| HADOOP-9730 | fix hadoop.spec to add task-log4j.properties | Major | build | Giridharan Kesavan | Giridharan Kesavan |
| HADOOP-9665 | BlockDecompressorStream#decompress will throw EOFException instead of return -1 when EOF | Critical | . | Zhijie Shen | Zhijie Shen |
| HADOOP-9504 | MetricsDynamicMBeanBase has concurrency issues in createMBeanInfo | Critical | metrics | Liang Xie | Liang Xie |
| HDFS-4880 | Diagnostic logging while loading name/edits files | Major | namenode | Arpit Agarwal | Suresh Srinivas |
| HDFS-4699 | TestPipelinesFailover#testPipelineRecoveryStress fails sporadically | Major | test | Chris Nauroth | Chris Nauroth |
| HDFS-4581 | DataNode#checkDiskError should not be called on network errors | Major | datanode | Rohit Kochar | Rohit Kochar |
| HDFS-4261 | TestBalancerWithNodeGroup times out | Major | balancer & mover | Tsz Wo Nicholas Sze | Junping Du |
| MAPREDUCE-5375 | Delegation Token renewal exception in jobtracker logs | Critical | . | Venkat Ranganathan | Venkat Ranganathan |
| MAPREDUCE-5364 | Deadlock between RenewalTimerTask methods cancel() and run() | Major | . | Karthik Kambatla | Karthik Kambatla |
| MAPREDUCE-5351 | JobTracker memory leak caused by CleanupQueue reopening FileSystem | Critical | jobtracker | Sandy Ryza | Sandy Ryza |
| MAPREDUCE-5318 | Ampersand in JSPUtil.java is not escaped | Minor | jobtracker | Bohou Li | Bohou Li |
| MAPREDUCE-5260 | Job failed because of JvmManager running into inconsistent state | Major | tasktracker | zhaoyunjiong | zhaoyunjiong |
| MAPREDUCE-5256 | CombineInputFormat isn't thread safe affecting HiveServer | Major | . | Vinod Kumar Vavilapalli | Vinod Kumar Vavilapalli |
| MAPREDUCE-5206 | JT can show the same job multiple times in Retired Jobs section | Minor | . | Arun C Murthy | Arun C Murthy |
| MAPREDUCE-5148 | Syslog missing from Map/Reduce tasks | Major | tasktracker | Yesha Vora | Arun C Murthy |
| MAPREDUCE-4490 | JVM reuse is incompatible with LinuxTaskController (and therefore incompatible with Security) | Critical | task-controller, tasktracker | George Datskos | sam liu |
| MAPREDUCE-3859 | CapacityScheduler incorrectly utilizes extra-resources of queue for high-memory jobs | Major | capacity-sched | Sergey Tryuber | Sergey Tryuber |