| HADOOP-4773 | namenode startup error, hadoop-user-namenode.pid permission denied. | Critical | . | Focus | |
| HADOOP-3931 | Bug in MapTask.MapOutputBuffer.collect leads to an unnecessary and harmful ‘reset’ | Blocker | . | Arun C Murthy | Chris Douglas |
| HADOOP-3859 | 1000 concurrent read on a single file failing the task/client | Blocker | . | Koji Noguchi | Johan Oskarsson |
| HADOOP-3813 | RPC queue overload of JobTracker | Major | . | Christian Kunz | Amareshwari Sriramadasu |
| HADOOP-3760 | DFS operations fail because of Stream closed error | Blocker | . | Amar Kamat | Lohit Vijayarenu |
| HADOOP-3758 | Excessive exceptions in HDFS namenode log file | Blocker | . | Jim Huang | Lohit Vijayarenu |
| HADOOP-3707 | Frequent DiskOutOfSpaceException on almost-full datanodes | Blocker | . | Koji Noguchi | Raghu Angadi |
| HADOOP-3685 | Unbalanced replication target | Blocker | . | Koji Noguchi | Hairong Kuang |
| HADOOP-3681 | Infinite loop in dfs close | Blocker | . | Koji Noguchi | Lohit Vijayarenu |
| HADOOP-3678 | Avoid spurious “DataXceiver: java.io.IOException: Connection reset by peer” errors in DataNode log | Blocker | . | Raghu Angadi | Raghu Angadi |
| HADOOP-3633 | Uncaught exception in DataXceiveServer | Blocker | . | Koji Noguchi | Konstantin Shvachko |
| HADOOP-3370 | failed tasks may stay forever in TaskTracker.runningJobs | Critical | . | Zheng Shao | Zheng Shao |
| HADOOP-3002 | HDFS should not remove blocks while in safemode. | Blocker | . | Konstantin Shvachko | Konstantin Shvachko |