| Key | Summary | Component/s |
| MAPREDUCE-2558 | Add queue-level metrics 0.20-security branch | jobtracker |
| MAPREDUCE-2555 | JvmInvalidate errors in the gridmix TT logs | tasktracker |
| MAPREDUCE-2529 | Recognize Jetty bug 1342 and handle it | tasktracker |
| MAPREDUCE-2524 | Backport trunk heuristics for failing maps when we get fetch failures retrieving map output during shuffle | tasktracker |
| MAPREDUCE-2514 | ReinitTrackerAction class name misspelled RenitTrackerAction in task tracker log | tasktracker |
| MAPREDUCE-2495 | The distributed cache cleanup thread has no monitoring to check to see if it has died for some reason | distributed-cache |
| MAPREDUCE-2490 | Log blacklist debug count | jobtracker |
| MAPREDUCE-2479 | Backport MAPREDUCE-1568 to hadoop security branch | tasktracker |
| MAPREDUCE-2456 | Show the reducer taskid and map/reduce tasktrackers for "Failed fetch notification #_ for task attempt..." log messages | jobtracker |
| MAPREDUCE-2451 | Log the reason string of healthcheck script | jobtracker |
| MAPREDUCE-2447 | Set JvmContext sooner for a task - MR2429 | |
| MAPREDUCE-2443 | Fix FI build - broken after MR-2429 | test |
| MAPREDUCE-2429 | Check jvmid during task status report | tasktracker |
| MAPREDUCE-2418 | Errors not shown in the JobHistory servlet (specifically Counter Limit Exceeded) | |
| MAPREDUCE-2415 | Distribute TaskTracker userlogs onto multiple disks | task-controller, tasktracker |
| MAPREDUCE-2413 | TaskTracker should handle disk failures at both startup and runtime | task-controller, tasktracker |
| MAPREDUCE-2411 | When you submit a job to a queue with no ACLs you get an inscrutible NPE | |
| MAPREDUCE-2409 | Distributed Cache does not differentiate between file /archive for files with the same path | distributed-cache |
| MAPREDUCE-118 | Job.getJobID() will always return null | client |
| HDFS-2057 | Wait time to terminate the threads causing unit tests to take longer time | data-node |
| HDFS-2044 | TestQueueProcessingStatistics failing automatic test due to timing issues | test |
| HDFS-2023 | Backport of NPE for File.list and File.listFiles | data-node |
| HDFS-1878 | TestHDFSServerPorts unit test failure - race condition in FSNamesystem.close() causes NullPointerException without serious consequence | name-node |
| HDFS-1836 | Thousand of CLOSE_WAIT socket | hdfs client |
| HDFS-1822 | Editlog opcodes overlap between 20 security and later releases | name-node |
| HDFS-1773 | Remove a datanode from cluster if include list is not empty and this datanode is removed from both include and exclude lists | name-node |
| HDFS-1767 | Namenode should ignore non-initial block reports from datanodes when in safemode during startup | data-node |
| HDFS-1758 | Web UI JSP pages thread safety issue | tools |
| HDFS-1750 | fs -ls hftp://file not working | |
| HDFS-1692 | In secure mode, Datanode process doesn't exit when disks fail. | data-node |
| HDFS-1592 | Datanode startup doesn't honor volumes.tolerated | |
| HDFS-1541 | Not marking datanodes dead When namenode in safemode | name-node |
| HDFS-1445 | HDFS-1443 Batch the calls in DataStorage to FileUtil.createHardLink(), so we call it once per directory instead of once per file | data-node |
| HDFS-1377 | Quota bug for partial blocks allows quotas to be violated | name-node |
| HDFS-1258 | Clearing namespace quota on "/" corrupts FS image | name-node |
| HDFS-1189 | Quota counts missed between clear quota and set quota | name-node |
| HADOOP-7398 | create a mechanism to suppress the HADOOP_HOME deprecated warning | |
| HADOOP-7373 | Tarball deployment doesn't work with {start,stop}-{dfs,mapred} | |
| HADOOP-7364 | TestMiniMRDFSCaching fails if test.build.dir is set to something other than build/test | test |
| HADOOP-7356 | RPM packages broke bin/hadoop script for hadoop 0.20.205 | |
| HADOOP-7330 | The metrics source mbean implementation should return the attribute value instead of the object | metrics |
| HADOOP-7277 | Add Eclipse launch tasks for the 0.20-security branch | build |
| HADOOP-7274 | CLONE - IOUtils.readFully and IOUtils.skipFully have typo in exception creation's message | util |
| HADOOP-7248 | Have a way to automatically update Eclipse .classpath file when new libs are added to the classpath through Ivy for 0.20-* based sources | build |
| HADOOP-7232 | Fix javadoc warnings | documentation |
| HADOOP-7144 | Expose JMX with something like JMXProxyServlet | |
| HADOOP-6255 | Create an rpm integration project |