave Thompson via tgraves)

    MAPREDUCE-3903. Add support for mapreduce admin users. (Thomas Graves via
    sseth)

    MAPREDUCE-3706. Fix circular redirect error in job-attempts page. (bobby
    via acmurthy)

    MAPREDUCE-3896. Add user information to the delegation token issued by the
    history server. (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-3792. Fix "bin/mapred job -list" to display all jobs instead of
    only the jobs owned by the user. (Jason Lowe via vinodkv)

    MAPREDUCE-3929. Fixed output of 'bin/mapred queue -showacl' command to 
    clarify ACLs for users. (John George via acmurthy) 

    MAPREDUCE-3960. Fix web-proxy to forward request to AM with configured
    hostname or IP. (tgraves via acmurthy) 

    MAPREDUCE-3897. Fixed computation of maxActiveAppsPerUser for queues by
    using capacity and not max-capacity since we are already scaling it by
    userLimitFactor. (Eric Payne via acmurthy) 

    MAPREDUCE-3009. Fixed node link on JobHistory webapp. (chackaravarthy via 
    vinodkv)

    MAPREDUCE-3964. ResourceManager does not have JVM metrics (Jason Lowe via
    bobby)

    MAPREDUCE-3034. Ensure NodeManager reboots itself on direction from
    ResourceManager. (Devaraj K & Eric Payne via acmurthy) 

    MAPREDUCE-3976. TestRMContainerAllocator failing (Jason Lowe via bobby)

    MAPREDUCE-3961. Map/ReduceSlotMillis computation incorrect (Siddharth Seth
    via bobby)

    MAPREDUCE-3977. LogAggregationService leaks log aggregator objects
    (Jason Lowe via bobby)

    MAPREDUCE-3975. Default value not set for Configuration parameter
    mapreduce.job.local.dir (Eric Payne via bobby)

    MAPREDUCE-3982. Fixed FileOutputCommitter to not err out for an 'empty-job'
    whose tasks don't write any outputs. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-4005. Fixes broken AM container logs URL on ResourceManager
    Application Info page. (Jason Lowe via sseth)

    MAPREDUCE-4006. History server container log web UI sometimes combines
    stderr/stdout/syslog contents together (Siddharth Seth via tgraves)

    MAPREDUCE-4061. RM only has 1 AM launcher thread (tgraves via bobby)

Release 0.23.1 - 2012-02-17

  NEW FEATURES

    MAPREDUCE-778. Rumen Anonymizer. (Amar Kamat and Chris Douglas via amarrk)

    MAPREDUCE-3121. NodeManager should handle disk-failures (Ravi Gummadi via mahadev)

    MAPREDUCE-2863. Support web services for YARN and MR components. (Thomas
    Graves via vinodkv)

    MAPREDUCE-3251. Network ACLs can prevent some clients to talk to MR ApplicationMaster.
    (Anupam Seth via mahadev)

    MAPREDUCE-778. Rumen Anonymizer. (Amar Kamat and Chris Douglas via amarrk)

  IMPROVEMENTS

    MAPREDUCE-3481. [Gridmix] Improve Gridmix STRESS mode. (amarrk)

    MAPREDUCE-3597. [Rumen] Rumen should provide APIs to access all the 
                    job-history related information.

    MAPREDUCE-3375. [Gridmix] Memory Emulation system tests. 
                    (Vinay Thota via amarrk)

    MAPREDUCE-3840.  JobEndNotifier doesn't use the proxyToUse during connecting
    (Ravi Prakash via bobby)

    MAPREDUCE-3736. Variable substitution depth too large for fs.default.name 
    causes jobs to fail (ahmed via tucu).
 
    MAPREDUCE-2733. [Gridmix] Gridmix3 cpu emulation system tests. 
                    (Vinay Thota via amarrk)

    MAPREDUCE-3297. Moved log related components into yarn-common so that
    HistoryServer and clients can use them without depending on the
    yarn-server-nodemanager module. (Siddharth Seth via vinodkv)

    MAPREDUCE-3336. Replaced guice internal.Preconditions api usage with the
    public Preconditions API. (Thomas Graves via vinodkv)

    MAPREDUCE-3280. Removed the unnecessary job user-name configuration in
    mapred-site.xml. (vinodkv)

    MAPREDUCE-3370. Fixed MiniMRYarnCluster and related tests to not use
    a hard-coded path for the mr-app jar. (Ahmed Radwan via vinodkv)

    MAPREDUCE-3325. Improvements to CapacityScheduler doc. (Thomas Graves 
    via mahadev)

    MAPREDUCE-3341. Enhance logging of initalized queue limit values.
    (Anupam Seth via mahadev)

    MAPREDUCE-3243. Invalid tracking URL for streaming jobs (Jonathan Eagles 
    via mahadev)

    MAPREDUCE-3331. Improvement to single node cluster setup documentation for 
    0.23 (Anupam Seth via mahadev)

    MAPREDUCE-3102. Changed NodeManager to fail fast when LinuxContainerExecutor
    has wrong configuration or permissions. (Hitesh Shah via vinodkv)

    MAPREDUCE-3415. improve MiniMRYarnCluster & DistributedShell JAR
    resolution. (tucu)

    MAPREDUCE-3169. Create a new MiniMRCluster equivalent which only provides 
    client APIs cross MR1 and MR2. (Ahmed via tucu)

    MAPREDUCE-3373. Hadoop scripts unconditionally source
    "$bin"/../libexec/hadoop-config.sh. (Bruno Mahé via tomwhite)

    MAPREDUCE-3372. HADOOP_PREFIX cannot be overridden.
    (Bruno Mahé via tomwhite)

    MAPREDUCE-3411. Performance Upgrade for jQuery (Jonathan Eagles via 
    mahadev)

    MAPREDUCE-3371. Review and improve the yarn-api javadocs. (Ravi Prakash
    via mahadev)

    MAPREDUCE-3238. Small cleanup in SchedulerApp. (Todd Lipcon via mahadev)

    MAPREDUCE-3413. RM web ui applications not sorted in any order by default.
    (Jonathan Eagles via mahadev)

    MAPREDUCE-3045. Fixed UI filters to not filter on hidden title-numeric
    sort fields. (Jonathan Eagles via sseth)

    MAPREDUCE-3448. TestCombineOutputCollector javac unchecked warning on mocked
    generics (Jonathan Eagles via mahadev)

    MAPREDUCE-3169 amendment. Deprecate MiniMRCluster. (Ahmed Radwan via
    sseth)

    MAPREDUCE-3369. Migrate MR1 tests to run on MR2 using the new interfaces
    introduced in MAPREDUCE-3169. (Ahmed Radwan via tomwhite)

    MAPREDUCE-3518. mapred queue -info <queue> -showJobs throws NPE. 
    (Jonathan Eagles via mahadev)

    MAPREDUCE-3391. Making a trivial change to correct a log message in
    DistributedShell app's AM. (Subroto Sanyal via vinodkv)

    MAPREDUCE-3547. Added a bunch of unit tests for the the RM/NM webservices.
    (Thomas Graves via acmurthy)

    MAPREDUCE-3610. Remove use of the 'dfs.block.size' config for default block
    size fetching. Use FS#getDefaultBlocksize instead. (Sho Shimauchi via harsh)

    MAPREDUCE-3478. Cannot build against ZooKeeper 3.4.0. (Tom White via mahadev)

    MAPREDUCE-3528. Fixed TaskHeartBeatHandler to use a new configuration
    for the thread loop interval separate from task-timeout configuration
    property. (Siddharth Seth via vinodkv)

    MAPREDUCE-3312. Modified MR AM to not send a stop-container request for
    a container that isn't launched at all. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3382. Enhanced MR AM to use a proxy to ping the job-end
    notification URL. (Ravi Prakash via vinodkv)

    MAPREDUCE-3299. Added AMInfo table to the MR AM job pages to list all the
    job-attempts when AM restarts and recovers. (Jonathan Eagles via vinodkv)

    MAPREDUCE-3251. Network ACLs can prevent some clients to talk to MR AM.
    Improved the earlier patch to not to JobHistoryServer repeatedly.
    (Anupam Seth via vinodkv)

    MAPREDUCE-3553. Add support for data returned when exceptions thrown from web 
    service apis to be in either xml or in JSON. (Thomas Graves via mahadev)

    MAPREDUCE-3641. Making CapacityScheduler more conservative so as to 
    assign only one off-switch container in a single scheduling
    iteration. (Arun C Murthy via vinodkv)

    MAPREDUCE-3692. yarn-resourcemanager out and log files can get big. (eli)

    MAPREDUCE-3710. Improved FileInputFormat to return better locality for the
    last split. (Siddarth Seth via vinodkv)

    MAPREDUCE-2765. DistCp Rewrite. (Mithun Radhakrishnan via mahadev)

    MAPREDUCE-3737. The Web Application Proxy's is not documented very well.
    (Robert Evans via mahadev)

    MAPREDUCE-3699. Increased RPC handlers for all YARN servers to reasonable
    values for working at scale. (Hitesh Shah via vinodkv)

    MAPREDUCE-3693. Added mapreduce.admin.user.env to mapred-default.xml.
    (Roman Shapshonik via acmurthy) 

    MAPREDUCE-3732. Modified CapacityScheduler to use only users with pending
    requests for computing user-limits. (Arun C Murthy via vinodkv)

    MAPREDUCE-3679. AM logs and others should not automatically refresh after every 1 
    second. (Vinod KV  via mahadev)

    MAPREDUCE-3754. Modified RM UI to filter applications based on state of the
    applications. (vinodkv)

    MAPREDUCE-3774. Moved yarn-default.xml to hadoop-yarn-common from
    hadoop-server-common. (Mahadev Konar via vinodkv)

    MAPREDUCE-3771. Un-deprecated the old mapred apis, port of MAPREDUCE-1735.
    (acmurthy)

    MAPREDUCE-3784. Fixed CapacityScheduler so that maxActiveApplications and
    maxActiveApplicationsPerUser per queue are not too low for small
    clusters. (Arun C Murthy via vinodkv)

  OPTIMIZATIONS

    MAPREDUCE-3567. Extraneous JobConf objects in AM heap. (Vinod Kumar
    Vavilapalli via sseth)

    MAPREDUCE-3399. Modifying ContainerLocalizer to send a heartbeat to NM
    immediately after downloading a resource instead of always waiting for a
    second. (Siddarth Seth via vinodkv)

    MAPREDUCE-3568. Optimized Job's progress calculations in MR AM. (vinodkv)

    MAPREDUCE-3569. TaskAttemptListener holds a global lock for all
    task-updates. (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-3511. Removed a multitude of cloned/duplicate counters in the AM
    thereby reducing the AM heap size and preventing full GCs. (vinodkv)

    MAPREDUCE-3618. Fixed TaskHeartbeatHandler to not hold a global lock for all
    task-updates. (Siddarth Seth via vinodkv)

    MAPREDUCE-3512. Batching JobHistory flushing to DFS so that we don't flush
    for every event slowing down AM. (Siddarth Seth via vinodkv)

    MAPREDUCE-3718. Change default AM heartbeat interval to 1 second. (Hitesh
    Shah via sseth)

    MAPREDUCE-3360. Added information about lost/rebooted/decommissioned nodes
    on the webapps. (Bhallamudi Venkata Siva Kamesh and Jason Lowe via vinodkv)

    MAPREDUCE-3756. Made single shuffle limit configurable. (Hitesh Shah via
    acmurthy) 

    MAPREDUCE-3811. Made jobclient-to-AM retries configurable. (sseth via
    acmurthy) 

  BUG FIXES

    MAPREDUCE-2784. [Gridmix] Bug fixes in ExecutionSummarizer and 
                    ResourceUsageMatcher. (amarrk)

    MAPREDUCE-3194. "mapred mradmin" command is broken in mrv2
                     (Jason Lowe via bobby)

    MAPREDUCE-3462. Fix Gridmix JUnit testcase failures. 
                    (Ravi Prakash and Ravi Gummadi via amarrk)

    MAPREDUCE-2950. [Rumen] Fixed TestUserResolve. (Ravi Gummadi via amarrk)

    MAPREDUCE-3412. Fix 'ant docs'. (amarrk)

    MAPREDUCE-3346 [Rumen] LoggedTaskAttempt#getHostName() returns null.
                   (amarrk)

    MAPREDUCE-3221. Reenabled the previously ignored test in TestSubmitJob
    and fixed bugs in it. (Devaraj K via vinodkv)

    MAPREDUCE-3215. Reenabled and fixed bugs in the failing test
    TestNoJobSetupCleanup. (Hitesh Shah via vinodkv)

    MAPREDUCE-3219. Reenabled and fixed bugs in the failing test
    TestDelegationToken. (Hitesh Shah via vinodkv)

    MAPREDUCE-3217. Reenabled and fixed bugs in the failing ant test
    TestAuditLogger. (Devaraj K via vinodkv)

    MAPREDUCE-3291. App fail to launch due to delegation token not 
    found in cache (Robert Evans via mahadev)

    MAPREDUCE-3344. o.a.h.mapreduce.Reducer since 0.21 blindly casts to
    ReduceContext.ValueIterator. (Brock Noland via tomwhite)

    MAPREDUCE-3342. Fixed JobHistoryServer to also show the job's queue
    name. (Jonathan Eagles via vinodkv)

    MAPREDUCE-3345. Fixed a race condition in ResourceManager that was causing
    TestContainerManagerSecurity to fail sometimes. (Hitesh Shah via vinodkv)

    MAPREDUCE-3368. Fixed test compilation. (Hitesh Shah via vinodkv)

    MAPREDUCE-3333. Fixed bugs in ContainerLauncher of MR AppMaster due to
    which per-container connections to NodeManager were lingering long enough
    to hit the ulimits on number of processes. (vinodkv)

    MAPREDUCE-3392. Fixed Cluster's getDelegationToken's API to return null
    when there isn't a supported token. (John George via vinodkv)

    MAPREDUCE-3379. Fixed LocalResourceTracker in NodeManager to remove deleted
    cache entries correctly. (Siddharth Seth via vinodkv)

    MAPREDUCE-3324. Not All HttpServer tools links (stacks,logs,config,metrics) are 
    accessible through all UI servers (Jonathan Eagles via mahadev)

    MAPREDUCE-3355. Fixed MR AM's ContainerLauncher to handle node-command
    timeouts correctly. (vinodkv)

    MAPREDUCE-3407. Fixed pom files to refer to the correct MR app-jar needed
    by the integration tests. (Hitesh Shah via vinodkv)

    MAPREDUCE-3437. Fix examples pom to refer to the correct 0.23 snapshot
    version. (Jonathan Eagles via todd)

    MAPREDUCE-3434. Nightly build broken (Hitesh Shah via mahadev)

    MAPREDUCE-3447. mapreduce examples not working (mahadev)

    MAPREDUCE-3444. trunk/0.23 builds broken (Hitesh Shah via mahadev)

    MAPREDUCE-3454. [Gridmix] TestDistCacheEmulation is broken (Hitesh Shah
    via mahadev)

    MAPREDUCE-3408. yarn-daemon.sh unconditionnaly sets yarn.root.logger 
    (Bruno Mahe via mahadev)

    MAPREDUCE-3329. Fixed CapacityScheduler to ensure maximum-capacity cannot
    be lesser than capacity for any queue. (acmurthy)

    MAPREDUCE-3464. mapreduce jsp pages missing DOCTYPE. (Dave Vronay via mattf)

    MAPREDUCE-3265. Removed debug logs during job submission to LOG.debug to
    cut down noise. (acmurthy) 

    MAPREDUCE-3468. Changed ant based infrastructure to use 0.23.1 version.
    (sseth via acmurthy) 

    MAPREDUCE-3433. Finding counters by legacy group name returns empty
    counters. (tomwhite)

    MAPREDUCE-3450. NM port info no longer available in JobHistory.
    (Siddharth Seth via mahadev)

    MAPREDUCE-3477. Hadoop site documentation cannot be built anymore. 
    (jeagles via tucu)

    MAPREDUCE-3488. Streaming jobs are failing because the main class
    isnt set in the pom files. (mahadev)
 
    MAPREDUCE-3463. Second AM fails to recover properly when first AM is killed with
    java.lang.IllegalArgumentException causing lost job. (Siddharth Seth via mahadev)

    MAPREDUCE-3452. fifoscheduler web ui page always shows 0% used for the queue.
    (Jonathan Eagles via mahadev)

    MAPREDUCE-3443. JobClient and Job should function in the context of the
    UGI which created them. (Mahadev Konar via sseth)

    MAPREDUCE-3460. MR AM can hang if containers are allocated on a node
    blacklisted by the AM. (Hitesh Shah and Robert Joseph Evans via sseth)

    MAPREDUCE-3453. RM web ui application details page shows RM cluster about
    information. (Jonathan Eagles via sseth)

    MAPREDUCE-3479. JobClient#getJob cannot find local jobs. (tomwhite)

    MAPREDUCE-3500. MRJobConfig creates an LD_LIBRARY_PATH using the platform ARCH. (tucu)

    MAPREDUCE-3456. $HADOOP_PREFIX/bin/yarn should set defaults for 
    $HADOOP_*_HOME (Eric Payne via mahadev)

    MAPREDUCE-3458. Fix findbugs warnings in hadoop-examples. (Devaraj K
    via mahadev)

    MAPREDUCE-3485. DISKS_FAILED -101 error code should be defined in same location as 
    ABORTED_CONTAINER_EXIT_STATUS. (Ravi Gummadi via mahadev)

    MAPREDUCE-3389. MRApps loads the 'mrapp-generated-classpath' file with 
    classpath from the build machine. (tucu)

    MAPREDUCE-3496. Fixed client to print queue acls in consistent order.
    (Jonathan Eagles via acmurthy) 

    MAPREDUCE-3147. Handle leaf queues with the same name properly.
    (Ravi Prakash via mahadev)

    MAPREDUCE-3327. RM web ui scheduler link doesn't show correct max value 
    for queues (Anupam Seth via mahadev)

    MAPREDUCE-3513. Capacity Scheduler web UI has a spelling mistake for Memory.
    (chackaravarthy via mahadev)

    MAPREDUCE-3519. Fixed a deadlock in NodeManager LocalDirectories's handling
    service. (Ravi Gummadi via vinodkv)

    MAPREDUCE-3527. Fix minor API incompatibilities between 1.0 and 0.23.
    (tomwhite)

    MAPREDUCE-3328. mapred queue -list output inconsistent and missing child 
    queues. (Ravi Prakash via mahadev)

    MAPREDUCE-3510. Capacity Scheduler inherited ACLs not displayed by mapred queue 
    -showacls (Jonathan Eagles via mahadev)

    MAPREDUCE-3537. Fix race condition in DefaultContainerExecutor which led
    to container localization occuring in wrong directories. (acmurthy)

    MAPREDUCE-3542. Support "FileSystemCounter" legacy counter group name for
    compatibility. (tomwhite)

    MAPREDUCE-3426. Fixed MR AM in uber mode to write map intermediate outputs
    in the correct directory to work properly in secure mode. (Hitesh Shah via
    vinodkv)

    MAPREDUCE-3544. gridmix build is broken, requires hadoop-archives to be 
    added as ivy dependency. (tucu)

    MAPREDUCE-3557. MR1 test fail to compile because of missing hadoop-archives 
    dependency. (tucu)

    MAPREDUCE-3541. Fix broken TestJobQueueClient test. (Ravi Prakash via 
    mahadev)

    MAPREDUCE-3398. Fixed log aggregation to work correctly in secure mode.
    (Siddharth Seth via vinodkv)

    MAPREDUCE-3530. Fixed an NPE occuring during scheduling in the
    ResourceManager. (Arun C Murthy via vinodkv)

    MAPREDUCE-3484. Fixed JobEndNotifier to not get interrupted before completing
    all its retries. (Ravi Prakash via vinodkv)

    MAPREDUCE-3531. Fixed a race in ContainerTokenSecretManager. (Robert Joseph
    Evans via sseth)

    MAPREDUCE-3560. TestRMNodeTransitions is failing on trunk. 
    (Siddharth Seth via mahadev)

    MAPREDUCE-3487. Fixed JobHistory web-UI to display links to single task's
    counters' page. (Jason Lowe via vinodkv)

    MAPREDUCE-3564. Fixed failures in TestStagingCleanup and TestJobEndNotifier
    tests. (Siddharth Seth via vinodkv)

    MAPREDUCE-3422. Counter display names are not being picked up. (Jonathan
    Eagles via sseth)

    MAPREDUCE-3366. Mapreduce component should use consistent directory structure 
    layout as HDFS/common (Eric Yang via mahadev)

    MAPREDUCE-3387. Fixed AM's tracking URL to always go through the proxy, even
    before the job started, so that it works properly with oozie throughout
    the job execution. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3579. ConverterUtils shouldn't include a port in a path from a url 
    without a port. (atm via harsh)

    MAPREDUCE-3563. Fixed LocalJobRunner to work correctly with new mapreduce
    apis. (acmurthy)

    MAPREDUCE-3376. Fixed Task to ensure it passes reporter to combiners using
    old MR api. (Subroto Sanyal via acmurthy)

    MAPREDUCE-3339. Fixed MR AM to stop considering node blacklisting after the
    number of nodes blacklisted crosses a threshold. (Siddharth Seth via vinodkv)

    MAPREDUCE-3588. Fixed bin/yarn which was broken by MAPREDUCE-3366 so that
    yarn daemons can start. (Arun C Murthy via vinodkv)

    MAPREDUCE-3349. Log rack-name in JobHistory for unsuccessful tasks. (Amar
    Kamat and Devaraj K via sseth)

    MAPREDUCE-3586. Modified CompositeService to avoid duplicate stop operations
    thereby solving race conditions in MR AM shutdown. (vinodkv)

    MAPREDUCE-3604. Fixed streaming to use new mapreduce.framework.name to
    check for local mode. (acmurthy) 

    MAPREDUCE-3521. Fixed streaming to ensure it doesn't silently ignore
    unknown arguments. (Robert Evans via acmurthy) 

    MAPREDUCE-3522. Ensure queues inherit ACLs from parent if they aren't
    explicitly specified. (Jonathan Eagles via acmurthy) 

    MAPREDUCE-3608. Fixed compile issue with MAPREDUCE-3522. (mahadev via
    acmurthy) 

    MAPREDUCE-3490. Fixed MapReduce AM to count failed maps also towards Reduce
    ramp up. (Sharad Agarwal and Arun C Murthy via vinodkv)

    MAPREDUCE-3529. TokenCache does not cache viewfs credentials correctly
    (sseth)

    MAPREDUCE-3595. Add missing TestCounters#testCounterValue test from branch
    1 to 0.23 (Tom White via sseth)

    MAPREDUCE-3566. Fixed MR AM to construct CLC only once across all tasks.
    (vinodkv via acmurthy) 

    MAPREDUCE-3572. Moved AM event dispatcher to a separate thread for
    performance reasons. (vinodkv via acmurthy) 

    MAPREDUCE-3615. Fix some ant test failures. (Thomas Graves via sseth)

    MAPREDUCE-1744. DistributedCache creates its own FileSytem instance when 
    adding a file/archive to the path. (Dick King via tucu)

    MAPREDUCE-3326. Added detailed information about queue's to the
    CapacityScheduler web-ui. (Jason Lowe via acmurthy) 

    MAPREDUCE-3548. Added more unit tests for MR AM & JHS web-services.
    (Thomas Graves via acmurthy) 

    MAPREDUCE-3617. Removed wrong default value for
    yarn.resourcemanager.principal and yarn.nodemanager.principal. (Jonathan
    Eagles via acmurthy) 

    MAPREDUCE-3624. Remove unnecessary dependency on JDK's tools.jar. (mahadev
    via acmurthy)

    MAPREDUCE-3616. Thread pool for launching containers in MR AM not
    expanding as expected. (vinodkv via sseth)

    MAPREDUCE-3639. Fixed TokenCache to work with absent FileSystem canonical
    service-names. (Siddharth Seth via vinodkv)

    MAPREDUCE-3380. Token infrastructure for running clients which are not kerberos 
    authenticated. (mahadev)

    MAPREDUCE-3648. TestJobConf failing. (Thomas Graves via mahadev)

    MAPREDUCE-3651. TestQueueManagerRefresh fails. (Thomas Graves via mahadev)

    MAPREDUCE-3645. TestJobHistory fails. (Thomas Graves via mahadev)
  
    MAPREDUCE-3652. org.apache.hadoop.mapred.TestWebUIAuthorization.testWebUIAuthorization 
    fails. (Thomas Graves via mahadev)

    MAPREDUCE-3625. CapacityScheduler web-ui display of queue's used capacity is broken.
    (Jason Lowe via mahadev)

    MAPREDUCE-3596. Fix scheduler to handle cleaned up containers, which NMs
    may subsequently report as running. (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-3656. Fixed a race condition in MR AM which is failing the sort
    benchmark consistently. (Siddarth Seth via vinodkv)

    MAPREDUCE-3532. Modified NM to report correct http address when an ephemeral
    web port is configured. (Bhallamudi Venkata Siva Kamesh via vinodkv)

    MAPREDUCE-3404. Corrected MR AM to honor speculative configuration and enable
    speculating either maps or reduces. (Eric Payne via vinodkv)

    MAPREDUCE-3664. Federation Documentation has incorrect configuration example.
    (Brandon Li via jitendra)

    MAPREDUCE-3649. Job End notification gives an error on calling back.
    (Ravi Prakash via mahadev)

    MAPREDUCE-3657. State machine visualize build fails. (Jason Lowe 
    via mahadev)

    MAPREDUCE-2450. Fixed a corner case with interrupted communication threads
    leading to a long timeout in Task. (Rajesh Balamohan via acmurthy)

    MAPREDUCE-3669. Allow clients to talk to MR HistoryServer using both
    delegation tokens and kerberos. (mahadev via acmurthy)

    MAPREDUCE-3684. LocalDistributedCacheManager does not shut down its thread
    pool (tomwhite)

    MAPREDUCE-3582. Move successfully passing MR1 tests to MR2 maven tree.
    (ahmed via tucu)

    MAPREDUCE-3698. Client cannot talk to the history server in secure mode.
    (mahadev)

    MAPREDUCE-3689. RM web UI doesn't handle newline in job name.
    (Thomas Graves via mahadev)

    MAPREDUCE-3701. Delete HadoopYarnRPC from 0.23 branch.
    (mahadev)

    MAPREDUCE-3549. write api documentation for web service apis for RM, NM, 
    mapreduce app master, and job history server (Thomas Graves via mahadev)

    MAPREDUCE-3705. ant build fails on 0.23 branch. (Thomas Graves via
    mahadev)
 
    MAPREDUCE-3691. webservices add support to compress response.
    (Thomas Graves via mahadev)

    MAPREDUCE-3702. internal server error trying access application master 
    via proxy with filter enabled (Thomas Graves via mahadev)

    MAPREDUCE-3646. Remove redundant URL info from "mapred job" output.
    (Jonathan Eagles via mahadev)

    MAPREDUCE-3681. Fixed computation of queue's usedCapacity. (acmurthy) 

    MAPREDUCE-3505. yarn APPLICATION_CLASSPATH needs to be overridable. 
    (ahmed via tucu)

    MAPREDUCE-3714. Fixed EventFetcher and Fetcher threads to shut-down properly
    so that reducers don't hang in corner cases. (vinodkv)

    MAPREDUCE-3712. The mapreduce tar does not contain the hadoop-mapreduce-client-
    jobclient-tests.jar. (mahadev)

    MAPREDUCE-3717. JobClient test jar has missing files to run all the test programs.
    (mahadev)

    MAPREDUCE-3630. Fixes a NullPointer exception while running TeraGen - if a
    map is asked to generate 0 records. (Mahadev Konar via sseth)

    MAPREDUCE-3683. Fixed maxCapacity of queues to be product of parent
    maxCapacities. (acmurthy)

    MAPREDUCE-3713. Fixed the way head-room is allocated to applications by
    CapacityScheduler so that it deducts current-usage per user and not
    per-application. (Arun C Murthy via vinodkv)

    MAPREDUCE-3721. Fixed a race in shuffle which caused reduces to hang.
    (sseth via acmurthy) 

    MAPREDUCE-3733. Add Apache License Header to hadoop-distcp/pom.xml.
    (mahadev)

    MAPREDUCE-3735. Add distcp jar to the distribution (tar).
    (mahadev)

    MAPREDUCE-3720. Changed bin/mapred job -list to not print job-specific
    information not available at RM. (vinodkv via acmurthy) 

    MAPREDUCE-3742. "yarn logs" command fails with ClassNotFoundException.
    (Jason Lowe via mahadev)

    MAPREDUCE-3703. ResourceManager should provide node lists in JMX output.
    (Eric Payne via mahadev)

    MAPREDUCE-3716. Fixing YARN+MR to allow MR jobs to be able to use
    java.io.File.createTempFile to create temporary files as part of their
    tasks. (Jonathan Eagles via vinodkv)

    MAPREDUCE-3748. Changed a log in CapacityScheduler.nodeUpdate to debug.
    (ramya via acmurthy) 

    MAPREDUCE-3764. Fixed resource usage metrics for queues and users.
    (acmurthy)

    MAPREDUCE-3749. ConcurrentModificationException in counter groups.
    (tomwhite)

    MAPREDUCE-3762. Fixed default CapacityScheduler configs. (mahadev via
    acmurthy) 

    MAPREDUCE-3499. New MiniMR does not setup proxyuser configuration 
    correctly, thus tests using doAs do not work. (johnvijoe via tucu)

    MAPREDUCE-3696. MR job via oozie does not work on hadoop 23.
    (John George via mahadev)

    MAPREDUCE-3427. Fix streaming unit tests broken after mavenization.
    (Hitesh Shah via acmurthy) 

    MAPREDUCE-3640. Allow AMRecovery to work with partial JobHistory files.
    (Arun C Murthy via sseth)

    MAPREDUCE-3752. Modified application limits to include queue max-capacities
    besides the usual user limits. (Arun C Murthy via vinodkv)

    MAPREDUCE-3744. Fix the yarn logs command line. Improve error messages for
    mapred job -logs. (Jason Lowe via sseth)

    MAPREDUCE-3780. Fixed a bug where applications killed before getting
    activated were not getting cleaned up properly. (Hitesh Shah via acmurthy)

    MAPREDUCE-3708. Metrics: Incorrect Apps Submitted Count (Bhallamudi via 
    mahadev)

    MAPREDUCE-3727. jobtoken location property in jobconf refers to wrong 
    jobtoken file (tucu)

    MAPREDUCE-3711. Fixed MR AM recovery so that only single selected task
    output is recovered and thus reduce the unnecessarily bloated recovery
    time. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3760. Changed active nodes list to not contain unhealthy nodes
    on the webUI and metrics. (vinodkv)

    MAPREDUCE-3417. Fixed job-access-controls to work with MR AM and
    JobHistoryServer web-apps. (Jonathan Eagles via vinodkv)

    MAPREDUCE-3803. Fix broken build of raid contrib due to HDFS-2864.
    (Ravi Prakash via suresh)

    MAPREDUCE-3791. can't build site in hadoop-yarn-server-common.
    (mahadev)

    MAPREDUCE-3723. TestAMWebServicesJobs & TestHSWebServicesJobs 
    incorrectly asserting tests (Bhallamudi Venkata Siva Kamesh
    via mahadev)

    MAPREDUCE-3795. "job -status" command line output is malformed.
    (vinodkv via mahadev)

    MAPREDUCE-3759. ClassCastException thrown in -list-active-trackers when 
    there are a few unhealthy nodes (vinodkv via mahadev)

    MAPREDUCE-3775. Change MiniYarnCluster to escape special chars in testname.
    (Hitesh Shah via mahadev)

    MAPREDUCE-3765. FifoScheduler does not respect yarn.scheduler.fifo.minimum-
    allocation-mb setting (Hitesh Shah via mahadev)

    MAPREDUCE-3747. Initialize queue metrics upfront and added start/finish
    time to RM Web-UI. (acmurthy) 

    MAPREDUCE-3814. Fixed MRV1 compilation. (Arun C Murthy via vinodkv)

    MAPREDUCE-3810. Performance tweaks - reduced logging in AM and defined
    hascode/equals for ResourceRequest & Priority. (vinodkv via acmurthy) 

    MAPREDUCE-3813. Added a cache for resolved racks. (vinodkv via acmurthy)   

    MAPREDUCE-3808. Fixed an NPE in FileOutputCommitter for jobs with maps
    but no reduces. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3804. yarn webapp interface vulnerable to cross scripting attacks
    (Dave Thompson via bobby)

    MAPREDUCE-3354. Changed scripts so that jobhistory server is started by
    bin/mapred instead of bin/yarn. (Jonathan Eagles via acmurthy) 

    MAPREDUCE-3809. Ensure that there is no needless sleep in Task at the end
    of the task. (sseth via acmurthy)

    MAPREDUCE-3794. Support mapred.Task.Counter and mapred.JobInProgress.Counter 
    enums for compatibility (Tom White via mahadev)

    MAPREDUCE-3697. Support binary compatibility for Counters after
    MAPREDUCE-901. (mahadev via acmurthy) 

    MAPREDUCE-3817. Fixed bin/mapred to allow running of distcp and archive
    jobs. (Arpit Gupta via acmurthy) 

    MAPREDUCE-3709. TestDistributedShell is failing. (Hitesh Shah via 
    mahadev)

    MAPREDUCE-3436. JobHistory webapp address should use the host configured
    in the jobhistory address. (Ahmed Radwan via sseth)

    MAPREDUCE-3815. Fixed MR AM to always use hostnames and never IPs when
    requesting containers so that scheduler can give off data local containers
    correctly. (Siddarth Seth via vinodkv)
 
    MAPREDUCE-3833. Fixed a bug in reinitiaziling of queues. (Jason Lowe via
    acmurthy) 

    MAPREDUCE-3826. Fixed a bug in RM web-ui which broke sorting. (Jonathan
    Eagles via acmurthy)

    MAPREDUCE-3823. Ensure counters are calculated only once after a job
    finishes. (Vinod Kumar Vavilapalli via sseth)

    MAPREDUCE-3827. Changed Counters to use ConcurrentSkipListMap for
    performance. (vinodkv via acmurthy)  

    MAPREDUCE-3822. Changed FS counter computation to use all occurences of
    the same FS scheme, instead of randomly using one. (Mahadev Konar via
    sseth)

    MAPREDUCE-3834. Changed MR AM to not add the same rack entry multiple times
    into the container request table when multiple hosts for a split happen to
    be on the same rack. (Siddarth Seth via vinodkv)

    MAPREDUCE-3828. Ensure that urls in single-node mode are correct. (sseth
    via acmurthy) 

    MAPREDUCE-3770. Zombie.getJobConf() results into NPE. (amarrk)

    MAPREDUCE-3843. Job summary log file found missing on the RM host 
    (Anupam Seth via tgraves)

    MAPREDUCE-3846. Addressed MR AM hanging issues during AM restart and then
    the recovery. (vinodkv)

    MAPREDUCE-3802. Added test to validate that AM can crash multiple times and
    still can recover successfully after MAPREDUCE-3846. (vinodkv)

    MAPREDUCE-3858. Task attempt failure during commit results in task never completing.
    (Tom White via mahadev)

    MAPREDUCE-3856. Instances of RunningJob class givs incorrect job tracking
    urls when mutiple jobs are submitted from same client jvm. (Eric Payne via
    sseth)

    MAPREDUCE-3880. Changed LCE binary to be 32-bit. (acmurthy)

Release 0.23.0 - 2011-11-01 

  INCOMPATIBLE CHANGES

    MAPREDUCE-2455. Remove deprecated JobTracker.State in favour of
    JobTrackerStatus. (tomwhite)

    MAPREDUCE-2430. Remove mrunit contrib. (nigel via eli)

    MAPREDUCE-2606. Remove IsolationRunner. (Alejandro Abdelnur via eli)

  NEW FEATURES

    MAPREDUCE-2682. Add "mapred classpath" command to print classpath
    for MR applications. (vinodkv via acmurthy) 

    MAPREDUCE-2107. [Gridmix] Total heap usage emulation in Gridmix.
    (Amar Kamat and Ravi Gummadi via amarrk)

    MAPREDUCE-2106. [Gridmix] Cumulative CPU usage emulation in Gridmix. 
    (amarrk)

    MAPREDUCE-2543. [Gridmix] High-Ram feature emulation in Gridmix. (amarrk)

    MAPREDUCE-2408. [Gridmix] Compression emulation in Gridmix. (amarrk)

    MAPREDUCE-2473. Add "mapred groups" command to query the server-side groups
    resolved for a user. (Aaron T. Myers via todd)

    MAPREDUCE-461. Enable ServicePlugins for the JobTracker.
    (Fredrik Hedberg via tomwhite)

    MAPREDUCE-2521. Create RPM and Debian packages for MapReduce. Changes 
    deployment layout to be consistent across the binary tgz, rpm, and deb.
    (Eric Yang via omalley)

    MAPREDUCE-2323. Add metrics to the fair scheduler. (todd)

    MAPREDUCE-2037. Capture intermediate progress, CPU and memory usage for
    tasks. (Dick King via acmurthy) 

    MAPREDUCE-279. MapReduce 2.0. Merging MR-279 branch into trunk. Contributed by
    Arun C Murthy, Christopher Douglas, Devaraj Das, Greg Roelofs, Jeffrey
    Naisbitt, Josh Wills, Jonathan Eagles, Krishna Ramachandran, Luke Lu, Mahadev
    Konar, Robert Evans, Sharad Agarwal, Siddharth Seth, Thomas Graves, and Vinod
    Kumar Vavilapalli.

    MAPREDUCE-2930. Added the ability to be able to generate graphs from the
    state-machine definitions. (Binglin Chang via vinodkv)

    MAPREDUCE-2719. Add a simple, DistributedShell, application to illustrate
    alternate frameworks on YARN. (Hitesh Shah via acmurthy)

    MAPREDUCE-3104. Implemented Application-acls. (vinodkv)

    MAPREDUCE-2708. Designed and implemented MR Application Master recovery to
    make MR AMs resume their progress after restart. (Sharad Agarwal via vinodkv)

    MAPREDUCE-2858. Added a WebApp Proxy for applications. (Robert Evans via
    acmurthy) 

  IMPROVEMENTS

    MAPREDUCE-2187. Reporter sends progress during sort/merge. (Anupam Seth via
    acmurthy) 

    MAPREDUCE-2365. Add counters to track bytes (read,written) via 
    File(Input,Output)Format. (Siddharth Seth via acmurthy)
 
    MAPREDUCE-2680. Display queue name in job client CLI. (acmurthy) 
 
    MAPREDUCE-2679. Minor changes to sync trunk with MR-279 branch. (acmurthy) 
 
    MAPREDUCE-2400. Remove Cluster's dependency on JobTracker via a 
    ServiceProvider for the actual implementation. (tomwhite via acmurthy) 
 
    MAPREDUCE-2596. [Gridmix] Summarize Gridmix runs. (amarrk)

    MAPREDUCE-2563. [Gridmix] Add High-Ram emulation system tests to 
    Gridmix. (Vinay Kumar Thota via amarrk)

    MAPREDUCE-2104. [Rumen] Add Cpu, Memory and Heap usages to 
    TraceBuilder's output. (amarrk)

    MAPREDUCE-2554. [Gridmix]  Add distributed cache emulation system tests 
    to Gridmix. (Vinay Kumar Thota via amarrk)
 
    MAPREDUCE-2543. [Gridmix] High-Ram feature emulation testcase. (amarrk)

    MAPREDUCE-2469. Task counters should also report the total heap usage of 
    the task. (Ravi Gummadi and Amar Ramesh Kamat via amarrk)

    MAPREDUCE-2544. [Gridmix] Add compression emulation system tests to 
    Gridmix. (Vinay Kumar Thota via amarrk)

    MAPREDUCE-2517. [Gridmix] Add system tests to Gridmix. 
    (Vinay Kumar Thota via amarrk)

    MAPREDUCE-2492. The new MapReduce API should make available task's
    progress to the task. (amarrk)

    MAPREDUCE-2153. Bring in more job configuration properties in to the trace 
    file. (Rajesh Balamohan via amarrk)

    MAPREDUCE-1461. Feature to instruct rumen-folder utility to skip jobs worth 
    of specific duration. (Rajesh Balamohan via amarrk)

    MAPREDUCE-2172. Added test-patch.properties required by test-patch.sh 
    (nigel)

    MAPREDUCE-2156. Raid-aware FSCK. (Patrick Kling via dhruba)

    MAPREDUCE-2215. A more elegant FileSystem#listCorruptFileBlocks API
    (RAID changes) (Patrick Kling via hairong)

    MAPREDUCE-1831. BlockPlacement policy for HDFS-RAID.
    (Scott Chen via dhruba)

    MAPREDUCE-1906. Lower minimum heartbeat interval for TaskTracker
    (Scott Carey and Todd Lipcon via todd)

    MAPREDUCE-1382. MRAsyncDiscService should tolerate missing local.dir.
    (Zheng Shao and tomwhite via tomwhite)

    MAPREDUCE-2263. MapReduce side of HADOOP-6904: RPC compatibility.
    (hairong)

    MAPREDUCE-1706. Log RAID recoveries on HDFS. (schen)

    MAPREDUCE-2334. Update BlockPlacementPolicyRaid for the new method
    in BlockPlacementPolicy.  (szetszwo)

    MAPREDUCE-2254. Allow setting of end-of-record delimiter for
    TextInputFormat (Ahmed Radwan via todd)

    MAPREDUCE-1927. Unit test for HADOOP-6835 (concatenated gzip support).
    (Greg Roelofs via tomwhite)

    MAPREDUCE-2206. The task-cleanup tasks should be optional. (schen)

    MAPREDUCE-2225. MultipleOutputs should not require the use of 'Writable'.
    (Harsh J Chouraria via tomwhite)

    MAPREDUCE-1811. Job.monitorAndPrintJob() should print status of the job
    at completion. (Harsh J Chouraria via tomwhite)

    MAPREDUCE-993. bin/hadoop job -events <jobid> <from-event-#> <#-of-events>
    help message is confusing. (Harsh J Chouraria via tomwhite)

    MAPREDUCE-2302. Add static factory methods in GaloisField. (schen)

    MAPREDUCE-2351. mapred.job.tracker.history.completed.location should
    support an arbitrary filesystem URI. (tomwhite)

    MAPREDUCE-2239. BlockPlacementPolicyRaid should call getBlockLocations
    only when necessary. (schen)

    MAPREDUCE-2331. Add coverage of task graph servlet to fair scheduler system
    test. (todd)

    MAPREDUCE-2367. Allow using a file to exclude certain tests from build.
    (todd)

    MAPREDUCE-2202. Generalize CLITest structure and interfaces to faciliate
    upstream adoption (e.g. for web or system testing). (cos)

    MAPREDUCE-2420. JobTracker should be able to renew delegation token over 
    HTTP (Boris Shkolnik via jitendra)

    MAPREDUCE-2474. Add docs to the new API Partitioner on how to access the
    Job Configuration. (Harsh J Chouraria via todd)
    
    MAPREDUCE-2475. Disable IPV6 for junit tests. (suresh srinivas via mahadev)

    MAPREDUCE-2422. Removed unused internal methods from DistributedCache.
    (tomwhite)

    MAPREDUCE-2456. Log the reduce taskID and associated TaskTrackers with
    failed fetch notifications in the JobTracker log.
    (Jeffrey Naisbitt via cdouglas)

    MAPREDUCE-869. Documentation for config to set map/reduce task environment
    (Alejandro Abdelnur via todd)

    MAPREDUCE-2410. Add entry to streaming FAQ about how streaming reducers
    receive keys. (Harsh J Chouraria via todd)

    MAPREDUCE-2499. MR part of HADOOP-7291. (eli)

    MAPREDUCE-2497. Missing spaces in error messages. (eli)

    MAPREDUCE-2502. JobSubmitter should use mapreduce.job.maps instead of
    its deprecated equivalent. (eli via todd)

    MAPREDUCE-2381. JobTracker instrumentation not consistent about error
    handling. (Philip Zeyliger via tomwhite)

    MAPREDUCE-2449. Allow for command line arguments when performing
    "Run on Hadoop" action in Eclipse plugin. (Jeff Zemerick via todd)

    MAPREDUCE-2483. Remove duplication of jars between Hadoop subprojects
    from build artifacts. (Eric Yang via omalley)

    MAPREDUCE-2372. TaskLogAppender mechanism shouldn't be set up in
    log4j.properties (todd)

    MAPREDUCE-2516. Rename webinterface.private.actions to
    mapreduce.jobtracker.webinterface.trusted (Ari Rabkin via todd)

    MAPREDUCE-2459. Cache HAR filesystem metadata. (Mac Yang via mahadev)

    HADOOP-7259. Contrib modules should include the build.properties from
    the enclosing hadoop directory. (omalley)

    MAPREDUCE-2494. Order distributed cache deletions by LRU. (Robert Joseph
    Evans via cdouglas)

    MAPREDUCE-2452. Makes the cancellation of delegation tokens happen in a 
    separate thread. (ddas)

    HADOOP-7106. Reorganize project SVN layout to "unsplit" the projects.
    (todd, nigel)

    MAPREDUCE-2249. Check the reflexive property of Counters objects when
    comparing equality. (Devaraj K via todd)

    MAPREDUCE-2623. Update ClusterMapReduceTestCase to use
    MiniDFSCluster.Builder (Harsh J Chouraria via eli)

    MAPREDUCE-2602. Allow setting of end-of-record delimiter for
    TextInputFormat for the old API. (Ahmed Radwan via todd)

    MAPREDUCE-2705. Permits parallel multiple task launches. 
    (Thomas Graves via ddas)

    MAPREDUCE-2489. Jobsplits with random hostnames can make the queue 
    unusable (jeffrey naisbit via mahadev)

    MAPREDUCE-2854. update INSTALL with config necessary run mapred on yarn.
    (thomas graves via mahadev)

    MAPREDUCE-2701. app/Job.java needs UGI for the user that launched it.
    (Robert Evans via mahadev)

    MAPREDUCE-2652. Enabled multiple NMs to be runnable on a single node by
    making shuffle service port to be truely configurable. (Robert Evans via
    vinodkv)

    MAPREDUCE-2735. Add an applications summary log to ResourceManager.
    (Thomas Graves via acmurthy) 

    MAPREDUCE-2697. Enhance CapacityScheduler to cap concurrently running
    applications per-queue & per-user. (acmurthy) 
    Configuration changes:
      add yarn.capacity-scheduler.maximum-am-resource-percent

    MAPREDUCE-2774. Add startup message to ResourceManager & NodeManager on
    startup. (Venu Gopala Rao via acmurthy) 

    MAPREDUCE-2655. Add audit logs to ResourceManager and NodeManager. (Thomas
    Graves via acmurthy)

    MAPREDUCE-2864. Normalize configuration variable names for YARN. (Robert
    Evans via acmurthy) 

    MAPREDUCE-2690. Web-page for FifoScheduler. (Eric Payne via acmurthy) 

    MAPREDUCE-2711. Update TestBlockPlacementPolicyRaid for the new namesystem
    and block management APIs.  (szetszwo)

    MAPREDUCE-2933. Change allocate call to return ContainerStatus for
    completed containers rather than Container. (acmurthy) 

    MAPREDUCE-2675. Reformat JobHistory Server main page to be more
    useful. (Robert Joseph Evans via vinodkv).

    MAPREDUCE-2896. Simplify all apis to in
    org.apache.hadoop.yarn.api.records.* to be get/set only. Added javadocs to
    all public records. (acmurthy)

    MAPREDUCE-2676. MR-279: JobHistory Job page needs reformatted. (Robert Evans via 
    mahadev)

    MAPREDUCE-2899. Replace major parts of ApplicationSubmissionContext with a 
    ContainerLaunchContext (Arun Murthy via mahadev)

    MAPREDUCE-2966. Added ShutDown hooks for MRV2 processes so that they can
    gracefully exit. (Abhijit Suresh Shingate via vinodkv)

    MAPREDUCE-2672. MR-279: JobHistory Server needs Analysis this job. 
    (Robert Evans via mahadev)

    MAPREDUCE-2965. Streamlined the methods hashCode(), equals(), compareTo()
    and toString() for all IDs. (Siddharth Seth via vinodkv)

    MAPREDUCE-2726. Added job-file to the AM and JobHistoryServer web
    interfaces. (Jeffrey Naisbitt via vinodkv)

    MAPREDUCE-2880. Improve classpath-construction for mapreduce AM and
    containers. (Arun C Murthy via vinodkv)

    MAPREDUCE-3055. Simplified ApplicationAttemptId passing to
    ApplicationMaster via environment variable. (vinodkv)

    MAPREDUCE-3092. Removed a special comparator for JobIDs in JobHistory as
    JobIDs are already comparable. (Devaraj K via vinodkv)

    MAPREDUCE-3099. Add docs for setting up a single node MRv2 cluster.
    (mahadev)

    MAPREDUCE-3001. Added task-specific counters to AppMaster and JobHistory
    web-UIs. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3098. Fixed RM and MR AM to report YarnApplicationState and
    application's FinalStatus separately. (Hitesh Shah via vinodkv)

    MAPREDUCE-2889. Added documentation for writing new YARN applications.
    (Hitesh Shah via acmurthy) 

    MAPREDUCE-3134. Added documentation the CapacityScheduler. (acmurthy) 

    MAPREDUCE-3013. Removed YarnConfiguration.YARN_SECURITY_INFO and its usage
    as it doesn't affect security any more. (vinodkv)

    MAPREDUCE-2907. Changed log level for various messages in ResourceManager
    from INFO to DEBUG. (Ravi Prakash via vinodkv)

    MAPREDUCE-2702. Added a new API in OutputCommitter for recovering
    the outputs of tasks from a crashed job so as to support MR Application
    Master recovery. (Sharad Agarwal and Arun C Murthy via vinodkv)

    MAPREDUCE-2738. Added the missing cluster level statistics on the RM web
    UI. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-2988. Reenabled TestLinuxContainerExecutor reflecting the
    current NodeManager code. (Robert Joseph Evans via vinodkv) 

    MAPREDUCE-3161. Improved some javadocs and fixed some typos in
    YARN. (Todd Lipcon via vinodkv)

    MAPREDUCE-3148. Ported MAPREDUCE-2702 to old mapred api for aiding task
    recovery. (acmurthy) 

    MAPREDUCE-3133. Running a set of methods in a Single Test Class.
    (Jonathan Eagles via mahadev)

    MAPREDUCE-3059. QueueMetrics do not have metrics for aggregate 
    containers-allocated and aggregate containers-released.
    (Devaraj K via mahadev)
   
    MAPREDUCE-3187. Add names for various unnamed threads in MR2.
    (Todd Lipcon and Siddharth Seth via mahadev)

    MAPREDUCE-3136. Added documentation for setting up Hadoop clusters in both
    non-secure and secure mode for both HDFS & YARN. (acmurthy)

    MAPREDUCE-3068. Added a whitelist of environment variables for containers
    from the NodeManager and set MALLOC_ARENA_MAX for all daemons and
    containers. (Chris Riccomini via acmurthy)

    MAPREDUCE-3144. Augmented JobHistory with the information needed for
    serving aggregated logs. (Siddharth Seth via vinodkv)
  
    MAPREDUCE-3163. JobClient spews errors when killing MR2 job.
    (mahadev)

    MAPREDUCE-3239. Use new createSocketAddr API in MRv2 to give better 
    error messages on misconfig (Todd Lipcon via mahadev)

    MAPREDUCE-2747. Cleaned up LinuxContainerExecutor binary sources and changed
    the configuration to use yarn names. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3205. Fix memory specifications to be physical rather than
    virtual, allowing for a ratio between the two to be configurable. (todd
    via acmurthy) 

    MAPREDUCE-2986. Fixed MiniYARNCluster to support multiple NodeManagers.
    (Anupam Seth via vinodkv)

    MAPREDUCE-2736. Remove unused contrib components dependent on MR1. (eli)

    MAPREDUCE-2989. Modified JobHistory to link to task and AM logs from the
    JobHistoryServer. (Siddharth Seth via vinodkv)

    MAPREDUCE-3014. Rename and invert logic of '-cbuild' profile to 'native' and off 
    by default. (tucu)

    MAPREDUCE-3171. normalize nodemanager native code compilation with common/hdfs
    native. (tucu)

    MAPREDUCE-3146. Added a MR specific command line to dump logs for a
    given TaskAttemptID. (Siddharth Seth via vinodkv)

    MAPREDUCE-3275. Added documentation for AM WebApp Proxy. (Robert Evans via
    acmurthy)

    MAPREDUCE-3322. Added a better index.html and an brief overview of YARN
    architecture. (acmurthy) 

  OPTIMIZATIONS

    MAPREDUCE-2026. Make JobTracker.getJobCounters() and
    JobInProgress.getCounters() aquire locks in a shorter time period.
    (Joydeep Sen Sarma via schen)

    MAPREDUCE-2740. MultipleOutputs in new API creates needless
    TaskAttemptContexts. (todd)

    MAPREDUCE-901. Efficient framework counters. (llu via acmurthy)

    MAPREDUCE-2629. Workaround a JVM class loading quirk which prevents
    JIT compilation of inner classes methods in ReduceContextImpl.

  BUG FIXES

    MAPREDUCE-2603. Disable High-Ram emulation in system tests. 
    (Vinay Kumar Thota via amarrk)

    MAPREDUCE-2539. Fixed NPE in getMapTaskReports in JobClient. (Robert Evans via
    acmurthy) 

    MAPREDUCE-1978. Rumen TraceBuilder should provide recursive
    input folder scanning.

    MAPREDUCE-2416. Remove the restriction of specifying group names in
    users-list file for Gridmix in RoundRobinUserResolver mode.

    MAPREDUCE-2417. Fix Gridmix in RoundRobinUserResolver mode to
    map testing/proxy users to unique users in a trace.

    MAPREDUCE-2307. Exception thrown in Jobtracker logs, when the Scheduler
    configured is FairScheduler. (Devaraj K via matei)

    MAPREDUCE-2199. build is broken 0.22 branch creation. (cos)

    MAPREDUCE-1752. Implement getFileBlockLocations in HarFilesystem.
    (Patrick Kling via dhruba)

    MAPREDUCE-2155. RaidNode should optionally use the mapreduce jobs to 
    fix missing blocks.  (Patrick Kling via dhruba)

    MAPREDUCE-1334. Fix TestIndexUpdater by ignoring _SUCCESS file in HDFS.
    (Kay Kay via yhemanth)

    MAPREDUCE-2232. Add missing methods to TestMapredGroupMappingServiceRefresh.
    (Todd Lipcon via eli)

    MAPREDUCE-2271. Fix TestSetupTaskScheduling failure on trunk.
    (Liyin Liang via todd)

    MAPREDUCE-2290. Fix compilation error in TestTaskCommit. (eli)

    MAPREDUCE-2294. Fix compilation error in mumak. (todd)

    MAPREDUCE-2300. Fix TestUmbilicalProtocolWithJobToken on trunk after
    HADOOP-6904. (todd)

    MAPREDUCE-2296. Fix references to misspelled method name
    getProtocolSigature (todd)

    MAPREDUCE-2311. Fix TestFairScheduler failure (schen)

    MAPREDUCE-1996. API: Reducer.reduce() method detail misstatement.
    (Harsh J Chouraria via tomwhite)

    MAPREDUCE-2203. Wrong javadoc for TaskRunner's appendJobJarClasspaths
    method. (Jingguo Yao via tomwhite)

    MAPREDUCE-2074. Task should fail when symlink creation fails.
    (Priyo Mustafi via tomwhite)

    MAPREDUCE-1242. Chain APIs error misleading.
    (Harsh J Chouraria via tomwhite)

    MAPREDUCE-2379. Adds missing DistributedCache configurations in 
    mapred-default.xml (Todd Lipcon via amareshwari)

    MAPREDUCE-2348. Disable mumak tests on trunk since they currently time out
    (todd)

    MAPREDUCE-2395. TestBlockFixer timing out on trunk. (Ramkumar Vadali via
    todd)

    MAPREDUCE-2426. Make TestFairSchedulerSystem fail with more verbose output
    (todd)

    MAPREDUCE-2448. NoSuchMethodError:
    org.apache.hadoop.hdfs.TestDatanodeBlockScanner.corruptReplica(..) (eli)

    MAPREDUCE-2460. Fix flaky test TestFairSchedulerSystem. (todd)

    MAPREDUCE-2451. Log the details from health check script at the
    JobTracker. (Thomas Graves via cdouglas)

    MAPREDUCE-2467. HDFS-1052 changes break the raid contrib module in 
    MapReduce. (suresh srinivas via mahadev)

    MAPREDUCE-2258. IFile reader closes stream and compressor in wrong order.
    (todd via tomwhite)

    MAPREDUCE-2518. The t flag is missing in distcp help message.  (Wei Yongjun
    via szetszwo)

    MAPREDUCE-2514. Fix typo in TaskTracker ReinitTrackerAction log message.
    (Jonathan Eagles via cdouglas)

    MAPREDUCE-2490. Add logging to graylist and blacklist activity to aid
    diagnosis of related issues. (Jonathan Eagles via cdouglas)

    MAPREDUCE-2495. exit() the TaskTracker when the distributed cache cleanup
    thread dies. (Robert Joseph Evans via cdouglas)

    MAPREDUCE-2470. Fix NPE in RunningJobs::getCounters. (Robert Joseph Evans
    via cdouglas)

    MAPREDUCE-2536. Update FsShell -mv command usage in TestMRCLI.  (Daryn
    Sharp via szetszwo)

    MAPREDUCE-2529. Add support for regex-based shuffle metric counting
    exceptions. (Thomas Graves via cdouglas)

    MAPREDUCE-2559. ant binary fails due to missing c++ lib dir. (eli)

    MAPREDUCE-2573. Fix new findbugs warning introduced by MAPREDUCE-2494.
    (Robert Joseph Evans via todd)

    MAPREDUCE-2581. Spelling errors in log messages. (Tim Sell via eli)

    MAPREDUCE-2588. Change raid to the new DataTransferProtocol API.  (szetszwo)

    MAPREDUCE-2576. Typo in comment in SimulatorLaunchTaskAction.java.
    (Tim Sell via jghoman)

    MAPREDUCE-2550. Fix bin/mapred to work properly from within a source
    checkout (Eric Yang via todd)

    MAPREDUCE-2620. Update RAID for HDFS-2087.  (szetszwo)

    MAPREDUCE-2624. Update RAID for HDFS-2107.  (szetszwo)

    MAPREDUCE-2670. Fixing spelling mistake in FairSchedulerServlet.java. (eli)

    MAPREDUCE-2710. Update JobSubmitter.printTokens(..) for HDFS-2161.
    (szetszwo)

    MAPREDUCE-2409. DistributedCache maps files and archives to the same path,
    despite semantic incompatibility. (Siddharth Seth via cdouglas)

    MAPREDUCE-2575. TestMiniMRDFSCaching fails if test.build.dir is set 
    to something other than build/test (Thomas Graves via mahadev)

    MAPREDUCE-2622. Remove the last remaining reference to the deprecated
    configuration "io.sort.mb". (Harsh J Chouraria via todd)

    MAPREDUCE-2732. Remove directly accessing FSNamesystem.LOG from
    TestCopyFiles and TestDistCh.  (szetszwo)

    MAPREDUCE-2463. Job history files are not moved to done folder when job
    history location is hdfs.  (Devaraj K via szetszwo)

    MAPREDUCE-2243. Close streams propely in a finally-block to avoid leakage
    in CompletedJobStatusStore, TaskLog, EventWriter and TotalOrderPartitioner.
    (Devaraj K via szetszwo)

    MAPREDUCE-2741. Make ant build system work with hadoop-common JAR
    generated by Maven. (Alejandro Abdelnur via tomwhite)

    MAPREDUCE-2760. mapreduce.jobtracker.split.metainfo.maxsize typoed
    in mapred-default.xml. (todd via eli)

    MAPREDUCE-2797. Update mapreduce tests and RAID for HDFS-2239.  (szetszwo)

    MAPREDUCE-2805. Update RAID for HDFS-2241.  (szetszwo)
    
    MAPREDUCE-2837. Ported bug fixes from y-merge to prepare for MAPREDUCE-279
    merge. (acmurthy) 

    MAPREDUCE-2541. Fixed a race condition in IndexCache.removeMap. (Binglin
    Chang via acmurthy) 

    MAPREDUCE-2458. Rename sanitized pom.xml in build directory to work around IDE
    bug (Luke Lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Clear application notification if sent once
    to NodeManager (mahadev)

    MAPREDUCE-2433. YARNApplicationConstants hard code app master jar version (Luke
    Lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Implement restart for resource manager
    phase 1 - Helper classes to store and restore the data structures. (mahadev)

    MAPREDUCE-2414. Change MRv2 to use generic interfaces. (Siddharth Seth via
    acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Implement health-checks for the node -
    server side(ResourceManager) changes. (vinodkv)

    MAPREDUCE-2405: Implement uber-AppMaster (in-cluster LocalJobRunner for MRv2)
    (Greg Roelofs via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Implementing Containers' memory monitoring.
    (vinodkv)

    MAPREDUCE-2440. Name clashes in TypeConverter (luke via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Add fail count to the command line of the
    application master. (mahadev)

    MAPREDUCE-2424. Polish uber-AppMaster: add uber-AM counters and GUI indicators.
    (Greg Roelofs via mahadev)

    MAPREDUCE-2405. Implement uber-AppMaster (in-cluster LocalJobRunner for MRv2).
    (Greg Roelofs and Sharad Agarwal via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix YarnRemoteException to give more
    details. (Siddharth Seth via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. WebApp for Job History (Krishna
    Ramachandran via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Install sanitized poms for downstream
    sanity (Luke Lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Add HistoryCleanerService to Job History
    server. (Krishna Ramachandran via sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Implement 'bin/mapred job -list' and
    'bin/mapred job -list-active-trackers'. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Implement 'bin/mapred queue [-info
    [-showJobs]] [-list] and enhanced 'bin/mapred job -list' to show queue and
    ApplicationMaster information. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed computation of user-limits at
    runtime. (acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. Added functionality to refresh queues at
    runtime via the 'bin/yarn rmadmin' command. (acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. Added functionality to stop/start queues.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Introducing web-UI for NodeManager and
    linking it from RM UI. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix race condition in TestJobHistoryEvents
    and TestJobHistoryParsing. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Add Containers' logs' view to NM UI and
    link it from AM UI. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Add ACLs for queues and command-line
    utilities for viewing them. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Recovery of MR Application Master from
    failures. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Added support High-RAM applications in
    CapacityScheduler. (acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. Completing the ZooKeeper Store for
    ResourceManager state. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Reorient container localization to be
    per-container rather than per-application. (cdouglas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix file creation in
    JobHistoryEventHandler. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Disable ContainerMonitoring for non-linux
    systems. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix container launch w/ inconsistent
    credential file naming. (cdouglas)

    MAPREDUCE-2434. Metrics for ResourceManager. (Luke Lu via acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. RM Restart Phase 2 - Completed the recovery
    of components in the RM (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix to send finish application event only
    when the application is finished (mahadev)

    MAPREDUCE-2462. Write job conf along with JobHistory, other minor improvements.
    (Siddharth Seth via sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Implement 'delay scheduling' for better
    locality in CapacityScheduler and improved high-ram applications. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Implement Job Acls in MR Application
    Master. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Moving userlogs out of container work-dir
    into a separate directory structure. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Completing RM Restart. Completed Phase 3 of
    making sure events are logged and restored (mahadev)

    MAPREDUCE-2468. Add metrics for NM Shuffle. (Luke Lu via cdouglas)

    MAPREDUCE-279. Fix in MR-279 branch. Adding user log handling for YARN. Making
    NM put the user-logs on DFS and providing log-dump tools. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing three tight-loops in RM that are
    causing high cpu-usage. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Replacing FileContext usage with FileSystem
    to work around security authentication issues with FileContext against a secure
    DFS. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Client reconnect to restarted AM. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Fix refreshProxy in ClientServiceDelegate.
    (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Fix Null Pointer in TestUberAM. (sharad) 

    MAPREDUCE-2478. Improve history server. (Siddharth Seth via sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Improved TestJobHistoryEvents and
    TestJobHistoryParsing. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Fix NM to use multiple disks for local
    files and the userlogs. (vinodkv)

    MAPREDUCE-2480: MR App should not depend on hard coded version of shuffle (luke
    lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Propagate error back to client in case of a
    job submission failure (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix assembly to add mapreduce shell scripts
    to the assembly package. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix TestQueueMetrics. (Luke Lu via sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Removal of stale application-log dirs from
    NM local disks. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Add license header and minor cleanup in
    history server. (Siddharth Seth via sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Minor fix for install instructions.
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix a race in MR task that was causing MR
    containers to overwrite each other's job.xml. Also fix leaking attempt-dirs in
    app-local-dir. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Adding valid state to ASM on a finish when
    its already completed and also disble UberAM. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed CS user limits. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed reservation's bad interaction with
    delay scheduling in CS. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Support mapreduce old (0.20) APIs. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Support fail-fast for MR jobs. (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for clearing container requests on an
    AM failure and add tostring methods to taskids and taskattemptids for better
    grep support. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Speed up communication between MR AM and RM
    by relying on a new config rather than AM_EXPIRY_INTERVAL which is too large.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix calculation of maximum capacity to use
    parent's absolute-capacity rather than the leaf queue's absolute-capacity.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing a bug in JobIDPbImpl that's causing
    AM to crash randomly. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix calculation of maximum capacity in
    ParentQueue to use its parent's absolute-capacity rather than its own
    absolute-capacity. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Launching bin/yarn and bin/mapred only
    *once* in AM for constructing classpaths to avoid multiple forks and huge vmem
    usage by AM. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix CapacityScheduler to release unused
    reservations on application completion. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix CapacityScheduler (LeafQueue) to not
    allocate DATA_LOCAL containers when they are not required on the rack.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Makes uber-task disabled by default (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Make logging and memory for AM configurable
    for the user via command line (mahadev) 

    MAPREDUCE-279. Fix in MR-279 branch. Fixing a bug in previous patch (r1103657).
    Now bin/yarn truly shouldn't be launched multiple times in a single AM.
    (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing a bug to do with setting the staging
    dir. (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed Composite Service to shutdown
    services if an error occurs on starting any one of those (mahadev & chris)

    MAPREDUCE-279. Fix in MR-279 branch. Fix the tests to use jvm fork mode to avoid
    errors in shutting down services (sidharth seth)

    MAPREDUCE-2500. PB factories are not thread safe (Siddharth Seth via mahadev) 

    MAPREDUCE-2504. race in JobHistoryEventHandler stop (Siddharth Seth via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix job hang if the AM launch fails.
    (mahadev) 

    MAPREDUCE-2509. Fix NPE in UI for pending attempts. (Luke Lu via mahadev) 

    MAPREDUCE-279. Fix in MR-279 branch. Add junit jar to lib in assembly (mahadev
    and luke)

    MAPREDUCE-279. Fix in MR-279 branch. Distributed cache bug fix to pass Terasort.
    (vinodkv)
     
    MAPREDUCE-279. Fix in MR-279 branch. Fix null pointer exception in kill task
    attempt (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Refactored RMContainerAllocator to release
    unused containers. (sharad) 

    MAPREDUCE-279. Fix in MR-279 branch. Changed Scheduler to return available limit
    to AM in the allocate api. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix nodemanager expiry to not throw OOM.
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Use DefaultContainerExecutor for
    integration tests. (cdouglas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix NPE in test case (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for regression on the scheduling of
    reduces before maps are done (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix distributed-cache related bugs.
    (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Ensure unused containers released by AM are
    correctly counted for queue-capacity. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix TestRuntimeEstimators (Siddharth Seth
    via ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix queue refresh to correctly record newly
    added queues in CapacityScheduler. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Added metrics for tracking reservations in
    CapacityScheduler. (Luke Lu via acmurthy)

    MAPREDUCE-2522. Security for JobHistory service. (Siddharth Seth via mahadev)

    MAPREDUCE-2534. Fix CI breaking hard coded version in jobclient pom. (Luke Lu
    via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Add public cache. (cdouglas)

    MAPREDUCE-279. Fix in MR-279 branch. Made number of RPC server threads
    configurable. (acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. Added acl check for RMAdmin. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Adding job kill for any state that the job
    is in with access control. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Add debug statements for AM not launching
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing race condition leader to hung jobs
    in scheduler negotiator (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Add debug config for delaying delete of
    local files. (cdouglas)

    MAPREDUCE-2527. Metrics for MRAppMaster (Luke lu via mahadev)

    MAPREDUCE-2532. Metrics for NodeManager (Luke Lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed an NPE during handling of unnecessary
    reservations in CS. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for public dist cache to work with non
    default hdfs (mahadev &ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Making streaming -file option work. Also
    minor fixes for successful compilation of contrib tests. (vinodkv)

    MAPREDUCE-2536. Backporting changes to MR-279.

    MAPREDUCE-279. Fix in MR-279 branch. Bugfix for using user staging directory for
    history files (Siddharth Seth via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. First fix for making basic speculative
    execution work (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fixes for TestFail/Kill (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Set correct version of avro-maven-plugin
    that is available in apache maven repositories. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing and reneabling
    TestContainerTokenSecretManager. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Cleaning up configuration constants in
    mapreduce modules. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing NPE on speculator in MRAppMaster and
    making job-history optional in tests to make test goal succeed. (vinodk and
    sharadag).

    MAPREDUCE-279. Fix in MR-279 branch. Fixed NPE in CS by checking Application
    state before scheduling and fixing synchronization in CS. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Making pipes work with YARN. Changed pipes
    to get log-locations from an environmental variable. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Ensure 'lost' NodeManagers are dealt
    appropriately, the containers are released correctly. (acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. Adding some more logging for AM expiry logs
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Reduce ramp up and zero maps support.
    (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Allowing hdfs calls from streaming/pipes
    tasks. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Added ability to decommission nodes and
    completed RM administration tools to achieve parity with JobTracker. (acmurthy) 

    MAPREDUCE-2551. Added JobSummaryLog. (Siddharth Seth via acmurthy)

    MAPREDUCE-2552. Fixed NPE in CompletedJob in JobHistoryServer. (Siddharth Seth
    via acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix reduce slow start. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed TestFifoScheduler. (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix build issue for using yarn.version
    instead of hadoop-mapred.version (mahadev and giri)

    MAPREDUCE-279. Fix in MR-279 branch. Fixes in the handling of KILL events in the
    SUCCEEDED state for tasks in the application master (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for NPE in TestRMNMRPCResponseId.
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix a deadlock in the resourcemanager.
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. NodeStatus.getNodeHealthStatus().setBlah
    broken (Siddharth Seth)

    MAPREDUCE-279. Fix in MR-279 branch. Fix another NPE in TestRMNMRPCResponseId.
    (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for NPE in TestNMExpiry (siddharth
    seth)

    MAPREDUCE-279. Fix in MR-279 branch. Making each node aggregate all its
    user-logs to a separate hdfs file. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix calculation of max-capacity for a
    queue, also fixed a bug in registration of NodeManagers. (acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. More cleaning up constants, removing stale
    code, and making conspicuous the envs that apps depend on to be provided by
    YARN. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix container size rounding in AM and
    headroom in RM. (acmurthy and sharad) 

    MAPREDUCE-279. Fix in MR-279 branch. Disable Job acls until fixed (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix to report job status if the application
    is KILLED/FAILED. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix a corner case in headroom computation -
    now reservations are taken into account and headroom is computed much later to
    account for allocations/reservations. (acmurthy) 

    MAPREDUCE-2537. The RM writes its log to
    yarn-mapred-resourcemanager-<RM_Host>.out (Robert Evans via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix logging for showing the state of job
    (FAILED/KILLED/SUCCEEDED) when it completes (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Re-enabled TestCapacityScheduler.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Support for min and max container capacity.
    (acmurthy and sharad)

    MAPREDUCE-2531. Fixed jobcontrol to downgrade JobID. (Robert Evans via acmurthy) 

    MAPREDUCE-2539. Fixed NPE in getMapTaskReports in JobClient. (Robert Evans via
    acmurthy) 

    MAPREDUCE-279. Fix in MR-279 branch. Fixing the wrong config key used in
    JobHistory that prevented configuring move-thread interval. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed inconsistency in QueueACL enums.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Fix various issues with Web UI's. (Luke Lu)

    MAPREDUCE-279. Fix in MR-279 branch. Fix class cast exception in Task abort for
    old mapreduce apis. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Add deletion of distributed cache
    resources. (cdouglas)

    MAPREDUCE-279. Fix in MR-279 branch. Disable aggregation of logs onto DFS till
    JobHistoryServer starts serving logs. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Cleanup redundant code in TaskAttemptImpl.
    (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Work around broken signaling in public
    cache. (cdouglas)

    MAPREDUCE-2566. YarnConfiguration should reloadConfiguration if instantiated
    with a non YarnConfiguration object. (Siddharth Seth)

    MAPREDUCE-279. Fix in MR-279 branch. Fully resolve paths when launching
    containers. (Siddharth Seth)

    MAPREDUCE-279. Fix in MR-279 branch. Re-enabling Uber-AM feature. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed deadlock during expiring NMs.
    (acmurthy)

    MAPREDUCE-279. Fix in MR-279 branch. Solving NPEs during
    ContainerManager#StopContainer. Also removing the unused
    ContainerManager#CleanupContainer api. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Remove retries in dist cache so that NM's
    do not shutdown (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix classpath construction for Task.
    (vinodkv via sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Sending Job diagnostics from AM to RM and
    redirect to history-url on job completion. (vinodkv and sharadag)

    MAPREDUCE-279. Fix in MR-279 branch. Added clover in pom dependency. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Intermittent TestMRApp failures on faster
    Linux desktop. (Luke lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Including source files in release
    distribution (Luke Lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Intermittent TestMRApp failures on faster
    Linux desktop (part 2) (Luke lu via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Disable Uber AM. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Added few job diagnostic messages. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Add ability to includes src files in
    assembly target for maven (Luke Lu via mahadev)

    MAPREDUCE-2582. Cleanup JobHistory event generation.(Siddharth Seth via sharad)  

    MAPREDUCE-279. Fix in MR-279 branch. Fix rounding off problem in reduce ramp up.
    (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Fix more rounding off problems in reduce
    ramp up. Also fix a bug preventing the application of the cap on reduce ramp-up.
    (Sharad Agarwal via vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fix to exclude images dir into the tar
    distribution (Luke Lu via gkesavan)

    MAPREDUCE-279. Fix in MR-279 branch. Changes a couple of usages of FileContext
    to FileSystem in YarnRunner to handle distributed cache path resolutions on
    non-default filesystems. (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Display failed/killed attempts of the task
    on MR AM UI separately. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Miscellaneous UI fixes + source code
    formatting for MR JobHistoryEventHandler. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing broken link to logs for container on
    NM web UI. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing the bug which was causing FAILED
    jobs to be displayed as COMPLETED on the RM UI. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Job level node blacklisting. (sharad)

    MAPREDUCE-279. Fix in MR-279 branch. Fix NPE in history event handling
    (Siddharth Seth via mahadev)

    MAPREDUCE-2569. Ensure root queue allocated 100% capacity. (Jonathan Eagles via
    cdouglas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix ClassCastException in JobHistoryServer
    for certain jobs. (Siddharth Seth via llu)

    MAPREDUCE-279. Fix in MR-279 branch. Changes for invoking rack resolution in the
    RM and in the AM (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix concurrent modification exception in
    the Capacity Scheduler (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix stopContainer for setsid challenged
    platforms. (llu)

    MAPREDUCE-2587. Generate yarn version for UI. (Thomas Graves via lluts page to
    the history server UI. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Bug fix to set correct state on containers
    so as to avoid duplicate containers from RM to AM. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Hack until MAPREDUCE-2365 is fixed to make
    PIG work with MRV2. (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Changes a couple of usages of FileContext
    to FileSystem in TaskAttemptImpl to handle distributed cache path resolutions on
    non-default filesystems. (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix NPE when requesting attempts for
    completed jobs. (Siddharth Seth via llu)

    MAPREDUCE-279. Fix in MR-279 branch. Improve logging for AM when requesting
    containers to show the right ask and release fields (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix race condition between multiple
    localizers on a single node. (cdouglas via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix RM app start/finish time and
    diagnostics. (llu)

    MAPREDUCE-279. Fix in MR-279 branch. Fix to schedule reduces irrespective of the
    headroom when all maps are done so as to avoid stall in reduce-scheduling when
    slow-start is disabled. (Sharad Agarwal via vinodkv).

    MAPREDUCE-279. Fix in MR-279 branch. Disabling locality-wait in
    CapacityScheduler for now to prevent uber-slow scheduling for apps with no
    data-locality constraints (sleep-job like). (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Fixing scheduling deadlock in AM because of
    incorrect headRoom values from RM. The bug happens when AM releases containers
    and RM decrements current memory usage twice for all those containers. (vinodkv)

    MAPREDUCE-2611. Fix counters, finish times etc. in job history. (Siddharth Seth
    via llu)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for ConcurrentModification exception
    while iterating through tokens in a UGI in ContainerLauncherImpl. (ddas)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for NPE in YarnChild that was causing
    lots of tasks to fail. (vinodkv)

    MAPREDUCE-2615. Make killJob go through AM and fix JobSummaryLog. (Siddharth
    Seth via llu)

    MAPREDUCE-279. Fix in MR-279 branch. Fix class cast exception in release
    reserved containers in capacity scheduler (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix diagnostics display for more than 100
    apps in RM. (llu)

    MAPREDUCE-279. Fix in MR-279 branch. Fix some invalid transitions in the RM.
    (vinodkv via ddas)

    MAPREDUCE-2618. Fix NPE in 0 map 0 reduce jobs. (Jeffrey Naisbitt via llu)

    MAPREDUCE-2625. Add version info to nodemanager info page. (Jonathan Eagles via
    llu)

    MAPREDUCE-279. Fix in MR-279 branch. (1) Faster retries from AM to HistoryServer
    (2) Correct diagnostics for containers. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Major ASM cleanup. Streamlining classes,
    interface and events. (vinodkv)

    MAPREDUCE-279. Fix in MR-279 branch. Reinstate resolve path fixes for viewfs.
    (Siddharth Seth via llu)

    MAPREDUCE-2633. Add a getCounter(Enum) method to the Counters record. (Josh
    Wills via sharad)

    MAPREDUCE-2645. Updates to MRv2 INSTALL and README documentation. (Josh Wills
    via vinodkv)

    MAPREDUCE-2628. Add compiled on date to NM and RM info/about page.

    MAPREDUCE-2400. Remove Cluster's dependency on JobTracker via a ServiceProvider
    for the actual implementation. (tomwhite via acmurthy) 

    MAPREDUCE-2663. Refactoring StateMachineFactory inner classes. (ahmed radwan via
    mahadev)

    MAPREDUCE-2678. minimum-user-limit-percent no longer honored. (naisbitt via
    mahadev)

    MAPREDUCE-2630. refreshQueues leads to NPEs when used w/FifoScheduler. (Josh
    Wills via mahadev)

    MAPREDUCE-2644. NodeManager fails to create containers when NM_LOG_DIR is not
    explicitly set in the Configuration. (Josh Wills via vinodkv)

    MAPREDUCE-2661. Fix TaskImpl to not access MapTaskImpl. (Ahmed Radwan via
    sharad) 

    HADOOP-6929. Backport changes to MR-279 (mahadev and owen)

    HADOOP-6929. Making Security Info abstract and not an interface (mahadev)

    MAPREDUCE-2667. mapred job -kill leaves application in RUNNING state (thomas
    graves via mahadev)

    MAPREDUCE-2664. Implement JobCounters for Mtions as asynchronous. (vinodkv,
    sharad and acmurthy)

    MAPREDUCE-2773. server.api.records.NodeHealthStatus renamed but not updated in
    client NodeHealthStatus.java (Thomas Graves via mahadev)

    MAPREDUCE-2772. Fix MR-279 build after common mavenization. (Robert Joseph Evans
    via llu)

    MAPREDUCE-2772. Fix MR-279 build after common mavenization, part 2. (Thomas
    Graves via llu)

    MAPREDUCE-279. Fix in MR-279 branch. Harmonize slf4j versions. (llu)

    MAPREDUCE-279. Fix in MR-279 branch. Fix NPE in FifoScheduler. (mahadev)

    MAPREDUCE-2776. Fix some of the yarn findbug warnings. (Siddharth Seth via
    mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix findbugs warnings in mr-client modules,
    part 1 (mahadev) 

    MAPREDUCE-279. Fix in MR-279 branch. Fix findbugs warnings in mr-client modules
    part 2 (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix findbugs warnings in mr-client modules
    part 3 (mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix the poms to enable 0.23 snapshots for
    hdfs/common from apache nightly builds (gkesavan)

    MAPREDUCE-279. Fix in MR-279 branch. Fix ivy conf to work with the hadoop common
    trunk maven build changes. (Giridharan Kesavan)

    MAPREDUCE-279. Fix in MR-279 branch. Patch for findbugs warnings in Resource
    Manager (Siddharth Seth via mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fix for running ant targets to use the
    right set of common/test jars (gkesavan via mahadev)

    MAPREDUCE-2782. Unit tests for CapacityScheduler. (acmurthy) 

    MAPREDUCE-2706. Log job submission failures. (Jeffrey Naisbitt via acmurthy) 

    MAPREDUCE-2781. mr279 RM application finishtime not set (Thomas Graves via
    mahadev)

    MAPREDUCE-279. Fix in MR-279 branch. Fixed CS locality wait factor. (acmurthy)

    MAPREDUCE-2808. pull MAPREDUCE-2797 into mr279 branch (Thomas Graves via
    mahadev)

    MAPREDUCE-2639. Bug fixes in speculate.DataStatistics. (Josh Wills via acmurthy)

    MAPREDUCE-2839. Fixed TokenCache to get delegation tokens using both new and old
    apis. (Siddharth Seth via acmurthy)

    MAPREDUCE-2727. Fix divide-by-zero error in SleepJob for sleepCount equals 0.
    (Jeffrey Naisbitt via acmurthy)

    MAPREDUCE-2839. Fixed TokenCache to get delegation tokens using both new
    and old apis. (Siddharth Seth via acmurthy)

    MAPREDUCE-2727. Fix divide-by-zero error in SleepJob for sleepCount equals
    0. (Jeffrey Naisbitt via acmurthy)
 
    MAPREDUCE-2860. Fix log4j logging in the maven test cases. (mahadev)

    MAPREDUCE-2867. Remove Unused TestApplicaitonCleanup in resourcemanager/applicationsmanager.
    (mahadev)

    MAPREDUCE-2868. ant build broken in hadoop-mapreduce dir (mahadev, giri and arun via mahadev)

    MAPREDUCE-2649. Handling of finished applications in RM. (Thomas Graves
    via acmurthy) 

    MAPREDUCE-2838. Fix MapReduce builds to use new hadoop-common test jars.
    (gkesavan via acmurthy) 
   
    MAPREDUCE-2859. Fix eclipse plugin contrib module compilation (gkesavan) 

    MAPREDUCE-2846. Fix missing synchronization in the task log management.
    (omalley)

    MAPREDUCE-2807. Fix AM restart and client redirection. (sharad)

    MAPREDUCE-2877. Add missing Apache license header in some files in MR 
    and also add the rat plugin to the poms. (mahadev)

    MAPREDUCE-2796. Set start times for MR applications for clients to see.
    (Devaraj K via acmurthy) 

    MAPREDUCE-2879. Fix version for MR-279 to 0.23.0. (acmurthy) 
   
    MAPREDUCE-2881. Fix to include log4j 1.2.16 depenency (gkesavan)

    MAPREDUCE-2885. Fix mapred-config.sh to look for hadoop-config.sh in
    HADOOP_COMMON_HOME/libexec. (acmurthy) 

    MAPREDUCE-2893. Remove duplicate entry of YarnClientProtocolProvider in
    ClientProtocolProvider services file. (Liang-Chi Hsieh via acmurthy) 

    MAPREDUCE-2891. Javadoc for AMRMProtocol and related records. (acmurthy)

    MAPREDUCE-2898. Javadoc for ContainerManager protocol and related records. 
    (acmurthy)

    MAPREDUCE-2904. Fixed bin/yarn to correctly include HDFS jars and
    clean up of stale refs to pre-mavenized Hadoop Common and HDFS. 
    (Sharad Agarwal and Arun C. Murthy via acmurthy)

    MAPREDUCE-2737. Update the progress of jobs on client side. (Siddharth Seth
    and Mahadev Konar via mahadev)

    MAPREDUCE-2886. Fix Javadoc warnings in MapReduce. (mahadev)

    MAPREDUCE-2897. Javadoc for ClientRMProtocol protocol and related records. 
    (acmurthy)

    MAPREDUCE-2916. Ivy build for MRv1 fails with bad organization for 
    common daemon. (mahadev)

    MAPREDUCE-2917. Fixed corner case in container reservation which led to
    starvation and hung jobs. (acmurthy) 

    MAPREDUCE-2756. Better error handling in JobControl for failed jobs.
    (Robert Evans via acmurthy) 

    MAPREDUCE-2716. MRReliabilityTest job fails because of missing
    job-file. (Jeffrey Naisbitt via vinodkv)

    MAPREDUCE-2882. TestLineRecordReader depends on ant jars. (todd)

    MAPREDUCE-2687. Fix NodeManager to use the right version of
    LocalDirAllocator.getLocalPathToWrite. (mahadev & acmurthy) 

    MAPREDUCE-2800. Set final progress for tasks to ensure all task information
    is correctly logged to JobHistory. (Siddharth Seth via acmurthy)

    MAPREDUCE-2938. Log application submission failure in CapacityScheduler.
    (acmurthy) 

    MAPREDUCE-2948. Hadoop streaming test failure, post MR-2767 (mahadev)

    MAPREDUCE-2908. Fix all findbugs warnings. (vinodkv via acmurthy) 

    MAPREDUCE-2947. Fixed race condition in AuxiliaryServices. (vinodkv via
    acmurthy) 

    MAPREDUCE-2844. Fixed display of nodes in UI. (Ravi Teja Ch N V via
    acmurthy) 

    MAPREDUCE-2677. Fixed 404 for some links from HistoryServer. (Robert Evans
    via acmurthy) 

    MAPREDUCE-2937. Ensure reason for application failure is displayed to the
    user. (mahadev via acmurthy) 

    MAPREDUCE-2953. Fix a race condition on submission which caused client to 
    incorrectly assume application was gone by making submission synchronous
    for RMAppManager. (Thomas Graves via acmurthy) 

    MAPREDUCE-2963. Fix hang in TestMRJobs. (Siddharth Seth via acmurthy) 

    MAPREDUCE-2954. Fixed a deadlock in NM caused due to wrong synchronization
    in protocol buffer records. (Siddharth Seth via vinodkv)

    MAPREDUCE-2975. Fixed YARNRunner to use YarnConfiguration rather than
    Configuration. (mahadev via acmurthy) 
 
    MAPREDUCE-2971. ant build mapreduce fails protected access jc.displayJobList
    (jobs) (Thomas Graves via mahadev)

    MAPREDUCE-2691. Finishing up the cleanup of distributed cache file resources
    and related tests. (Siddharth Seth via vinodkv)

    MAPREDUCE-2749. Ensure NM registers with RM after starting all its services
    correctly. (Thomas Graves via acmurthy)

    MAPREDUCE-2979. Removed the needless ClientProtocolProvider configuration
    from the hadoop-mapreduce-client-core module. (Siddharth Seth via vinodkv)

    MAPREDUCE-2985. Fixed findbugs warnings in ResourceLocalizationService.
    (Thomas Graves via acmurthy)

    MAPREDUCE-2874. Fix formatting of ApplicationId in web-ui. (Eric Payne via
    acmurthy)

    MAPREDUCE-2995. Better handling of expired containers in MapReduce
    ApplicationMaster. (vinodkv via acmurthy) 

    MAPREDUCE-2995. Fixed race condition in ContainerLauncher. (vinodkv via 
    acmurthy) 

    MAPREDUCE-2949. Fixed NodeManager to shut-down correctly if a service
    startup fails. (Ravi Teja via vinodkv)

    MAPREDUCE-3005. Fix both FifoScheduler and CapacityScheduler to correctly
    enforce locality constraints. (acmurthy) 

    MAPREDUCE-3007. Fixed Yarn Mapreduce client to be able to connect to 
    JobHistoryServer in secure mode. (vinodkv)

    MAPREDUCE-2987. Fixed display of logged user on RM Web-UI. (Thomas Graves
    via acmurthy)

    MAPREDUCE-3006. Fixed MapReduce AM to exit only after properly writing out
    history file. (vinodkv)

    MAPREDUCE-2925. Fixed Yarn+MR client code to behave saner with completed
    jobs. (Devaraj K via vinodkv)

    MAPREDUCE-3030. Fixed a bug in NodeId.equals() that was causing RM to
    reject all NMs. (Devaraj K via vinodkv)

    MAPREDUCE-3042. Fixed default ResourceTracker address. (Chris Riccomini
    via acmurthy) 

    MAPREDUCE-3038. job history server not starting because conf() missing
    HsController (Jeffrey Naisbitt via mahadev)

    MAPREDUCE-3004. Fix ReduceTask to not assume 'local' mode in YARN. (Hitesh
    Shah via acmurthy)

    MAPREDUCE-3017. The Web UI shows FINISHED for killed/successful/failed jobs.
    (mahadev)

    MAPREDUCE-3040. Fixed extra copy of Configuration in
    YarnClientProtocolProvider and ensured MiniMRYarnCluster sets JobHistory
    configuration for tests. (acmurthy) 

    MAPREDUCE-3018. Fixed -file option for streaming. (mahadev via acmurthy) 

    MAPREDUCE-3036. Fixed metrics for reserved resources in CS. (Robert Evans
    via acmurthy)

    MAPREDUCE-2998. Fixed a bug in TaskAttemptImpl which caused it to fork
    bin/mapred too many times. (vinodkv via acmurthy)

    MAPREDUCE-3023. Fixed clients to display queue state correctly. (Ravi
    Prakash via acmurthy) 

    MAPREDUCE-2970. Fixed NPEs in corner cases with different configurations
    for mapreduce.framework.name. (Venu Gopala Rao via vinodkv)

    MAPREDUCE-3062. Fixed default RMAdmin address. (Chris Riccomini
    via acmurthy) 

    MAPREDUCE-3066. Fixed default ResourceTracker address for the NodeManager. 
    (Chris Riccomini via acmurthy) 

    MAPREDUCE-3044. Pipes jobs stuck without making progress. (mahadev)

    MAPREDUCE-2754. Fixed MR AM stdout, stderr and syslog to redirect to
    correct log-files. (Ravi Teja Ch N V via vinodkv)

    MAPREDUCE-3073. Fixed build issues in MR1. (mahadev via acmurthy)

    MAPREDUCE-2691. Increase threadpool size for launching containers in
    MapReduce ApplicationMaster. (vinodkv via acmurthy)


    MAPREDUCE-2990. Fixed display of NodeHealthStatus. (Subroto Sanyal via
    acmurthy) 

    MAPREDUCE-3053. Better diagnostic message for unknown methods in ProtoBuf
    RPCs. (vinodkv via acmurthy)

    MAPREDUCE-2952. Fixed ResourceManager/MR-client to consume diagnostics
    for AM failures in a couple of corner cases. (Arun C Murthy via vinodkv)

    MAPREDUCE-3064. 27 unit test failures with Invalid 
    "mapreduce.jobtracker.address" configuration value for 
    JobTracker: "local" (Venu Gopala Rao via mahadev)

    MAPREDUCE-3090. Fix MR AM to use ApplicationAttemptId rather than
    (ApplicationId, startCount) consistently. (acmurthy)  

    MAPREDUCE-2646. Fixed AMRMProtocol to return containers based on
    priority. (Sharad Agarwal and Arun C Murthy via vinodkv)

    MAPREDUCE-3031. Proper handling of killed containers to prevent stuck
    containers/AMs on an external kill signal. (Siddharth Seth via vinodkv)

    MAPREDUCE-2984. Better error message for displaying completed containers.
    (Devaraj K via acmurthy)

    MAPREDUCE-3071. app master configuration web UI link under the Job menu 
    opens up application menu. (thomas graves  via mahadev)

    MAPREDUCE-3067. Ensure exit-code is set correctly for containers. (Hitesh
    Shah via acmurthy)

    MAPREDUCE-2999. Fix YARN webapp framework to properly filter servlet
    paths. (Thomas Graves via vinodkv)

    MAPREDUCE-3095. fairscheduler ivy including wrong version for hdfs.
    (John George via mahadev)

    MAPREDUCE-3054. Unable to kill submitted jobs. (mahadev)

    MAPREDUCE-3021. Change base urls for RM web-ui. (Thomas Graves via
    acmurthy) 

    MAPREDUCE-3041. Fixed ClientRMProtocol to provide min/max resource
    capabilities along-with new ApplicationId for application submission.
    (Hitesh Shah via acmurthy)

    MAPREDUCE-2843. Fixed the node-table to be completely displayed and making
    node entries on RM UI to be sortable. (Abhijit Suresh Shingate via vinodkv)

    MAPREDUCE-3110. Fixed TestRPC failure. (vinodkv)

    MAPREDUCE-3078. Ensure MapReduce AM reports progress correctly for
    displaying on the RM Web-UI. (vinodkv via acmurthy)

    MAPREDUCE-3114. Fixed invalid ApplicationURL on RM WebUI. (Subroto Sanyal
    via vinodkv)

    MAPREDUCE-2791. Added missing info on 'job -status' output. (Devaraj K via
    acmurthy)

    MAPREDUCE-2996. Add uber-ness information to JobHistory. (Jonathan Eagles
    via acmurthy)

    MAPREDUCE-3050. Add ability to get resource usage information for
    applications and nodes. (Robert Evans via acmurthy) 

    MAPREDUCE-3113. Ensure bin/yarn and bin/yarn-daemon.sh identify the root
    of the install properly. (Xie Xianshan via acmurthy) 

    MAPREDUCE-3137. Fix broken merge of MAPREDUCE-2179. (Hitesh Shah via
    acmurthy) 

    MAPREDUCE-2792. Replace usage of node ip-addresses with hostnames.
    (vinodkv via acmurthy) 

    MAPREDUCE-3112. Fixed recursive sourcing of HADOOP_OPTS environment
    variable. (Eric Yang)

    MAPREDUCE-3056. Changed the default staging directory to not include
    user.name to prevent issues with non-secure mode. (Devaraj K via vinodkv)

    MAPREDUCE-2913. Fixed TestMRJobs.testFailingMapper to assert the correct
    TaskCompletionEventStatus. (Jonathan Eagles via vinodkv)

    MAPREDUCE-2794. [MR-279] Incorrect metrics value for AvailableGB per 
    queue per user. (John George via mahadev)

    MAPREDUCE-2783. Fixing RM web-UI to show no tracking-URL when AM
    crashes. (Eric Payne via vinodkv)

    MAPREDUCE-3141. Fix the broken MRAppMaster to work over YARN in security
    mode.(vinodkv)

    MAPREDUCE-2751. Modified NodeManager to stop leaving around local files
    after application finishes. (Siddharth Seth via vinodkv)

    MAPREDUCE-3033. Ensure Master interface pays attention to classic v/s yarn
    frameworks. (Hitesh Shah via acmurthy)

    MAPREDUCE-2802. Ensure JobHistory filenames have jobId. (Jonathan Eagles
    via acmurthy) 

    MAPREDUCE-2876. Use a different config for ContainerAllocationExpirer.
    (Anupam Seth via acmurthy) 

    MAPREDUCE-3153. Fix TestFileOutputCommitter which was broken by
    MAPREDUCE-2702. (mahadev via acmurthy) 

    MAPREDUCE-3123. Fix NM to quote symlink names to escape special
    characters. (Hitesh Shah via acmurthy) 

    MAPREDUCE-3154. Fix JobSubmitter to check for output specs before copying
    job submission files to fail fast. (Abhijit Suresh Shingate via acmurthy) 

    MAPREDUCE-3158. Fix test failures in MRv1 due to default framework being
    set to yarn. (Hitesh Shah via acmurthy)

    MAPREDUCE-3167. container-executor is not being packaged with the assembly
    target. (mahadev)

    MAPREDUCE-3020. Fixed TaskAttemptImpl to log the correct node-address for
    a finished Reduce task. (Chackaravarthy via vinodkv)

    MAPREDUCE-2668. Fixed AuxServices to send a signal on application-finish
    to all the services. (Thomas Graves via vinodkv)

    MAPREDUCE-3126. Fixed a corner case in CapacityScheduler where headroom
    wasn't updated on changes to cluster size. (acmurthy) 

    MAPREDUCE-3140. Fixed the invalid JobHistory URL for failed
    applications. (Subroto Sanyal via vinodkv)

    MAPREDUCE-3125. Modified TaskImpl to consider only non-failed, non-killed
    task-attempts for obtaining task's progress. (Hitesh Shah via vinodkv)

    MAPREDUCE-2666. Retrieve shuffle port number from JobHistory on MR AM
    restart. (Jonathan Eagles via acmurthy) 

    MAPREDUCE-2789. Complete schedulingInfo on CLI. (Eric Payne via acmurthy) 

    MAPREDUCE-3170. Fixed job output commit for deep hierarchies. (Hitesh Shah
    via acmurthy)

    MAPREDUCE-3124. Fixed location of native libs i.e. libhadoop.so for
    containers. (John George via acmurthy) 

    MAPREDUCE-3057. Job History Server goes of OutOfMemory with 1200 Jobs 
    and Heap Size set to 10 GB. (Eric Payne via mahadev)

    MAPREDUCE-2840. mr279 TestUberAM.testSleepJob test fails. (jonathan eagles
    via mahadev)

    MAPREDUCE-3190. Ensure bin/yarn fails early with a clear error message
    when HADOOP_COMMON_HOME or HADOOP_HDFS_HOME are not set. (todd & acmurthy 
    via acmurthy)

    MAPREDUCE-3189. Add link decoration back to MR2's CSS. (Todd Lipcon via
    mahadev)
    
    MAPREDUCE-3127. Changed default value of yarn.resourcemanager.acl.enable
    to true and added some more documentation. (acmurthy) 

    MAPREDUCE-3032. Fixed TaskAttemptImpl so that JobHistory can have error
    information about failed tasks. (Devaraj K via vinodkv)

    MAPREDUCE-3196. TestLinuxContainerExecutorWithMocks fails on Mac OSX.
    (Arun Murthy via mahadev)

    MAPREDUCE-3197. TestMRClientService failing on building clean checkout of 
    branch 0.23 (mahadev)

    MAPREDUCE-2762. Cleanup MR staging directory on completion. (mahadev via
    acmurthy) 

    MAPREDUCE-3165. Ensure logging options are set correctly for MR AM and
    tasks. (todd via acmurthy) 

    MAPREDUCE-3203. Fix some javac warnings in MRAppMaster. (mahadev)

    MAPREDUCE-3162. Separated application-init and container-init event types
    in NodeManager's Application state machine. (Todd Lipcon via vinodkv)

    MAPREDUCE-3176. Fixed ant mapreduce tests that are timing out because
    of wrong framework name. (Hitesh Shah via vinodkv)

    MAPREDUCE-3181. Fixed MapReduce runtime to load yarn-default.xml and
    yarn-site.xml. (acmurthy) 

    MAPREDUCE-2788. Normalize resource requests in FifoScheduler
    appropriately. (Ahmed Radwan via acmurthy) 

    MAPREDUCE-2693. Fix NPE in job-blacklisting. (Hitesh Shah via acmurthy) 

    MAPREDUCE-3208. Fix NPE task/container log appenders. (liangzhwa via
    acmurthy) 

    MAPREDUCE-3212. Fix usage/help message for bin/yarn. (Bhallamudi Venkata 
    Siva Kamesh via acmurthy) 

    MAPREDUCE-3179. Ensure failed tests exit with right error code. (Jonathan
    Eagles via acmurthy)

    MAPREDUCE-3188. Ensure correct shutdown in services. (todd via acmurthy) 

    MAPREDUCE-3226. Fix shutdown of fetcher threads. (vinodkv via acmurthy) 

    MAPREDUCE-3070. Fix NodeManager to use ephemeral ports by default.
    (Devaraj K via acmurthy) 

    MAPREDUCE-3242. Trunk compilation broken with bad interaction from 
    MAPREDUCE-3070 and MAPREDUCE-3239. (mahadev)

    MAPREDUCE-3058. Fixed MR YarnChild to report failure when task throws an
    error and thus prevent a hanging task and job. (vinodkv)

    MAPREDUCE-3087. Fixed the mapreduce classpath to correctly include the
    generated-classpath file needed for tests. (Ravi Prakash via vinodkv)

    MAPREDUCE-3233. Fixed a bug in MR Job so as to be able to restart the
    application on AM crash. (Mahadev Konar via vinodkv)

    MAPREDUCE-3028. Added job-end notification support. (Ravi Prakash via
    acmurthy) 

    MAPREDUCE-3249. Ensure shuffle-port is correctly used duringMR AM recovery. 
    (vinodkv via acmurthy) 

    MAPREDUCE-3252. Fix map tasks to not rewrite data an extra time when
    map output fits in spill buffer. (todd)

    MAPREDUCE-3159. Ensure DefaultContainerExecutor doesn't delete application
    directories during app-init. (todd via acmurthy)

    MAPREDUCE-2746. Yarn servers can't communicate with each other with 
    hadoop.security.authorization set to true (acmurthy via mahadev)

    MAPREDUCE-2821. Added missing fields (resourcePerMap & resourcePerReduce)
    to JobSummary logs. (mahadev via acmurthy)

    MAPREDUCE-3253. Fixed ContextFactory to clone JobContext correctly.
    (acmurthy) 

    MAPREDUCE-3263. Fixed the MAPREDUCE-3028 commit which broke MR1. (Hitesh
    Shah via acmurthy) 

    MAPREDUCE-3269. Fixed log4j properties to correctly set logging options
    for JobHistoryServer vis-a-vis JobSummary logs. (mahadev via acmurthy) 

    MAPREDUCE-3250. When AM restarts, client keeps reconnecting to the new AM 
    and prints a lots of logs. (vinodkv via mahadev)

    MAPREDUCE-3254. Fixed streaming to set the job.jar by using the right
    JobConf ctor. (acmurthy) 

    MAPREDUCE-3264. mapreduce.job.user.name needs to be set automatically.
    (acmurthy via mahadev)

    MAPREDUCE-3175. Add authorization to admin web-pages such as /stacks, /jmx
    etc. (Jonathan Eagles via acmurthy)

    MAPREDUCE-3257. Added authorization checks for the protocol between
    ResourceManager and ApplicationMaster. (vinodkv via acmurthy) 

    MAPREDUCE-3259. Added java.library.path of NodeManager to
    ContainerLocalizer in LinuxContainerExecutor. (Kihwal Lee via acmurthy) 

    MAPREDUCE-3279. Fixed TestJobHistoryParsing which assumed user name to be
    mapred all the time. (Siddharth Seth via acmurthy)

    MAPREDUCE-3240. Fixed NodeManager to be able to forcefully cleanup its
    containers (process-trees) irrespective of whether the container succeeded,
    or killed. Contributed by Hitesh Shah.

    MAPREDUCE-3281. Fixed a bug in TestLinuxContainerExecutorWithMocks. (vinodkv)

    MAPREDUCE-3228. Fixed MR AM to timeout RPCs to bad NodeManagers. (vinodkv
    via acmurthy)

    MAPREDUCE-3284. Moved JobQueueClient to hadoop-mapreduce-client-core.
    (acmurthy) 

    MAPREDUCE-3282. bin/mapred job -list throws exception. (acmurthy via 
    mahadev)

    MAPREDUCE-3186. User jobs are getting hanged if the Resource manager
    process goes down and comes up while job is getting executed. 
    (Eric Payne via mahadev)

    MAPREDUCE-3285. Tests on branch-0.23 failing (Siddharth Seth via mahadev)

    MAPREDUCE-3258. Fixed AM & JobHistory web-ui to display counters properly.
    (Siddharth Seth via acmurthy)

    MAPREDUCE-3290. Fixed a NPE in ClientRMService. (acmurthy) 

    MAPREDUCE-3185. RM Web UI does not sort the columns in some cases.
    (Jonathan Eagles via mahadev)

    MAPREDUCE-3292. In secure mode job submission fails with Provider 
    org.apache.hadoop.mapreduce.security.token.JobTokenIndentifier$Renewer 
    not found. (mahadev)

    MAPREDUCE-3296. Fixed the remaining nine FindBugs warnings. (vinodkv)

    MAPREDUCE-2775. Fixed ResourceManager and NodeManager to force a
    decommissioned node to shutdown. (Devaraj K via vinodkv)

    MAPREDUCE-3304. Fixed intermittent test failure due to a race in
    TestRMContainerAllocator#testBlackListedNodes. (Ravi Prakash via acmurthy) 

    MAPREDUCE-3306. Fixed a bug in NodeManager ApplicationImpl that was causing
    NodeManager to crash. (vinodkv)

    MAPREDUCE-3295. TestAMAuthorization failing on branch 0.23. (vinodkv via mahadev)

    MAPREDUCE-3183. hadoop-assemblies/src/main/resources/assemblies/hadoop-mapreduce-dist.xml
    missing license header. (Hitesh Shah via tucu).

    MAPREDUCE-3003. Publish MR JARs to Maven snapshot repository. (tucu)

    MAPREDUCE-3199. Fixed pom files to include correct log4j configuration for
    tests. (vinodkv)

    MAPREDUCE-3204. mvn site:site fails on MapReduce. (tucu)

    MAPREDUCE-3248. Fixed log4j properties. (vinodkv via acmurthy)

    MAPREDUCE-3256. Added authorization checks for the protocol between
    NodeManager and ApplicationMaster. (vinodkv via acmurthy) 

    MAPREDUCE-3274. Fixed a race condition in MRAppMaster that was causing a
    task-scheduling deadlock. (Robert Joseph Evans via vinodkv)

    MAPREDUCE-3171 merge from trunk reverted changes from MAPREDUCE-2747 MAPREDUCE-3240.

    MAPREDUCE-3313. Fixed initialization of ClusterMetrics which was failing
    TestResourceTrackerService sometimes. (Hitesh Shah via vinodkv)

    MAPREDUCE-2766. Fixed NM to set secure permissions for files and directories
    in distributed-cache. (Hitesh Shah via vinodkv)

    MAPREDUCE-2696. Fixed NodeManager to cleanup logs in a thread when logs'
    aggregation is not enabled. (Siddharth Seth via vinodkv)

    MAPREDUCE-3262. Fixed Container's state-machine in NodeManager to handle
    a couple of events in failure states correctly. (Hitesh Shah and Siddharth
    Seth via vinodkv)

    MAPREDUCE-3035. Fixed MR JobHistory to ensure rack information is present.
    (chakravarthy via acmurthy)

    MAPREDUCE-3321. Disabled a few MR tests for 0.23. (Hitesh Shah via
    acmurthy) 

    MAPREDUCE-3220. Fixed TestCombineOutputCollector. (Devaraj K via acmurthy) 

    MAPREDUCE-3103. Implement Job ACLs for MRAppMaster. 
    (mahadev)
    
    MAPREDUCE-3241. [Rumen] Fix Rumen to ignore the AMStartedEvent. (amarrk)

    MAPREDUCE-3166. [Rumen] Make Rumen use job history api instead of relying
    on current history file name format. (Ravi Gummadi via amarrk)

    MAPREDUCE-3157. [Rumen] Fix TraceBuilder to handle 0.20 history file
                    names also. (Ravi Gummadi via amarrk)

    MAPREDUCE-3081. Fix vaidya startup script. (gkesavan via suhas).

    MAPREDUCE-2764. Fix renewal of dfs delegation tokens. (Owen via jitendra)

    MAPREDUCE-3192. Fix Javadoc warning in JobClient.java and Cluster.java.
    (jitendra)

    MAPREDUCE-3237. Move LocalJobRunner to hadoop-mapreduce-client-core.
    (tomwhite via acmurthy) 

    MAPREDUCE-3316. Rebooted link is not working properly. 
    (Bhallamudi Venkata Siva Kamesh via mahadev)

    MAPREDUCE-3317. Rumen TraceBuilder is emiting null as hostname.
    (Ravi Gummadi via mahadev)

    MAPREDUCE-3332. contrib/raid compile breaks due to changes in hdfs/protocol/datatransfer/
    Sender#writeBlock related to checksum handling (Hitesh Shah via mahadev)

    MAPREDUCE-3337. Added missing license headers. (acmurthy) 
    
Release 0.22.1 - Unreleased

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    MAPREDUCE-3837. Job tracker is not able to recover jobs after crash.
    (Mayank Bansal via shv) 

Release 0.22.0 - 2011-11-29

  INCOMPATIBLE CHANGES

    MAPREDUCE-1866. Removes deprecated class
    org.apache.hadoop.streaming.UTF8ByteArrayUtils. (amareshwari)

    MAPREDUCE-1664. Changes the behaviour of the combination of job-acls
    when they function together with queue-acls. (Ravi Gummadi via vinodkv)

    MAPREDUCE-2994. Fixed a bug in ApplicationID parsing that affects RM
    UI. (Devaraj K via vinodkv)

    MAPREDUCE-1788. o.a.h.mapreduce.Job shouldn't make a copy of the JobConf.
    (Arun Murthy via mahadev)

  NEW FEATURES

    MAPREDUCE-1804. Stress-test tool for HDFS introduced in HDFS-708.
    (Joshua Harlow via shv)

    MAPREDUCE-220. Collect cpu and memory statistics per task. (Scott Chen via
    acmurthy)

    MAPREDUCE-1970.  Reed-Solomon code implementation for HDFS RAID.
    (Scott Chen via dhruba)

    MAPREDUCE-2169. Integrated Reed-Solomon code with RaidNode. (Ramkumar
    Vadali via schen)

    MAPREDUCE-2936. Contrib Raid compilation broken after HDFS-1620. (vinodkv)

  IMPROVEMENTS

    MAPREDUCE-2141. Add an "extra data" field to Task for use by Mesos. (matei)

    MAPREDUCE-2140. Regenerate fair scheduler design doc PDF. (matei)

    MAPREDUCE-1546. Redirect all job pages to corresponding history page
    if job is not in JT memory. (Scott Chen via sharad)

    MAPREDUCE-1092. Enable assertions for unit tests. (Eli Collins via
    cdouglas)

    MAPREDUCE-1680. Add a metric recording JobTracker heartbeats processed.
    (Dick King via cdouglas)

    MAPREDUCE-1761. FairScheduler allows separate configuration of node
    and rack locality wait time (Scott Chen via dhruba)

    MAPREDUCE-1539. authorization checks for inter-server protocol
    (based on HADOOP-6600) (Boris Shkolnik via shv)

    MAPREDUCE-1798. Names the configuration keys for the Kerberos
    principals better. (Boris Shkolnik via ddas)

    MAPREDUCE-1773. streaming doesn't support jobclient.output.filter.
    (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-1785. Add streaming config option for not emitting the key.
    (Eli Collins via sharad)

    MAPREDUCE-572. If #link is missing from uri format of -cacheArchive
    then streaming does not throw error. (Amareshwari Sriramadasu via
    vinodkv)

    MAPREDUCE-1545. Add timestamps for first task type launched in job summary.
    (Luke Lu via cdouglas)

    MAPREDUCE-1543. Add an audit log for authentication events. (Amar Kamat and
    Luke Lu via cdouglas)

    MAPREDUCE-1762. Add ability to set values of task counters. (Scott Chen via
    cdouglas)

    MAPREDUCE-1533. Reduce overhead of logging and string manipulation during
    heartbeat processing. (Amar Kamat and Dick King via cdouglas)

    MAPREDUCE-1516. JobTracker issues delegation tokens only if the user's
    authentication is Kerberos. (Jitendra Pandey via ddas)

    MAPREDUCE-647. Update distcp forrest documentation to reflect the changes
    of HADOOP-5472, MAPREDUCE-642 and HADOOP-5620.  (Rodrigo Schmidt via
    szetszwo)

    MAPREDUCE-1851. Documents configuration parameters in streaming.
    (amareshwari)
    
    MAPREDUCE-1868. Add a read and connection timeout to JobClient while
    pulling tasklogs. (Krishna Ramachandran via acmurthy)

    MAPREDUCE-1778. Ensure failure to setup CompletedJobStatusStore is not
    silently ignored by the JobTracker. (Krishna Ramachandran via acmurthy)

    MAPREDUCE-1850. Includes job submit host information (name and ip) in
    jobconf and jobdetails display (Krishna Ramachandran via amareshwari)

    MAPREDUCE-1893. Slive with multiple reducers. (shv)

    MAPREDUCE-1248. Fixes redudant memory copying in StreamKeyValUtil.
    (Ruibang He via amareshwari)

    MAPREDUCE-1840. Enhancements to Gridmix benchmark simulating user
    diversity, queue replay, and task duration for JobTracker load testing.
    Also includes compatibility with security enhancements, and scalability
    improvements. (Amar Kamat, Rahul Singh, Hong Tang, and cdouglas)

    MAPREDUCE-1848. Put number of speculative, data local, rack local 
    tasks in JobTracker metrics. (Scott Chen via dhruba)

    MAPREDUCE-1935. Makes the Distcp to work in a secure environment.
    (Boris Shkolnik via ddas)

    MAPREDUCE-1945. The MapReduce component for HADOOP-6632.
    (Kan Zhang & Jitendra Pandey via ddas)

    MAPREDUCE-1936. Modify Gridmix3 to support more tunable parameters for
    stress submission and sleep jobs. (Hong Tang via cdouglas)

    MAPREDUCE-1733. Makes pipes applications secure. (Jitendra Pandey via ddas)

    MAPREDUCE-1566. Adds a configuration attribute using which job clients can
    specify a credentials file. The tokens from there will be passed to the job.
    (Jitendra Pandey and Owen O'Malley via ddas)

    MAPREDUCE-1624. Documents the job credentials and associated details to do 
    with delegation tokens (on the client side). 
    (Jitendra Pandey and Devaraj Das via ddas)

    MAPREDUCE-1834. TestSimulatorDeterministicReplay timesout on trunk.
    (Hong Tang via mahadev)

    MAPREDUCE-1993. Fixes test failure
    TestTrackerDistributedCacheManagerWithLinuxTaskController. (Devaraj Das
    via amareshwari)

    MAPREDUCE-1523. Making Mumak work with Capacity-Scheduler (Anirban Das
    via mahadev)

    MAPREDUCE-1920. Enables completed jobstatus store by default. (Tom White
    via amareshwari)

    MAPREDUCE-1881. Improve TaskTrackerInstrumentation to enable collection of
    advanced metrics. (Matei Zaharia via acmurthy)

    MAPREDUCE-1548. Hadoop archives preserve times and other properties from 
    original files. (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1517. Supports streaming job to run in the background. (Bochun Bai
    via amareshwari)

    MAPREDUCE-1819. RaidNode is now smarter in submitting Raid jobs. (Ramkumar
    Vadali via schen)

    MAPREDUCE-2132. A command line option in RaidShell to fix blocks using raid

    MAPREDUCE-2147. Remove redundant lines in JobInProgress ctor.
    (Harsh J Chouraria via cutting)
   
    HADOOP-7007. Update the hudson-test-patch ant target to work with the
    latest test-patch.sh script (gkesavan)

    MAPREDUCE-1818. RaidNode can specify scheduling parameters. (Ramkumar
    Vadali via schen)

    MAPREDUCE-2051. Contribute a fair scheduler preemption system test.
    (Todd Lipcon via tomwhite)

    MAPREDUCE-1892. RaidNode can allow layered policies more efficiently.
    (Ramkumar Vadali via schen)

    MAPREDUCE-1592. Generate Eclipse's .classpath file from Ivy config. 
    (tomwhite via nigel)

    MAPREDUCE-2073. TestTrackerDistributedCacheManager should be up-front
    about requirements on build environment. (Todd Lipcon via tomwhite)

    MAPREDUCE-2093. Herriot JT and TT clients should vend statistics. (cos)

    MAPREDUCE-2167. Faster directory traversal for raid node. (Ramkumar Vadali
    via schen)

    MAPREDUCE-1931. Gridmix forrest documentation . (Ranjit Mathew via vinodkv).

    MAPREDUCE-2184. Port DistRaid.java to new mapreduce API. (Ramkumar Vadali
    via schen)

    MAPREDUCE-1878. Add MRUnit documentation. (Aaron Kimball via tomwhite)

    MAPREDUCE-2180. Add coverage of fair scheduler servlet to system test (todd)

    MAPREDUCE-2250. Fix logging in raid code. (Ramkumar Vadali via schen)

    MAPREDUCE-2260. Remove auto-generated native build files. (rvs via eli)

    MAPREDUCE-2314. configure files that are generated as part of the released
    tarball need to have executable bit set (rvs via cos)

    MAPREDUCE-1159.  Limit Job name in web UI to be 80 char long.  (Harsh J
    Chouraria via szetszwo)

    MAPREDUCE-2337. Remove dependence of public MapReduce API on classes in
    server package. (tomwhite)

    MAPREDUCE-2383. Improve documentation of DistributedCache methods (Harsh J
    Chouraria via todd)

    MAPREDUCE-2222. Ivy resolve force mode should be turned off by default.
    (Luke Lu via tomwhite)

    MAPREDUCE-2103. task-controller shouldn't require o-r permissions.
    (todd via eli)

    MAPREDUCE-2505. Explain how to use ACLs in the fair scheduler.
    (matei via eli)

    MAPREDUCE-3138. Add a utility to help applications bridge changes in 
    Context Objects APIs due to MAPREDUCE-954. (omalley via acmurthy)

  OPTIMIZATIONS

    MAPREDUCE-1354. Enhancements to JobTracker for better performance and
    scalability. (Arun C. Murthy & Richard King via acmurthy) 

    MAPREDUCE-1829. JobInProgress.findSpeculativeTask should use min() to
    find the candidate instead of sort(). (Scott Chen via vinodkv)

  BUG FIXES

    MAPREDUCE-1845. FairScheduler.tasksToPreempt() can return negative number.
    (Scott Chen via matei)

    MAPREDUCE-1707. TaskRunner can get NPE in getting ugi from TaskTracker.
    (Vinod Kumar Vavilapalli)
    
    MAPREDUCE-1532. Ensures that delegation tokens is obtained as the
    actual user when the proxy-user is used for submitting jobs. Also
    refactors the DelegationTokenToRenew class. (ddas)

    MAPREDUCE-1558. Fixes MRAdmin to look up the principal of the 
    JobTracker and use that in the RefreshUserToGroupsMapping protocol and
    RefreshAuthorizationPolicyProtocol. (Boris Shkolnik via ddas)

    MAPREDUCE-1662. Remove unused methods from TaskRunner. (Amareshwari
    Sriramadasu via cdouglas)

    MAPREDUCE-1617. Use IPv4 stack for unit tests. (Amar Kamat and Luke Lu via
    cdouglas)

    MAPREDUCE-1599. Fixes MRBench so that it reuses tokens across jobs
    correctly. (Jitendra Nath Pandey via ddas)

    MAPREDUCE-1836. Refresh for proxy superuser config (mr part for HDFS-1096).
    (Boris Shkolnik via shv)

    MAPREDUCE-1505. Create RPC client on job submission, not in cstr of Job
    instance. (Dick King via cdouglas)

    MAPREDUCE-1813. NPE in PipeMapred.MRErrorThread. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1225. Fixes DistributedCache to check if the file is fresh or not,
    for the first localization also. (Zhong Wang via amareshwari)

    MAPREDUCE-1559. Fixes the token renewer to use the JobTracker's 
    credentials for talking to the NameNode. (ddas)

    MAPREDUCE-1492. Delete  obsolete har files used on the parity files
    of hdfs raid. (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1857. Removes unused configuration parameters in streaming.
    (amareshwari)

    MAPREDUCE-1887. MRAsyncDiskService now properly absolutizes volume root
    paths. (Aaron Kimball via zshao)

    MAPREDUCE-1863. Fix NPE in Rumen when processing null CDF for failed task
    attempts. (Amar Kamat via cdouglas)

    MAPREDUCE-1864. Removes uninitialized/unused variables in
    org.apache.hadoop.streaming.PipeMapRed. (amareshwari)

    MAPREDUCE-1888. Fixes Streaming to override output key and value types, 
    only if mapper/reducer is a command. (Ravi Gummadi via amareshwari)

    MAPREDUCE-577. Fixes duplicate records in StreamXmlRecordReader.
    (Ravi Gummadi via amareshwari)

    MAPREDUCE-1894. Fixed a bug in DistributedRaidFileSystem.readFully() 
    that was causing it to loop infinitely. (Ramkumar Vadali via dhruba)

    MAPREDUCE-1838. Reduce the time needed for raiding a bunch of files
    by randomly assigning files to map tasks. (Ramkumar Vadali via dhruba)

    MAPREDUCE-1820. Fix InputSampler to clone sampled keys. (Alex Kozlov via
    cdouglas)

    MAPREDUCE-1528. Incorporates the changes to the credentials API done in
    HADOOP-6845. Also, introduces Credentials in JobConf, and in JobContext.
    (Jitendra Pandey and Arun Murthy via ddas)

    MAPREDUCE-1865. Rumen should also support jobhistory files generated using
    trunk. (Amar Kamat via amareshwari)

    MAPREDUCE-1621. Fixes NPE in TextOutputReader.getLastOutput if it has never
    read any output. (amareshwari)

    MAPREDUCE-1911. Fixes errors in -info message in streaming. (amareshwari) 

    MAPREDUCE-1772. Corrects errors in streaming documentation in forrest.
    (amareshwari)

    MAPREDUCE-1925. Fix failing TestRumenJobTraces. (Ravi Gummadi via cdouglas)

    MAPREDUCE-1718. Fixes a bug in the construction of jobconf key for the
    mapping that the tasks use at runtime for looking up delegation tokens.
    (Boris Shkolnik via ddas)

    MAPREDUCE-1701. Fixes a problem to do with exception handling in 
    delegation-token renewals. (Boris Shkolnik via ddas)

    MAPREDUCE-1686. Fixes StreamUtil.goodClassOrNull to find classes without
    package names. (Paul Burkhardt via amareshwari)

    MAPREDUCE-1288. Fixes TrackerDistributedCacheManager to take into account
    the owner of the localized file in the mapping from cache URIs to
    CacheStatus objects. (ddas)

    MAPREDUCE-1982. Fixes Rumen's TraceBuilder to extract job name from either 
    of configuration properties "mapreduce.job.name" and "mapred.job.name".
    (Ravi Gummadi via amareshwari)

    MAPREDUCE-1958. The MapReduce part corresponding to the HADOOP-6873.
    (Boris Shkolnik & Owen O'Malley via ddas)

    MAPREDUCE-1900. TaskTracker and JobTracker closes FileSystems, opened on
    behalf of users that it no longer requires. (Kan Zhang and ddas via ddas)

    MAPREDUCE-1992. Fixes a problem to do with bringing up the JobTracker in
    unsecure mode. (Kan Zhang via ddas)

    MAPREDUCE-1999. Fixes ClientProtocol to use the correct 
    DelegationTokenSelector. (Jitendra Pandey via ddas)

    MAPREDUCE-1780. AccessControlList.toString() is used for serialization of
    ACL in JobStatus.java. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1961. Fix ConcurrentModificationException in Gridmix during
    shutdown. (Hong Tang via cdouglas)

    MAPREDUCE-2000. Fix parsing of JobHistory lines in Rumen when quotes are
    escaped. (Hong Tang via cdouglas)

    MAPREDUCE-2022. Fixes compilation errors in TestSubmitJob. (amareshwari)

    MAPREDUCE-1670. RAID policies should not scan their own destination path.
    (Ramkumar Vadali via dhruba)

    MAPREDUCE-1668. RaidNode Hars a directory only if all its parity files 
    have been created. (Ramkumar Vadali via dhruba)

    MAPREDUCE-2021. Fixes duplicate hostnames in CombineFileInputFormat's
    split locations. (amareshwari)

    MAPREDUCE-1375. Fixes flaky test TestFileArgs. (Todd Lipcon via
    amareshwari)

    MAPREDUCE-2023. TestDFSIO should not stop reading if curSize != bufferSize.
    (Hong Tang via szetszwo)

    MAPREDUCE-2031. Fixes test failures TestTaskLauncher and
    TestTaskTrackerLocalization. (Ravi Gummadi via amareshwari)

    MAPREDUCE-2046. Fixes CombineFileInputFormat to allow splits with size
    less than DFS block size. (dhruba borthakur via amareshwari)

    MAPREDUCE-1975. Fixes unnecessary InterruptedException log in gridmix.
    (Ravi Gummadi via amareshwari)

    MAPREDUCE-1597. Fixes CombineFileInputFormat to work with non-splittable
    files. (amareshwari)

    MAPREDUCE-2032. Fixes TestJobCleanup to cleanup test directory in
    tearDown. (Dick King via amareshwari)

    MAPREDUCE-1979. Fixes "Output directory already exists" error in gridmix
    when gridmix.output.directory is not defined. (Ravi Gummadi via
    amareshwari)

    MAPREDUCE-1918. Adds documentation to Rumen. (Amar Kamat via amareshwari)

    MAPREDUCE-2078. Fixes TraceBuilder to generate traces when a globbed job
    history path is given. (Amar Kamat via amareshwari)

    MAPREDUCE-1989. Fixes error message in gridmix when user resolver is set
    and no user list is given. (Ravi Gummadi via amareshwari)

    MAPREDUCE-2067.  Distinct minicluster services (e.g. NN and JT) overwrite
    each other's service policies.  (Aaron T. Myers via tomwhite)

    MAPREDUCE-2029. DistributedRaidFileSystem removes itself from FileSystem
    cache when it is closed. (Ramkumar Vadali via dhruba)

    MAPREDUCE-1816. HAR files used for RAID parity-bite have configurable 
    partfile size. (Ramkumar Vadali via dhruba)

    MAPREDUCE-2082. Fixes Pipes to create the jobtoken file in the right
    place. (Jitendra Pandey via ddas)

    MAPREDUCE-2095. Fixes Gridmix to run from compressed traces. (Ranjit
    Mathew via amareshwari)

    MAPREDUCE-1908. DistributedRaidFileSystem now handles ChecksumException
    correctly. (Ramkumar Vadali via schen)

    MAPREDUCE-2126. JobQueueJobInProgressListener's javadoc is inconsistent
    with source code. (Jingguo Yao via tomwhite)

    MAPREDUCE-2143.  HarFileSystem is able to handle spaces in pathnames.
    (Ramkumar Vadali via dhruba)

    MAPREDUCE-1867.  Remove unused methods in
    org.apache.hadoop.streaming.StreamUtil.  (amareshwari via tomwhite)

    MAPREDUCE-2146.  Raid does not affect access time of a source file.
    (Ramkumar Vadali via dhruba)

    MAPREDUCE-2150.  RaidNode periodically fixes corrupt blocks. (Ramkumar Vadali via
    schen)

    MAPREDUCE-2099.  RaidNode recreates outdated parity HARs. (Ramkumar Vadali
    via schen)

    MAPREDUCE-2173.  Fix race condition in TestBlockFixer that was
    causing  intermittent failure (Patrick Kling via dhruba)

    MAPREDUCE-2142.  Refactor RaidNode so that the map-reduce component is
    clearly separated out. (Patrick Kling via dhruba)

    MAPREDUCE-2179. Fix RaidBlockSender compilation failure. (Ramkumar Vadali
    via schen)

    MAPREDUCE-2034. TestSubmitJob triggers NPE instead of permissions error.
    (Todd Lipcon via tomwhite)

    MAPREDUCE-2195. New property for local conf directory in
    system-test-mapreduce.xml file. (cos)

    MAPREDUCE-1783. FairScheduler initializes tasks only when the job can be
    run. (Ramkumar Vadali via schen)

    MAPREDUCE-2224. Fix synchronization bugs in JvmManager. (todd)

    MAPREDUCE-714. JobConf.findContainingJar unescapes unnecessarily on linux (todd)

    MAPREDUCE-2096. Secure local filesystem IO from symlink vulnerabilities (todd)

    MAPREDUCE-2234. If Localizer can't create task log directory, it should fail
    on the spot. (todd)

    MAPREDUCE-2219. JobTracker should not try to remove mapred.system.dir
    during startup. (todd)

    MAPREDUCE-2207. Task-cleanup task should not be scheduled on the node that
    the task just failed. (Liyin Liang via schen)

    MAPREDUCE-2084. Remove deprecate annotation for package file.  The package
    classes themselves are already deprecated. This removes an Eclipse error.
    (tomwhite via nigel)

    MAPREDUCE-2248. DistributedRaidFileSystem should unraid only the corrupt
    block (Ramkumar Vadali via schen)

    MAPREDUCE-1085. For tasks, "ulimit -v -1" is being run when user doesn't
    specify a ulimit (todd)

    MAPREDUCE-2282. Fix TestMRServerPorts for the changes in
    TestHDFSServerPorts.  (shv via szetszwo)

    MAPREDUCE-2238. Fix permissions handling to avoid leaving undeletable
    directories in local dirs. (todd)

    MAPREDUCE-2277. TestCapacitySchedulerWithJobTracker needs to wait for jobs
    to complete before testing status. (todd)

    MAPREDUCE-2253. Servlets should specify content type (todd)

    MAPREDUCE-2283. Add timeout for Raid Tests (Ramkumar Vadali via schen)

    MAPREDUCE-1754. Replace mapred.persmissions.supergroup with an 
    acl : mapreduce.cluster.administrators (Amareshwari Sriramadasu via shv)

    MAPREDUCE-2256. FairScheduler fairshare preemption from multiple pools may
    preempt all tasks from one pool causing that pool to go below fairshare.
    (Priyo Mustafi via shv)

    MAPREDUCE-2281. MR part of HADOOP-6642. (Chris Douglas, Po Cheung via shv)

    MAPREDUCE-2200. TestUmbilicalProtocolWithJobToken is failing without Krb
    evironment: needs to be conditional. (cos)

    MAPREDUCE-2077. Resolve name clash in the deprecated 
    o.a.h.util.MemoryCalculatorPlugin (Luke Lu via shv)

    MAPREDUCE-2188. The new API MultithreadedMapper doesn't initialize
    RecordReader. (Owen O'Malley via shv)

    MAPREDUCE-1915. Fix IndexOutOfBoundsException in IndexCache.
    (Priyo Mustafi via shv)

    MAPREDUCE-1974. Fix multiple preemtions of the same task in FairScheduler.
    (Scott Chen via shv)

    MAPREDUCE-2304. Fix TestMRCLI to allow hostname with a hyphen (-).
    (Priyo Mustafi via shv)

    MAPREDUCE-1825. jobqueue_details.jsp and FairSchedulerServelet should not
    call finishedMaps and finishedReduces when job is not initialized.
    (Scott Chen via shv)

    MAPREDUCE-2285. MiniMRCluster does not start after ant test-patch
    (todd)

    MAPREDUCE-2315. javadoc is failing in nightly build (todd)

    MAPREDUCE-2054. Hierarchical queue implementation broke dynamic queue
    addition in Dynamic Scheduler. (Thomas Sandholm via tomwhite)

    MAPREDUCE-2272. Job ACL file should not be executable
    (Harsh J Chouraria via todd)

    MAPREDUCE-2241. ClusterWithLinuxTaskController should accept relative path
    on the command line. (todd)

    MAPREDUCE-2251. Remove unused mapreduce.job.userhistorylocation config.
    (Harsh J Chouraria via todd)

    MAPREDUCE-2284. TestLocalRunner.testMultiMaps times out (todd)

    MAPREDUCE-2336. Tool-related packages should be in the Tool javadoc group.
    (tomwhite)
    
    MAPREDUCE-2394. JUnit output format doesn't propagate into raid contrib
    build. (todd)

    MAPREDUCE-2392. TaskTracker shutdown in the tests sometimes take 60s.
    (tomwhite)

    MAPREDUCE-2437. SLive uses only part* files to generating the final report.
    (shv)

    MAPREDUCE-2428. start-mapred.sh script fails if HADOOP_HOME is not set.
    (tomwhite via eli)

    MAPREDUCE-2445. Fix TestMiniMRWithDFSWithDistinctUsers to be a valid test.
    (todd)

    MAPREDUCE-2457. Job submission should inject group.name on the JobTracker
    (Alejandro Abdelnur via todd)

    MAPREDUCE-2472. Extra whitespace in mapred.child.java.opts breaks JVM
    initialization. (Aaron T. Myers via todd)

    MAPREDUCE-2222. Ivy resolve force mode should be turned off by default.
    (Luke Lu via tomwhite)

    MAPREDUCE-2486. Incorrect snapshot dependency published in .pom files
    (todd)

    MAPREDUCE-2327. MapTask doesn't need to put username information in
    SpillRecord. (todd via tomwhite)

    MAPREDUCE-2515. MapReduce code references some deprecated options
    (Ari Rabkin via todd)

    MAPREDUCE-2487. ChainReducer uses MAPPER_BY_VALUE instead of
    REDUCER_BY_VALUE. (Devaraj K via todd)

    MAPREDUCE-2185. Fix infinite loop at creating splits using
    CombineFileInputFormat. (Ramkumar Vadali via schen)

    MAPREDUCE-2571. CombineFileInputFormat.getSplits throws a
    java.lang.ArrayStoreException. (Bochun Bai via todd)

    MAPREDUCE-2767. Remove Linux task-controller. (Milind Bhandarkar via shv) 

    MAPREDUCE-2991. queueinfo.jsp fails to show queue status for Capacity 
    scheduler if queue names contain special symbols. (Priyo Mustafi via shv)

    MAPREDUCE-2531. Fixed jobcontrol to downgrade JobID. (Robert Evans via
    acmurthy) 

    MAPREDUCE-3139. SlivePartitioner generates negative partitions. (jghoman)

Release 0.21.1 - Unreleased

  NEW FEATURES

    MAPREDUCE-2040. Forrest Documentation for Dynamic Priority Scheduler.
    (Thomas Sandholm via tomwhite)

  BUG FIXES

    MAPREDUCE-1897. trunk build broken on compile-mapred-test (cos)

    MAPREDUCE-1280. Update Eclipse plugin to the new eclipse.jdt API.
    (Alex Kozlov via szetszwo)

    MAPREDUCE-1984. herriot TestCluster fails because exclusion is not there
    (Balaji Rajagopalan via cos)

    MAPREDUCE-2090. Clover build doesn't generate per-test coverage. (cos)

    MAPREDUCE-2134. ant binary-system is broken in mapreduce project. (cos)

    MAPREDUCE-1905. Fixes Context.setStatus() and progress() apis.
    (amareshwari)

    MAPREDUCE-1809. Ant build changes for Streaming system tests in contrib
    projects. (Vinay Kumar Thota via amareshwari)

    MAPREDUCE-2223. TestMRCLI might fail on Ubuntu with default /etc/hosts
    (cos)

    MAPREDUCE-2228. Remove java5 dependencies from build. (cos)

    MAPREDUCE-1929. Allow artifacts to be published to the staging Apache Nexus
    Maven Repository. (tomwhite)

    MAPREDUCE-2317. Fix a NPE in HadoopArchives.  (Devaraj K via szetszwo)

    MAPREDUCE-2127. mapreduce trunk builds are filing on hudson. 
    (Bruno Mahé via eli)

    MAPREDUCE-2779. JobSplitWriter.java can't handle large job.split file.
    (Ming Ma via shv)

Release 0.21.0 - 2010-08-13

  INCOMPATIBLE CHANGES

    MAPREDUCE-516. Fix the starvation problem in the Capacity Scheduler 
    when running High RAM Jobs. (Arun Murthy via yhemanth)

    MAPREDUCE-358. Change org.apache.hadoop.examples. AggregateWordCount 
    and org.apache.hadoop.examples.AggregateWordHistogram to use new 
    mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-245. Change Job and jobcontrol classes to use the List interface
    rather than ArrayList in APIs. (Tom White via cdouglas)

    MAPREDUCE-766. Enhanced list-blacklisted-trackers to display reasons
    for blacklisting a node. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-817. Add a cache for retired jobs with minimal job info and 
    provide a way to access history file url. (sharad)

    MAPREDUCE-711. Moved Distributed Cache from Common to Map/Reduce
    project. (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-895. Per the contract elucidated in HADOOP-6201, throw
    FileNotFoundException from FileSystem::listStatus rather than returning
    null. (Jakob Homan via cdouglas)

    MAPREDUCE-479. Provide full task id to map output servlet rather than the
    reduce id, only. (Jiaqi Tan via cdouglas)

    MAPREDUCE-873. Simplify job recovery. Incomplete jobs are resubmitted on 
    jobtracker restart. Removes a public constructor in JobInProgress. (sharad)

    HADOOP-6230. Moved process tree and memory calculator related classes from
    Common to Map/Reduce. (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-157. Refactor job history APIs and change the history format to 
    JSON. (Jothi Padmanabhan via sharad)

    MAPREDUCE-849. Rename configuration properties. (Amareshwari Sriramadasu 
    via sharad)

    MAPREDUCE-1287. Only call the partitioner with more than one reducer.
    (cdouglas)

    MAPREDUCE-1385. Use the new UserGroupInformation from HADOOP-6299.
    (ddas via omalley)

    MAPREDUCE-1493. Authorization for job-history pages. (vinodkv)

    MAPREDUCE-1607. Task controller may not set permissions for a
    task cleanup attempt's log directory (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-1683. Remove JNI calls from ClusterStatus cstr. (Arun Murthy and
    Luke Lu via cdouglas)

    MAPREDUCE-1855. Makes the refresh methods (for groups and proxy users) 
    independent of the client side configuration. (Boris Shkolnik via ddas)

  NEW FEATURES

    MAPREDUCE-1774. Large-scale Automated Framework (Sharad Agarwal, Sreekanth
    Ramakrishnan, Konstantin Boudnik, at all via cos)

    MAPREDUCE-706. Support for FIFO pools in the fair scheduler.
    (Matei Zaharia)

    MAPREDUCE-546. Provide sample fair scheduler config file in conf/ and use
    it by default if no other config file is specified. (Matei Zaharia)

    MAPREDUCE-551. Preemption support in the Fair Scheduler. (Matei Zaharia)

    MAPREDUCE-567. Add a new example MR that always fails. (Philip Zeyliger
    via tomwhite)

    MAPREDUCE-211. Provides ability to run a health check script on the
    tasktracker nodes and blacklist nodes if they are unhealthy.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-637. Add an example, distbbp, which able to compute the n th bit
    of Pi for some large n.  (szetszwo)

    MAPREDUCE-532. Provide a way to limit the number of used slots 
    per queue in the capacity scheduler.
    (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-467. Provide ability to collect statistics about total tasks 
    and succeeded tasks in different time windows. (sharad)

    MAPREDUCE-740. Log a job-summary at the end of a job, while allowing it
    to be configured to use a custom appender if desired. (acmurthy)

    MAPREDUCE-814. Provide a way to configure completed job history files 
    to be on HDFS. (sharad)

    MAPREDUCE-800. MRUnit should support the new API. (Aaron Kimball via
    tomwhite)

    MAPREDUCE-798. MRUnit should be able to test a succession of MapReduce
    passes. (Aaron Kimball via tomwhite)

    MAPREDUCE-768. Provide an option to dump jobtracker configuration in JSON
    format to standard output. (V.V.Chaitanya Krishna via yhemanth)

    MAPREDUCE-824. Add support for a hierarchy of queues in the capacity 
    scheduler. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-751. Add Rumen, a tool for extracting statistics from job tracker
    logs and generating job traces for simulation and analysis. (Dick King via
    cdouglas)

    MAPREDUCE-830. Add support for splittable compression to TextInputFormats.
    (Abdul Qadeer via cdouglas)

    MAPREDUCE-861. Add support for hierarchical queues in the Map/Reduce
    framework. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-776. Add Gridmix, a benchmark processing Rumen traces to simulate
    a measured mix of jobs on a cluster. (cdouglas)

    MAPREDUCE-862. Enhance JobTracker UI to display hierarchical queues.
    (V.V.Chaitanya Krishna via yhemanth)

    MAPREDUCE-777. Brand new apis to track and query jobs as a
    replacement for JobClient. (Amareshwari Sriramadasu via acmurthy)

    MAPREDUCE-775. Add native and streaming support for Vertica as an input
    or output format taking advantage of parallel read and write properties of 
    the DBMS. (Omer Trajman via ddas)

    MAPREDUCE-679. XML-based metrics as JSP servlet for JobTracker.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-980. Modify JobHistory to use Avro for serialization. (cutting)

    MAPREDUCE-728. Add Mumak, a Hadoop map/reduce simulator. (Arun C Murthy,
    Tamas Sarlos, Anirban Dasgupta, Guanying Wang, and Hong Tang via cdouglas)

    MAPREDUCE-1383. Automates fetching of delegation tokens in File*Formats
    Distributed Cache and Distcp. Also, provides a config 
    mapreduce.job.hdfs-servers that the jobs can populate with a comma
    separated list of namenodes. The job client automatically fetches
    delegation tokens from those namenodes. (Boris Shkolnik via ddas)    

    MAPREDUCE-698. Per-pool task limits for the fair scheduler.
    (Kevin Peterson via matei)

    MAPREDUCE-1026. Does mutual authentication of the shuffle
    transfers using a shared JobTracker generated key.
    (Boris Shkolnik via ddas)

    MAPREDUCE-744. Introduces the notion of a public distributed cache.
    (Devaraj Das)

    MAPREDUCE-1338. Introduces the notion of token cache using which
    tokens and secrets can be sent by the Job client to the JobTracker.
    (Boris Shkolnik via ddas)

    HDFS-503. This patch implements an optional layer over HDFS that 
    implements offline erasure-coding.  It can be used to reduce the 
    total storage requirements of HDFS.  (dhruba)

    MAPREDUCE-1432. Adds hooks in the jobtracker and tasktracker 
    for loading the tokens in the user's ugi. This is required
    for the copying of files from the hdfs. (ddas)

    MAPREDUCE-1335. Adds SASL Kerberos/Digest authentication in MapReduce.
    (Kan Zhang via ddas)

    MAPREDUCE-1464. Makes a compatible change in JobTokenIdentifier to
    account for HADOOP-6510. (Jitendra Nath Pandey via ddas)

    MAPREDUCE-1433. Add a delegation token for MapReduce. (omalley)

    MAPREDUCE-1307. Introduces the Job level ACLs feature. 
    (Vinod Kumar Vavilapalli via ddas)

    MAPREDUCE-1430. JobTracker automatically renews delegation tokens for jobs.
    (Boris Shkolnik via ddas)

    MAPREDUCE-1455. Introduces job-level authorization for mapreduce servlets.
    (Ravi Gummadi via vinodkv)

  IMPROVEMENTS

    MAPREDUCE-463. Makes job setup and cleanup tasks as optional.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-502. Allow jobtracker to be configured with zero completed jobs
    in memory. (Amar Kamat via sharad)

    MAPREDUCE-416. Moves the history file to a "done" folder whenever a job 
    completes. (Amar Kamat via ddas)

    MAPREDUCE-646. Increase srcfilelist replication number in dictcp job.
    (Ravi Gummadi via szetszwo)
   
    HADOOP-6106. Updated hadoop-core and test jars from hudson trunk 
    build #12. (Giridharan Kesavan)

    MAPREDUCE-642. A option to distcp that allows preserving the full
    source path of a file in the specified destination directory.
    (Rodrigo Schmidt via dhruba)

    MAPREDUCE-686. Move TestSpeculativeExecution.Fake* into a separate class
    so that it can be used by other tests. (Jothi Padmanabhan via sharad)

    MAPREDUCE-625. Modify TestTaskLimits to improve execution time.
    (Jothi Padmanabhan via sharad)

    MAPREDUCE-465. Deprecate o.a.h.mapred.lib.MultithreadedMapRunner and add
    test for o.a.h.mapreduce.lib.MultithreadedMapper.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-701. Improves the runtime of the TestRackAwareTaskPlacement
    by making it a unit test.  (Jothi Padmanabhan via ddas)

    MAPREDUCE-371. Change KeyFieldBasedComparator and KeyFieldBasedPartitioner
    to use new api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-623. Resolve javac warnings in mapreduce. (Jothi Padmanabhan
    via sharad)

    MAPREDUCE-655. Change KeyValueLineRecordReader and KeyValueTextInputFormat
    to use new mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-632. Merge TestCustomOutputCommitter with 
    TestCommandLineJobSubmission. (Jothi Padmanabhan via sharad)

    MAPREDUCE-627. Improves execution time of TestTrackerBlacklistAcrossJobs.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-630. Improves execution time of TestKillCompletedJob.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-626. Improves the execution time of TestLostTracker.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-353. Makes the shuffle read and connection timeouts
    configurable. (Ravi Gummadi via ddas)

    MAPREDUCE-739. Allow relative paths to be created in archives. (Mahadev
    Konar via cdouglas)

    MAPREDUCE-772. Merge HADOOP-4010 changes to LineRecordReader into mapreduce
    package. (Abdul Qadeer via cdouglas)

    MAPREDUCE-785. Separate sub-test of TestReduceFetch to be included in
    MR-670. (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-784. Modify TestUserDefinedCounters to use LocalJobRunner 
    instead of MiniMR. (Jothi Padmanabhan via sharad)

    HADOOP-6160. Fix releaseaudit target to run on specific directories. 
    (gkesavan)

    MAPREDUCE-782. Use PureJavaCrc32 in SpillRecord.  (Todd Lipcon via
    szetszwo)

    MAPREDUCE-369. Change org.apache.hadoop.mapred.lib.MultipleInputs to 
    use new api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-373. Change org.apache.hadoop.mapred.lib.FieldSelectionMapReduce
    to use new api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-628. Improves the execution time of TestJobInProgress.
    (Jothi Padmanabhan via ddas)

    MAPREDUCE-793. Creates a new test that consolidates a few tests to
    include in the commit-test list. (Jothi Padmanabhan via ddas)
    
    MAPREDUCE-797. Adds combiner support to MRUnit MapReduceDriver.
    (Aaron Kimball via johan)    

    MAPREDUCE-656. Change org.apache.hadoop.mapred.SequenceFile* classes
    to use new mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-670. Creates ant target for 10 mins patch test build.
    (Jothi Padmanabhan via gkesavan)

    MAPREDUCE-375. Change org.apache.hadoop.mapred.lib.NLineInputFormat 
    and org.apache.hadoop.mapred.MapFileOutputFormat to use new api.
    (Amareshwari Sriramadasu via ddas)

    MAPREDUCE-779. Added node health failure counts into 
    JobTrackerStatistics. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-842. Setup secure permissions for localized job files,
    intermediate outputs and log files on tasktrackers.
    (Vinod Kumar Vavilapalli via yhemanth)
    
    MAPREDUCE-478. Allow map and reduce jvm parameters, environment variables
    and ulimit to be set separately.
    Configuration changes:
      add mapred.map.child.java.opts
      add mapred.reduce.child.java.opts
      add mapred.map.child.env
      add mapred.reduce.child.ulimit
      add mapred.map.child.env
      add mapred.reduce.child.ulimit
      deprecated mapred.child.java.opts
      deprecated mapred.child.env
      deprecated mapred.child.ulimit
    (acmurthy)

    MAPREDUCE-767. Remove the dependence on the CLI 2.0 snapshot.
    (Amar Kamat via omalley)

    MAPREDUCE-712. Minor efficiency tweaks to RandomTextWriter. (cdouglas)

    MAPREDUCE-870. Remove the job retire thread and the associated 
    config parameters. (sharad)

    MAPREDUCE-874. Rename the PiEstimator example to QuasiMonteCarlo.
    (szetszwo)

    MAPREDUCE-336. Allow logging level of map/reduce tasks to be configurable. 
    Configuration changes:
      add mapred.map.child.log.level 
      add mapred.reduce.child.log.level 
    (acmurthy)

    MAPREDUCE-355. Update mapred.join package to use the new API. (Amareshwari
    Sriramadasu via cdouglas)

    HADOOP-6184. Updated hadoop common and test jars to get the new API
    in Configuration for dumping in JSON format from Hudson trunk build #68.
    (yhemanth)

    MAPREDUCE-476. Extend DistributedCache to work locally (LocalJobRunner).
    (Philip Zeyliger via tomwhite)

    MAPREDUCE-825. JobClient completion poll interval of 5s causes slow tests
    in local mode. (Aaron Kimball via tomwhite)

    MAPREDUCE-910. Support counters in MRUnit. (Aaron Kimball via cdouglas)

    MAPREDUCE-788. Update gridmix2 to use the new API (Amareshwari Sriramadasu
    via cdouglas)

    MAPREDUCE-875. Make DBRecordReader execute queries lazily. (Aaron Kimball 
    via enis)

    MAPREDUCE-318. Modularizes the shuffle code. (Jothi Padmanabhan and 
    Arun Murthy via ddas)

    MAPREDUCE-936. Allow a load difference for fairshare scheduler.
    (Zheng Shao via dhruba)

    MAPREDUCE-370. Update MultipleOutputs to use the API, merge funcitonality
    of MultipleOutputFormat. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-898. Changes DistributedCache to use the new API.
    (Amareshwari Sriramadasu via ddas)

    MAPREDUCE-144. Includes dump of the process tree in task diagnostics when 
    a task is killed due to exceeding memory limits.
    (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-945. Modifies MRBench and TestMapRed to use ToolRunner so that
    options such as queue name can be passed via command line.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-963. Deprecate o.a.h.mapred.FileAlreadyExistsException and
    replace it with o.a.h.fs.FileAlreadyExistsException.  (Boris Shkolnik
    via szetszwo)

    MAPREDUCE-960. Remove an unnecessary intermediate copy and obsolete API
    from KeyValueLineRecordReader. (cdouglas)

    MAPREDUCE-930. Modify Rumen to resolve paths in the canonical way, rather
    than defaulting to the local filesystem. (cdouglas)

    MAPREDUCE-944. Extend the LoadManager API of the fair-share scheduler
    to support regulating tasks for a job based on resources currently in use
    by that job. (dhruba)

    MAPREDUCE-973. Move FailJob and SleepJob from examples to test. (cdouglas 
    via omalley)

    MAPREDUCE-966. Modify Rumen to clean up interfaces and simplify integration
    with other tools. (Hong Tang via cdouglas)

    MAPREDUCE-856. Setup secure permissions for distributed cache files.
    (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-885. More efficient SQL queries for DBInputFormat. (Aaron Kimball 
    via enis)

    MAPREDUCE-284. Enables ipc.client.tcpnodelay in Tasktracker's Child.
    (Ravi Gummadi via sharad)

    MAPREDUCE-916. Split the documentation to match the project split.
    (Corinne Chandel via omalley)

    MAPREDUCE-649. Validate a copy by comparing the source and destination
    checksums in distcp. Also adds an intra-task retry mechanism for errors
    detected during the copy. (Ravi Gummadi via cdouglas)

    MAPREDUCE-654. Add a -dryrun option to distcp printing a summary of the
    file data to be copied, without actually performing the copy. (Ravi Gummadi
    via cdouglas)

    MAPREDUCE-664. Display the number of files deleted by distcp when the
    -delete option is specified. (Ravi Gummadi via cdouglas)

    MAPREDUCE-781. Let the name of distcp jobs be configurable. (Venkatesh S
    via cdouglas)

    MAPREDUCE-975. Add an API in job client to get the history file url for 
    a given job id. (sharad)

    MAPREDUCE-905. Add Eclipse launch tasks for MapReduce. (Philip Zeyliger
    via tomwhite)

    MAPREDUCE-277. Makes job history counters available on the job history
    viewers. (Jothi Padmanabhan via ddas)

    MAPREDUCE-893. Provides an ability to refresh queue configuration
    without restarting the JobTracker.
    (Vinod Kumar Vavilapalli and Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1011. Add build.properties to svn and git ignore. (omalley)

    MAPREDUCE-954. Change Map-Reduce context objects to be interfaces.
    (acmurthy) 

    MAPREDUCE-639. Change Terasort example to reflect the 2009 updates. 
    (omalley)

    MAPREDUCE-1063. Document gridmix benchmark. (cdouglas)

    MAPREDUCE-931. Use built-in interpolation classes for making up task
    runtimes in Rumen. (Dick King via cdouglas)

    MAPREDUCE-1012. Mark Context interfaces as public evolving. (Tom White via
    cdouglas)

    MAPREDUCE-971. Document use of distcp when copying to s3, managing timeouts
    in particular. (Aaron Kimball via cdouglas)

    HDFS-663. DFSIO for append. (shv)

    HDFS-641. Move all of the components that depend on map/reduce to 
    map/reduce. (omalley)

    HADOOP-5107. Use Maven ant tasks to publish artifacts. (Giridharan Kesavan
    via omalley)

    MAPREDUCE-1229. Allow customization of job submission policy in Mumak.
    (Hong Tang via cdouglas)

    MAPREDUCE-1317. Reduce the memory footprint of Rumen objects by interning
    host Strings. (Hong Tang via cdouglas)

    MAPREDUCE-1097. Add support for Vertica 3.5 to its contrib module. (Omer
    Trajman via cdouglas)

    MAPREDUCE-1627. HadoopArchives should not uses a method in DistCp.
    (szetszwo)

    MAPREDUCE-1198. Alternatively schedule different types of tasks in
    fair share scheduler. (Scott Chen via matei)

    MAPREDUCE-707. Provide a jobconf property for explicitly assigning a job to 
    a pool in the Fair Scheduler. (Alan Heirich via matei)

    MAPREDUCE-947. Added commitJob and abortJob apis to OutputCommitter.
    Enhanced FileOutputCommitter to create a _SUCCESS file for successful
    jobs. (Amar Kamat & Jothi Padmanabhan via acmurthy) 

    MAPREDUCE-1103. Added more metrics to Jobtracker. (sharad) 

    MAPREDUCE-1048. Add occupied/reserved slot usage summary on jobtracker UI.
    (Amareshwari Sriramadasu and Hemanth Yamijala via sharad)

    MAPREDUCE-1090. Modified log statement in TaskMemoryManagerThread to
    include task attempt id. (yhemanth)

    MAPREDUCE-1189. Reduce ivy console output to ovservable level (cos)

    MAPREDUCE-1167. ProcfsBasedProcessTree collects rss memory information.
    (Scott Chen via dhruba)

    MAPREDUCE-1231. Added a new DistCp option, -skipcrccheck, so that the CRC
    check during setup can be skipped.  (Jothi Padmanabhan via szetszwo)

    MAPREDUCE-1190. Add package documentation for BBP example.
    (Tsz Wo (Nicholas) Sze via cdouglas)

    MAPREDUCE-1119. When tasks fail to report status, show tasks's stack dump
    before killing. (Aaron Kimball via tomwhite)

    MAPREDUCE-1185. Redirect running job url to history url if job is already 
    retired. (Amareshwari Sriramadasu and Sharad Agarwal via sharad)

    MAPREDUCE-1050. Introduce a mock object testing framework. (tomwhite)

    MAPREDUCE-1084. Implementing aspects development and fault injeciton
    framework for MapReduce. (Sreekanth Ramakrishnan via cos)

    MAPREDUCE-1209. Move common specific part of the test TestReflectionUtils
    out of mapred into common. (Todd Lipcon via tomwhite)

    MAPREDUCE-967. TaskTracker does not need to fully unjar job jars.
    (Todd Lipcon via tomwhite)

    MAPREDUCE-1083. Changes in MapReduce so that group information of users 
    can be refreshed in the JobTracker via command line. 
    (Boris Shkolnik via ddas)

    MAPREDUCE-181. Changes the job submission process to be secure.
    (Devaraj Das)

    MAPREDUCE-1250. Refactors the JobToken to use Common's Token interface.
    (Kan Zhang via ddas)

    MAPREDUCE-896. Enhance tasktracker to cleanup files that might have
    been created by user tasks with non-writable permissions.
    (Ravi Gummadi via yhemanth)

    MAPREDUCE-372. Change org.apache.hadoop.mapred.lib.ChainMapper/Reducer 
    to use new mapreduce api. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-1295. Add a tool in Rumen for folding and manipulating job
    traces. (Dick King via cdouglas)

    MAPREDUCE-1302. TrackerDistributedCacheManager deletes file
    asynchronously, thus reducing task initialization delays.
    (Zheng Shao via dhruba)

    MAPREDUCE-1218. TaskTrackers send cpu and memory usage of
    node to JobTracker. (Scott Chen via dhruba)

    MAPREDUCE-847. Fix Releaseaudit warning count to zero
    (Giridharan Kesavan)

    MAPREDUCE-1337. Use generics in StreamJob to improve readability of that
    class. (Kay Kay via cdouglas)

    MAPREDUCE-361. Port terasort example to the new mapreduce API. (Amareshwari
    Sriramadasu via cdouglas)

    MAPREDUCE-1367. LocalJobRunner should support parallel mapper execution.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-64. Eliminate io.sort.record.percent from MapTask configuration.
    (cdouglas)

    MAPREDUCE-1440. Replace the long user name in MapReduce with the local
    name. (omalley)

    MAPREDUCE-1470. Move delegation tokens from HDFS to Common so that 
    MapReduce can use them too. (omalley)

    MAPREDUCE-1425. Reduce memory usage by archive. (mahadev via szetszwo)

    MAPREDUCE-1441. Trim whitespace from directory lists pulled from the
    configuration. (Todd Lipcon via cdouglas)

    MAPREDUCE-1309. Refactor Rumen trace generator to improve code structure
    and add extensible support for log formats. (Dick King via cdouglas)

    MAPREDUCE-1503. Delegation token renewing and cancelling should provide
    meaningful exceptions when there are failures instead of returning 
    false. (omalley)

    HADOOP-6579. Upgrade commons-codec library to 1.4. (omalley)

    MAPREDUCE-1423. Improve performance of CombineFileInputFormat when multiple
    pools are configured. (Dhruba Borthakur via zshao)

    MAPREDUCE-1454. Quote user supplied strings in Tracker servlets. (cdouglas)

    MAPREDUCE-1408. Add customizable job submission policies to Gridmix. (Rahul
    Singh via cdouglas)

    MAPREDUCE-1527. Better warning logged when mapred.queue.names is
    overshadowed by mapred-queues.xml. (Hong Tang via acmurthy)

    MAPREDUCE-1403. Save the size and number of distributed cache artifacts in
    the configuration. (Arun Murthy via cdouglas)

    MAPREDUCE-1482. Truncate state string and diagnostic information in
    TaskStatus. (Amar Kamat via szetszwo)

    MAPREDUCE-1593.  [Rumen] Improvements to random seed generation (tamas via
    mahadev)

    MAPREDUCE-1460. Oracle support in DataDrivenDBInputFormat.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-1569. Pass configuration through mocked contexts in MRUnit.
    (Chris White via cdouglas)

    MAPREDUCE-1590. Move HarFileSystem from Hadoop Common to Mapreduce tools.
    (mahadev)

    MAPREDUCE-1629. Get rid of fakeBlockLocations() on HarFileSystem, since
    it's not used (mahadev)

    MAPREDUCE-1489. DataDrivenDBInputFormat should not query the database
    when generating only one split. (Aaron Kimball via tomwhite)

    MAPREDUCE-1514.  Add documentation on replication, permissions, new options,
    limitations and internals of har.  (mahadev via szetszwo)

    MAPREDUCE-1428.  Make block size and the size of archive created files
    configurable.  (mahadev via szetszwo)

    MAPREDUCE-1656. JobStory should provide queue info. (hong via mahadev)

    MAPREDUCE-1466. Record number of files processed in FileInputFormat in the
    Configuration for offline analysis. (Luke Lu and Arun Murthy via cdouglas)

    MAPREDUCE-1538. TrackerDistributedCacheManager manages the
    number of files. (Scott Chen via dhruba)

    MAPREDUCE-1673. Scripts to start and stop RaidNode.
    (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1659. RaidNode writes temp files on configured tmp directory and
    add random numbers to their names to avoid conflicts
    (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1221. Allow admins to control physical memory limits per-task
    and per-node. (Scott Chen via acmurthy) 

    MAPREDUCE-1065. Update mapred tutorial to use the new API. (Aaron Kimball
    via cdouglas)

    MAPREDUCE-1304. Add a task counter tracking time spent in GC. (Aaron
    Kimball via cdouglas)

    MAPREDUCE-1570. Add grouping comparators to MRUnit. (Chris White via
    cdouglas)

    MAPREDUCE-1650. Exclude Private elements from generated MapReduce
    Javadoc. (tomwhite)

    MAPREDUCE-1625. Improve grouping of packages in Javadoc. (tomwhite)

    MAPREDUCE-1417. Forrest documentation should be updated to reflect 
    the changes in MAPREDUCE-744. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1568. TrackerDistributedCacheManager should clean up cache
    in a background thread. (Scott Chen via zshao)

    MAPREDUCE-1749. Move configuration strings out of JobContext so that it
    can be made public stable. (omalley)

    MAPREDUCE-1623. Apply audience and stability notations to Hadoop
    Map-Reduce. (tomwhite via acmurthy) 

    MAPREDUCE-1751. Change MapReduce to depend on Hadoop 'common' artifacts
    instead of 'core'. (tomwhite)

    MAPREDUCE-1535.  Replace usage of FileStatus#isDir().  (Eli Collins via
    tomwhite)

    MAPREDUCE-1832. Allow file sizes less than 1MB in DFSIO benchmark. (shv)

    MAPREDUCE-1404.  Move Cluster-Setup and Single-Node-Setup Docs from
    MapReduce to Common.  (tomwhite)

    MAPREDUCE-1697. Document the behavior of -file option and deprecate it
    in favour of -files option in streaming. (Amareshwari Sriramadasu
    via vinodkv)

    MAPREDUCE-1033. Resolve location of scripts and configuration files after
    project split. (tomwhite)

    MAPREDUCE-1018. Document changes to the memory management and scheduling
    model. (Hemanth Yamijala via vinodkv)

    MAPREDUCE-1896. [Herriot] New property for multi user list. (Vinay Thota
    via cos)

    MAPREDUCE-1812. New properties for suspend and resume process. (Vinay
    Thota via cos)

  OPTIMIZATIONS

    MAPREDUCE-270. Fix the tasktracker to optionally send an out-of-band
    heartbeat on task-completion for better job-latency. (acmurthy) 
    Configuration changes:
      add mapreduce.tasktracker.outofband.heartbeat 

    MAPREDUCE-1186. Modified code in distributed cache to set permissions
    only on required set of localized paths.
    (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1501. FileInputFormat supports multi-level, recursive 
    directory listing.  (Zheng Shao via dhruba)

    MAPREDUCE-1556. upgrade to Avro 1.3.0. (cutting via tomwhite)

    MAPREDUCE-1613. Install/deploy source jars to Maven repo 
    (Patrick Angeles via ddas)

    MAPREDUCE-1610. Forrest documentation should be updated to reflect
    the changes in MAPREDUCE-856. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1853. Adds caching for TaskAttemptContext in MultipleOutputs.
    (Torsten Curdt via amareshwari)

  BUG FIXES

    MAPREDUCE-878. Rename fair scheduler design doc to 
    fair-scheduler-design-doc.tex and add Apache license header (matei)

    HADOOP-4687. MapReduce is split from Hadoop Core. It is a subproject under 
    Hadoop (Owen O'Malley)

    HADOOP-6096. Fix Eclipse project and classpath files following project
    split. (tomwhite)

    MAPREDUCE-419. Reconcile mapred.userlog.limit.kb defaults in configuration
    and code. (Philip Zeyliger via cdouglas)

    MAPREDUCE-2. Fixes a bug in KeyFieldBasedPartitioner in handling empty
    keys. (Amar Kamat via sharad)

    MAPREDUCE-130. Delete the jobconf copy from the log directory of the 
    JobTracker when the job is retired. (Amar Kamat via sharad)

    MAPREDUCE-657. Fix hardcoded filesystem problem in CompletedJobStatusStore.
    (Amar Kamat via sharad)

    MAPREDUCE-179. Update progress in new RecordReaders. (cdouglas)

    MAPREDUCE-658. Replace NPE in distcp with a meaningful error message when
    the source path does not exist. (Ravi Gummadi via cdouglas)

    MAPREDUCE-671. Update ignore list to include untracked, generated
    build artifacts and config files. (cdouglas)

    MAPREDUCE-433. Use more reliable counters in TestReduceFetch. (cdouglas)

    MAPREDUCE-124. Fix a bug in failure handling of abort task of 
    OutputCommiter. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-694. Fix to add jsp-api jars to capacity-scheduler classpath.
    (Giridharan Kesavan)
    
    MAPREDUCE-702. Fix eclipse-plugin jar target (Giridharan Kesavan) 

    MAPREDUCE-522. Replace TestQueueCapacities with simpler test case to
    test integration between capacity scheduler and MR framework.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-683. Fixes an initialization problem in the JobHistory. 
    The initialization of JobHistoryFilesManager is now done in the 
    JobHistory.init call. (Amar Kamat via ddas)

    MAPREDUCE-708. Fixes a bug to allow updating the reason for
    blacklisting a node on the JobTracker UI.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-709. Fixes message displayed for a blacklisted node where
    the reason for blacklisting is due to the health check script
    timing out. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-676. Existing diagnostic rules fail for MAP ONLY jobs.
    (Suhas Gogate via tomwhite)

    MAPREDUCE-722. Fixes a bug with tasktracker reservations for
    high memory jobs in capacity scheduler.
    (Vinod Kumar Vavilapalli via yhemanth)

    HADOOP-6090. Updates gridmix script to use new mapreduce api output 
    format. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-732. Removed spurious log statements in the node
    blacklisting logic. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-734. Fix a ConcurrentModificationException in unreserving
    unused reservations for a job when it completes.
    (Arun Murthy and Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-733. Fix a RuntimeException while unreserving trackers
    that are blacklisted for a job.
    (Arun Murthy and Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-677. Fix timeout in TestNodeRefresh. (Amar Kamat via 
    sharad)

    MAPREDUCE-153. Fix timeout in TestJobInProgressListener. (Amar 
    Kamat via sharad)

    MAPREDUCE-742. Fix output messages and java comments in the Pi related
    examples.  (szetszwo)

    MAPREDUCE-565. Fix partitioner to work with new API. (Owen O'Malley via
    cdouglas)
    
    MAPREDUCE-680. Fix so MRUnit can handle reuse of Writable objects.
    (Aaron Kimball via johan)

    MAPREDUCE-18. Puts some checks for cross checking whether a reduce
    task gets the correct shuffle data. (Ravi Gummadi via ddas)

    MAPREDUCE-771. Fix scheduling of setup and cleanup tasks to use
    free slots instead of tasks for scheduling. (yhemanth)

    MAPREDUCE-717. Fixes some corner case issues in speculative 
    execution heuristics. (Devaraj Das)

    MAPREDUCE-716. Make DBInputFormat work with Oracle. (Aaron Kimball
    via tomwhite)

    MAPREDUCE-735. Fixes a problem in the KeyFieldHelper to do with 
    the end index for some inputs (Amar Kamat via ddas)

    MAPREDUCE-682. Removes reservations on tasktrackers which are
    blacklisted. (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-743. Fixes a problem to do with progress reporting
    in the map phase. (Ravi Gummadi via ddas)

    MAPREDUCE-765. Eliminate the deprecated warnings introduced by H-5438.
    (He Yongqiang via szetszwo)

    MAPREDUCE-383. Fix a bug in Pipes combiner due to bytes count not 
    getting reset after the spill. (Christian Kunz via sharad)

    MAPREDUCE-809. Fix job-summary logs to correctly record status of FAILED
    and KILLED jobs.  (acmurthy)

    MAPREDUCE-792. Fix unchecked warnings in DBInputFormat.  (Aaron Kimball
    via szetszwo)

    MAPREDUCE-760. Fix a timing issue in TestNodeRefresh. (Amar Kamat via 
    sharad)

    MAPREDUCE-40. Keep memory management backwards compatible for job
    configuration parameters and limits. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-587. Fixes a OOM issue in TestStreamingExitStatus.
    (Amar Kamat via ddas) 

    MAPREDUCE-408. Fixes an assertion problem in TestKillSubProcesses
    (Ravi Gummadi via ddas)
     
    MAPREDUCE-659. Fix gridmix2 compilation. (Giridharan Kesavan)

    MAPREDUCE-796. Fixes a ClassCastException in an exception log in
    MultiThreadedMapRunner. (Amar Kamat via ddas)

    MAPREDUCE-808. Fixes a serialization problem in TypedBytes.
    (Klaas Bosteels via ddas)

    MAPREDUCE-845. Fix a findbugs heap size problem in build.xml and add
    a new property findbugs.heap.size.  (Lee Tucker via szetszwo)

    MAPREDUCE-838. Fixes a problem in the way commit of task outputs
    happens. The bug was that even if commit failed, the task would
    be declared as successful. (Amareshwari Sriramadasu via ddas)

    MAPREDUCE-813. Updates Streaming and M/R tutorial documents.
    (Corinne Chandel via ddas)

    MAPREDUCE-805. Fixes some deadlocks in the JobTracker due to the fact
    the JobTracker lock hierarchy wasn't maintained in some JobInProgress
    method calls. (Amar Kamat via ddas)
    
    MAPREDUCE-799. Fixes so all of the MRUnit self-tests run.
    (Aaron Kimball via johan)    

    MAPREDUCE-848. Fixes a problem to do with TestCapacityScheduler
    failing (Amar Kamat via ddas)

    MAPREDUCE-840. DBInputFormat leaves open transaction.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-859. Adds Avro and its dependencies required by Hadoop 
    common. (Ravi Gummadi via sharad)
    
    MAPREDUCE-867. Fix ivy conf to look for avro jar from maven repo.	
    (Giridharan Kesavan)

    MAPREDUCE-877. Added avro as a dependency to contrib ivy settings.
    (Tsz Wo (Nicholas) Sze via yhemanth)

    MAPREDUCE-852. In build.xml, remove the Main-Class, which is incorrectly
    set in tools, and rename the target "tools-jar" to "tools".  (szetszwo)

    MAPREDUCE-773. Sends progress reports for compressed gzip inputs in maps.
    Fixes a native direct buffer leak in LineRecordReader classes.
    (Hong Tang and ddas)

    MAPREDUCE-832. Reduce number of warning messages printed when
    deprecated memory variables are used. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-745. Fixes a testcase problem to do with generation of JobTracker
    IDs. (Amar Kamat via ddas)

    MAPREDUCE-834. Enables memory management on tasktrackers when old
    memory management parameters are used in configuration.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-818. Fixes Counters#getGroup API. (Amareshwari Sriramadasu 
    via sharad)

    MAPREDUCE-807. Handles the AccessControlException during the deletion of
    mapred.system.dir in the JobTracker. The JobTracker will bail out if it
    encounters such an exception. (Amar Kamat via ddas)

    MAPREDUCE-430. Fix a bug related to task getting stuck in case of 
    OOM error. (Amar Kamat via ddas)

    MAPREDUCE-871. Fix ownership of Job/Task local files to have correct 
    group ownership according to the egid of the tasktracker.
    (Vinod Kumar Vavilapalli via yhemanth) 

    MAPREDUCE-911. Fix a bug in TestTaskFail related to speculative 
    execution. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-687. Fix an assertion in TestMiniMRMapRedDebugScript.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-924. Fixes the TestPipes testcase to use Tool.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-903. Add Avro jar to eclipse classpath.
    (Philip Zeyliger via tomwhite)

    MAPREDUCE-943. Removes a testcase in TestNodeRefresh that doesn't make 
    sense in the new Job recovery model. (Amar Kamat via ddas)

    MAPREDUCE-764. TypedBytesInput's readRaw() does not preserve custom type
    codes. (Klaas Bosteels via tomwhite)

    HADOOP-6243. Fixes a NullPointerException in handling deprecated keys.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-968. NPE in distcp encountered when placing _logs directory on
    S3FileSystem. (Aaron Kimball via tomwhite)
 
    MAPREDUCE-826. harchive doesn't use ToolRunner / harchive returns 0 even
    if the job fails with exception (koji Noguchi via mahadev)

    MAPREDUCE-839. unit test TestMiniMRChildTask fails on mac os-x (hong tang
    via mahadev)

    MAPREDUCE-112. Add counters for reduce input, output records to the new API.
    (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-648. Fix two distcp bugs: (1) it should not launch a job if all
    src paths are directories, and (2) it does not skip copying when updating
    a single file.  (Ravi Gummadi via szetszwo)

    MAPREDUCE-946. Fix a regression in LineRecordReader where the
    maxBytesToConsume parameter is not set correctly. (cdouglas)

    MAPREDUCE-977. Missing jackson jars from Eclipse template. (tomwhite)

    MAPREDUCE-988. Fix a packaging issue in the contrib modules. (Hong Tang via
    cdouglas)

    MAPREDUCE-971. distcp does not always remove distcp.tmp.dir. (Aaron Kimball
    via tomwhite)

    MAPREDUCE-995. Fix a bug in JobHistory where tasks completing after the job
    is closed cause a NPE. (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-953. Fix QueueManager to dump queue configuration in JSON format.
    (V.V. Chaitanya Krishna via yhemanth)

    MAPREDUCE-645. Prevent distcp from running a job when the destination is a
    file, but the source is not. (Ravi Gummadi via cdouglas)

    MAPREDUCE-1002. Flushed writer in JobQueueClient so queue information is
    printed correctly. (V.V. Chaitanya Krishna via yhemanth)

    MAPREDUCE-1003. Fix compilation problem in eclipse plugin when
    eclipse.home is set. (Ravi Gummadi via yhemanth)

    MAPREDUCE-941. Vaidya script fails on Solaris. (Chad Metcalf
    via tomwhite)

    MAPREDUCE-912. Add and standardize Apache license headers. (Chad Metcalf
    via cdouglas)

    MAPREDUCE-1022. Fix compilation of vertica testcases. (Vinod Kumar 
    Vavilapalli via acmurthy)

    MAPREDUCE-1000. Handle corrupt history files in JobHistory.initDone().
    (Jothi Padmanabhan via sharad)

    MAPREDUCE-1028. Fixed number of slots occupied by cleanup tasks to one
    irrespective of slot size for the job.
    (Ravi Gummadi via yhemanth)

    MAPREDUCE-964. Fixed start and finish times of TaskStatus to be
    consistent, thereby fixing inconsistencies in metering tasks.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-1076. Deprecate ClusterStatus and add javadoc in ClusterMetrics.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-979. Fixed JobConf APIs related to memory parameters to return
    values of new configuration variables when deprecated variables are
    disabled. (Sreekanth Ramakrishnan via yhemanth)
   
    MAPREDUCE-1030. Modified scheduling algorithm to return a map and reduce
    task per heartbeat in the capacity scheduler.
    (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1071. Use DataInputStream rather than FSDataInputStream in the
    JobHistory EventReader. (Hong Tang via cdouglas)

    MAPREDUCE-986. Fix Rumen to work with truncated task lines. (Dick King via
    cdouglas)

    MAPREDUCE-1029. Fix failing TestCopyFiles by restoring the unzipping of
    HDFS webapps from the hdfs jar. (Aaron Kimball and Jothi Padmanabhan via
    cdouglas)

    MAPREDUCE-769. Make findbugs and javac warnings to zero.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-1104. Initialize RecoveryManager in JobTracker cstr called by
    Mumak. (Hong Tang via cdouglas)

    MAPREDUCE-1061. Add unit test validating byte specifications for gridmix
    jobs. (cdouglas)

    MAPREDUCE-1077. Fix Rumen so that truncated tasks do not mark the job as
    successful. (Dick King via cdouglas)

    MAPREDUCE-1041. Make TaskInProgress::taskStatuses map package-private.
    (Jothi Padmanabhan via cdouglas)

    MAPREDUCE-1070. Prevent a deadlock in the fair scheduler servlet.
    (Todd Lipcon via cdouglas)

    MAPREDUCE-1086. Setup Hadoop logging environment for tasks to point to
    task related parameters. (Ravi Gummadi via yhemanth)

    MAPREDUCE-1105. Remove max limit configuration in capacity scheduler in
    favor of max capacity percentage thus allowing the limit to go over
    queue capacity. (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1016.  Make the job history log format JSON.  (cutting)

    MAPREDUCE-1038. Weave Mumak aspects only if related files have changed.
    (Aaron Kimball via cdouglas)

    MAPREDUCE-1163. Remove unused, hard-coded paths from libhdfs. (Allen
    Wittenauer via cdouglas)

    MAPREDUCE-962. Fix a NullPointerException while killing task process 
    trees. (Ravi Gummadi via yhemanth)

    MAPREDUCE-1177. Correct setup/cleanup inversion in
    JobTracker::getTaskReports. (Vinod Kumar Vavilapalli via cdouglas)

    MAPREDUCE-1178. Fix ClassCastException in MultipleInputs by adding 
    a DelegatingRecordReader. (Amareshwari Sriramadasu and Jay Booth 
    via sharad)

    MAPREDUCE-1068. Fix streaming job to show proper message if file is 
    is not present. (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-1147. Add map output counters to new API. (Amar Kamat via
    cdouglas)

    MAPREDUCE-915. The debug scripts are run as the job user. (ddas)

    MAPREDUCE-1007. Fix NPE in CapacityTaskScheduler.getJobs(). 
    (V.V.Chaitanya Krishna via sharad)

    MAPREDUCE-28. Refactor TestQueueManager and fix default ACLs.
    (V.V.Chaitanya Krishna and Rahul K Singh via sharad)

    MAPREDUCE-1182. Fix overflow in reduce causing allocations to exceed the
    configured threshold. (cdouglas)

    MAPREDUCE-1239. Fix contrib components build dependencies. 
    (Giridharan Kesavan and omalley) 

    MAPREDUCE-787. Fix JobSubmitter to honor user given symlink path.
    (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-1249. Update config default value for socket read timeout to
    match code default. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1161. Remove ineffective synchronization in NotificationTestCase.
    (Owen O'Malley via cdouglas)

    MAPREDUCE-1244. Fix eclipse-plugin's build dependencies. (gkesavan)

    MAPREDUCE-1075. Fix JobTracker to not throw an NPE for a non-existent
    queue. (V.V.Chaitanya Krishna via yhemanth)

    MAPREDUCE-754. Fix NPE in expiry thread when a TT is lost. (Amar Kamat 
    via sharad)

    MAPREDUCE-1074. Document Reducer mark/reset functionality. (Jothi
    Padmanabhan via cdouglas)

    MAPREDUCE-1267. Fix typo in mapred-default.xml. (Todd Lipcon via cdouglas)

    MAPREDUCE-952. Remove inadvertently reintroduced Task.Counter enum. (Jothi
    Padmanabhan via cdouglas)

    MAPREDUCE-1230. Fix handling of null records in VerticaInputFormat. (Omer
    Trajman via cdouglas)

    MAPREDUCE-1171. Allow shuffle retries and read-error reporting to be
    configurable. (Amareshwari Sriramadasu via acmurthy)

    MAPREDUCE-879. Fix broken unit test TestTaskTrackerLocalization on MacOS.
    (Sreekanth Ramakrishnan via yhemanth)

    MAPREDUCE-1124. Fix imprecise byte counts in Gridmix. (cdouglas)

    MAPREDUCE-1222. Add an option to exclude numeric IP addresses in topologies
    processed by Mumak. (Hong Tang via cdouglas)

    MAPREDUCE-1284. Fix fts_open() call in task-controller that was failing
    LinuxTaskController unit tests. (Ravi Gummadi via yhemanth)

    MAPREDUCE-1143. Fix running task counters to be updated correctly
    when speculative attempts are running for a TIP.
    (Rahul Kumar Singh via yhemanth)

    MAPREDUCE-1241. Use a default queue configuration in JobTracker when
    mapred-queues.xml is unavailable. (Todd Lipcon via cdouglas)

    MAPREDUCE-1301. Fix set up of permission checking script used in 
    localization tests. (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1286. Remove quoting from client opts in TaskRunner. (Yuri
    Pradkin via cdouglas)

    MAPREDUCE-1059. Use distcp.bytes.per.map when adding sync markers in
    distcp. (Aaron Kimball via cdouglas)

    MAPREDUCE-1009. Update forrest documentation describing hierarchical
    queues. (Vinod Kumar Vavilapalli via yhemanth)

    MAPREDUCE-1342. Fixed deadlock in global blacklisting of tasktrackers.
    (Amareshwari Sriramadasu via acmurthy)

    MAPREDUCE-1316. Fixes a memory leak of TaskInProgress instances in
    the jobtracker. (Amar Kamat via yhemanth)

    MAPREDUCE-1359. TypedBytes TestIO doesn't mkdir its test dir first.
    (Anatoli Fomenko via cos)

    MAPREDUCE-1314. Correct errant mapreduce.x.mapreduce.x replacements from
    bulk change. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1365. Restore accidentally renamed test in
    TestTaskTrackerBloacklisting. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1406. Fix spelling of JobContext.MAP_COMBINE_MIN_SPILLS.
    (cdouglas)

    MAPREDUCE-1369. JUnit tests should never depend on anything in conf
    (Anatoli Fomenko via cos)

    MAPREDUCE-1412. Fix timer granularity issue causing failures in
    TestTaskTrackerBlacklisting. (cdouglas)

    MAPREDUCE-1448. Respect --config option in Mumak script. (Hong Tang via
    cdouglas)

    MAPREDUCE-1251. c++ utils doesn't compile. (Eli Collins via tomwhite)

    MAPREDUCE-1522. FileInputFormat may use the default FileSystem for the
    input path. (Tsz Wo (Nicholas), SZE via cdouglas)

    MAPREDUCE-1407. Update javadoc in mapreduce.{Mapper,Reducer} to match
    actual usage. (Benoit Sigoure via cdouglas)

    MAPREDUCE-1258. Fix fair scheduler event log not logging job info.
    (matei)

    MAPREDUCE-1089. Fix NPE in fair scheduler preemption when tasks are
    scheduled but not running. (Todd Lipcon via matei)

    MAPREDUCE-1014. Fix the libraries for common and hdfs. (omalley)

    MAPREDUCE-1111. JT Jetty UI not working if we run mumak.sh 
    off packaged distribution directory. (hong tang via mahadev)

    MAPREDUCE-1133. Eclipse .classpath template has outdated jar files and is
    missing some new ones. (cos)

    MAPREDUCE-1098. Fixed the distributed-cache to not do i/o while holding a
    global lock. (Amareshwari Sriramadasu via acmurthy)

    MAPREDUCE-1158. Fix JT running maps and running reduces metrics.
    (sharad)

    MAPREDUCE-1160. Reduce verbosity of log lines in some Map/Reduce classes
    to avoid filling up jobtracker logs on a busy cluster.
    (Ravi Gummadi and Hong Tang via yhemanth)

    MAPREDUCE-1153. Fix tasktracker metrics when trackers are decommissioned.
    (sharad)

    MAPREDUCE-1128. Fix MRUnit to prohibit iterating over values twice. (Aaron
    Kimball via cdouglas)

    MAPREDUCE-665. Move libhdfs to HDFS subproject. (Eli Collins via dhruba)

    MAPREDUCE-1196. Fix FileOutputCommitter to use the deprecated cleanupJob
    api correctly. (acmurthy)
   
    MAPREDUCE-1244. Fix eclipse-plugin's build dependencies. (gkesavan)

    MAPREDUCE-1140. Fix DistributedCache to not decrement reference counts for
    unreferenced files in error conditions.
    (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1245. Fix TestFairScheduler failures by instantiating lightweight
    Jobtracker. (sharad)

    MAPREDUCE-1260. Update Eclipse configuration to match changes to Ivy
    configuration. (Edwin Chan via cos)

    MAPREDUCE-1152. Distinguish between failed and killed tasks in
    JobTrackerInstrumentation. (Sharad Agarwal via cdouglas)

    MAPREDUCE-1285. In DistCp.deleteNonexisting(..), get class from the
    parameter instead of using FileStatus.class.  (Peter Romianowski via
    szetszwo)

    MAPREDUCE-1294. Build fails to pull latest hadoop-core-* artifacts (cos)

    MAPREDUCE-1213. TaskTrackers restart is faster because it deletes
    distributed cache directory asynchronously. (Zheng Shao via dhruba)

    MAPREDUCE-1265. The task attempt error log prints the name of the 
    tasktracker machine. (Scott Chen via dhruba)

    MAPREDUCE-1201. ProcfsBasedProcessTree collects CPU usage information.
    (Scott Chen via dhruba)

    MAPREDUCE-1326. fi tests don't use fi-site.xml (cos)

    MAPREDUCE-1165. Replace non-portable function name with C99 equivalent.
    (Allen Wittenauer via cdouglas)

    MAPREDUCE-1331. Fixes a typo in a testcase (Devaraj Das)

    MAPREDUCE-1293. AutoInputFormat doesn't work with non-default FileSystems.
    (Andrew Hitchcock via tomwhite)

    MAPREDUCE-1131. Using profilers other than hprof can cause JobClient to
    report job failure. (Aaron Kimball via tomwhite)

    MAPREDUCE-1155. Streaming tests swallow exceptions.
    (Todd Lipcon via tomwhite)

    MAPREDUCE-1212. Mapreduce contrib project ivy dependencies are not included
    in binary target. (Aaron Kimball via tomwhite)

    MAPREDUCE-1388. Move the HDFS RAID package from HDFS to MAPREDUCE.
    (Eli Collins via dhruba)

    MAPREDUCE-1322. Defines default value for staging directory to be user
    based fixing a failing streaming test.
    (Devaraj Das and Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-899. Modified LinuxTaskController to check that task-controller
    has right permissions and ownership before performing any actions.
    (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1443. DBInputFormat can leak connections.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-1457. Fixes JobTracker to get the FileSystem object within 
    getStagingAreaDir within a privileged block. Fixes Child.java to use the
    appropriate UGIs while getting the TaskUmbilicalProtocol proxy and 
    while executing the task. (Jakob Homan via ddas)

    MAPREDUCE-1399. The archive command shows a null error message (nicholas
    via mahadev)

    MAPREDUCE-1305. Improve efficiency of distcp -delete. (Peter Romianowski
    via cdouglas)

    MAPREDUCE-1474. Update forrest documentation for Hadoop Archives. (Mahadev
    Konar via cdouglas)

    MAPREDUCE-1400. Use tr rather than sed to effect literal substitution in
    the build script. (Allen Wittenauer via cdouglas)

    MAPREDUCE-1358. Avoid false positives in OutputLogFilter. (Todd Lipcon via
    cdouglas)

    MAPREDUCE-1490. Fix a NullPointerException that could occur during 
    instantiation and initialization of the DistributedRaidFileSystem. 
    (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1476. Fix the M/R framework to not call commit for special
    tasks like job setup/cleanup and task cleanup.
    (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1398. Fix TaskLauncher to stop waiting for slots on a TIP that
    is killed / failed.
    (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1491. The parity files created by the RAID are combined
    using Hadoop Archive Files (HAR).  (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1378. URL encode link in jobhistory.jsp to avoid errors caused by
    unescaped characters. (E. Sammer via cdouglas)

    MAPREDUCE-1519. RaidNode fails to create new parity file 
    if an older version already exists. (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1537. Fixes a compilation problem in a testcase after commit
    HDFS-984. (Jitendra Nath Pandey via ddas)

    MAPREDUCE-1537. The patch makes the job client call the getDelegationToken
    only when security is enabled. (Jitendra Nath Pandey via ddas)

    MAPREDUCE-1510. RAID should regenerate parity files if they get deleted.
    (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1421. Fix the LinuxTaskController tests failing on trunk after
    the commit of MAPREDUCE-1385. (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-1520. Fix TestMiniMRLocalFS failure caused by regression in
    getting user working dir. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1512. RAID uses HarFileSystem directly instead of
    FileSystem.get (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1435. Fix symlink handling in task work directory when
    cleaning up, essentially to avoid following links.
    (Ravi Gummadi via yhemanth)

    MAPREDUCE-1518. RaidNode does not run the deletion check on the
    directory that stores the parity files.  (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1573. TestStreamingAsDifferentUser fails if run as tt_user.
    (Ravi Gummadi via vinodkv)

    MAPREDUCE-927. Cleanup of task-logs should happen in TaskTracker instead
    of the Child. (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-1578. Decouple HadoopArchives vesrion from HarFileSystem version.
    (Rodrigo Schmidt via szetszwo)

    MAPREDUCE-1422. Fix cleanup of localized job directory to work if files
    with non-deletable permissions are created within it.
    (Amar Kamat via yhemanth)

    MAPREDUCE-1306. Randomize the arrival of heartbeat responses in Mumak.
    (Tamas Sarlos via cdouglas)

    MAPREDUCE-1579. archive: check and possibly replace the space charater
    in source paths.  (szetszwo)

    MAPREDUCE-1536. DataDrivenDBInputFormat does not split date columns correctly.
    (Aaron Kimball via enis)

    MAPREDUCE-890. After HADOOP-4491, the user who started mapred system is 
    not able to run job. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1615. Fix compilation of TestSubmitJob. (cdouglas)

    MAPREDUCE-1508. Protect against NPE in TestMultipleLevelCaching. (Aaron
    Kimball via cdouglas)

    MAPREDUCE-1497. Suppress spurious findbugs warning about IndexCache
    synchronization. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1420. Fix TestTTResourceReporting failure. (Scott Chen via
    cdouglas)

    MAPREDUCE-1480. Correctly initialize child RecordReaders in
    CombineFileInputFormat. (Aaron Kimball via cdouglas)

    MAPREDUCE-1348. Fix block forensics packaging. (Tom White via cdouglas)

    MAPREDUCE-1628. HarFileSystem shows incorrect replication numbers and
    permissions.  (szetszwo via mahadev)

    MAPREDUCE-1602. Fix the error message for the case that src does not
    exist.  (szetszwo)

    MAPREDUCE-1585. Create Hadoop Archives version 2 with filenames
    URL-encoded (rodrigo via mahadev)

    MAPREDUCE-1523. Sometimes rumen trace generator fails to extract the job
    finish time. (dick king via mahadev)

    MAPREDUCE-1635. ResourceEstimator does not work after MAPREDUCE-842.
    (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-889. binary communication formats added to Streaming by
    HADOOP-1722 should be documented. (Klaas Bosteels via tomwhite)

    MAPREDUCE-1031. ant tar target doens't seem to compile tests in contrib
    projects. (Aaron Kimball via tomwhite)

    MAPREDUCE-1692. Removed unused testcase TestStreamedMerge.
    (Sreekanth Ramakrishnan and Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1062. Fix ReliabilityTest to work with retired jobs. (Sreekanth
    Ramakrishnan via cdouglas)

    MAPREDUCE-1409. IOExceptions thrown from FIleOutputCommitter::abortTask
    should cause the task to fail. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1695. Include capacity scheduler in findbugs and javadoc-dev
    targets and also fix existing warnings. (Hong Tang via yhemanth)

    MAPREDUCE-1494. Ensure TestJobDirCleanup verifies the correct paths.
    (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1622. Include missing slf4j dependencies. (cdouglas)

    MAPREDUCE-1515. Accept java5.home from build.properties, not only from the
    command line when building forrest docs. (Al Thompson via cdouglas)

    MAPREDUCE-1618. Add missing javadoc to JobStatus::*JobAcls. (Amareshwari
    Sriramadasu via cdouglas)

    MAPREDUCE-1219. Remove job level metrics from jobtracker metrics to ease 
    undue load on jobtracker. (Sreekanth Ramakrishnan via sharad)

    MAPREDUCE-1604. Add Forrest documentation for Job ACLs.
    (Amareshwari Sriramadasu via yhemanth)

    MAPREDUCE-1705. Archiving and Purging of HDFS parity files should 
    handle globbed policies accurately. (Rodrigo Schmidt via dhruba)

    MAPREDUCE-1612. job conf file is not accessible from job history web page.
    (Ravi Gummadi and Sreekanth Ramakrishnan via vinodkv)

    MAPREDUCE-1397. NullPointerException observed during task failures.
    (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-1728. Oracle timezone strings do not match Java.
    (Aaron Kimball via tomwhite)

    MAPREDUCE-1609. TaskTracker.localizeJob should not set permissions on 
    job log directory recursively. (Amareshwari Sriramadasu via vinodkv)

    MAPREDUCE-1657. After task logs directory is deleted, tasklog servlet 
    displays wrong error message about job ACLs. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1727. TestJobACLs fails after HADOOP-6686. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1611. Refresh nodes and refresh queues doesnt work with service
    authorization enabled. (Amar Kamat via vinodkv)

    MAPREDUCE-1276. Correct flaws in the shuffle related to connection setup
    and failure attribution. (Amareshwari Sriramadasu via cdouglas)

    MAPREDUCE-1372. ConcurrentModificationException in JobInProgress.
    (Dick King and Amareshwari Sriramadasu via tomwhite)

    MAPREDUCE-118. Fix Job.getJobID(). (Amareshwari Sriramadasu via sharad)

    MAPREDUCE-913. TaskRunner crashes with NPE resulting in held up slots,
    UNINITIALIZED tasks and hung TaskTracker. (Amareshwari Sriramadasu and
    Sreekanth Ramakrishnan via vinodkv)

    MAPREDUCE-1725.  Fix MapReduce API incompatibilities between 0.20 and 0.21.
    (tomwhite)

    MAPREDUCE-1606. TestJobACLs may timeout as there are no slots for launching
    JOB_CLEANUP task. (Ravi Gummadi via vinodkv)

    MAPREDUCE-1765. Correct streaming documentation for StreamXmlRecordReader.
    (Corinne Chandel via amareshwari)

    MAPREDUCE-1880. Fix BigDecimal.divide(..) in the pi example.  (szetszwo)

    MAPREDUCE-1885. Revert FileSystem create method that takes CreateFlags
    (MapReduce part of HADOOP-6826). (Ravi Gummadi via tomwhite)

    MAPREDUCE-1870. Harmonize MapReduce JAR library versions with Common and
    HDFS. (tomwhite)

    MAPREDUCE-1791. Remote cluster control functionality needs JavaDocs
    improvement (Konstantin Boudnik)

    MAPREDUCE-1942. 'compile-fault-inject' should never be called directly.
    (Konstantin Boudnik)

    MAPREDUCE-1876. Fixes TaskAttemptStartedEvent to correctly log event type
    for all task types. (Amar Kamat via amareshwari)

    MAPREDUCE-1926. MapReduce distribution is missing build-utils.xml.
    (tomwhite)

    MAPREDUCE-2012. Some contrib tests fail in branch 0.21 and trunk.
    (Amareshwari Sriramadasu via tomwhite)

    MAPREDUCE-1980. Fixes TaskAttemptUnsuccessfulCompletionEvent and
    TaskAttemptFinishedEvent to correctly log event type for all task types.
    (Amar Kamat via amareshwari)

    MAPREDUCE-1856. Extract a subset of tests for smoke (DOA) validation (cos)