| MAPREDUCE-3952 | In MR2, when Total input paths to process == 1, CombinefileInputFormat.getSplits() returns 0 split. | Major | mrv2 | Zhenxiao Luo | Bhallamudi Venkata Siva Kamesh | 
| HDFS-1765 | Block Replication should respect under-replication block priority | Major | namenode | Hairong Kuang | Uma Maheswara Rao G | 
| MAPREDUCE-4007 | JobClient getJob(JobID) should return NULL if the job does not exist (for backwards compatibility) | Major | mrv2 | Alejandro Abdelnur | Alejandro Abdelnur | 
| HADOOP-6941 | Support non-SUN JREs in UserGroupInformation | Major | . | Stephen Watt | Devaraj Das | 
| HADOOP-8251 | SecurityUtil.fetchServiceTicket broken after HADOOP-6941 | Blocker | security | Todd Lipcon | Todd Lipcon | 
| HDFS-3119 | Overreplicated block is not deleted even after the replication factor is reduced after sync follwed by closing that file | Minor | namenode | J.Andreina | Ashish Singhi | 
| HDFS-3256 | HDFS considers blocks under-replicated if topology script is configured with only 1 rack | Major | . | Aaron T. Myers | Aaron T. Myers | 
| HADOOP-8346 | Changes to support Kerberos with non Sun JVM (HADOOP-6941) broke SPNEGO | Blocker | security | Alejandro Abdelnur | Devaraj Das | 
| MAPREDUCE-4470 | Fix TestCombineFileInputFormat.testForEmptyFile | Major | test | Kihwal Lee | Ilya Katsov | 
| YARN-83 | Change package of YarnClient to include apache | Major | client | Bikas Saha | Bikas Saha | 
| YARN-40 | Provide support for missing yarn commands | Major | client | Devaraj K | Devaraj K | 
| YARN-150 | AppRejectedTransition does not unregister app from master service and scheduler | Major | . | Bikas Saha | Bikas Saha | 
| HADOOP-8878 | uppercase namenode hostname causes hadoop dfs calls with webhdfs filesystem and fsck to fail when security is on | Major | . | Arpit Gupta | Arpit Gupta | 
| HDFS-4072 | On file deletion remove corresponding blocks pending replication | Minor | namenode | Jing Zhao | Jing Zhao | 
| HDFS-2434 | TestNameNodeMetrics.testCorruptBlock fails intermittently | Major | test | Uma Maheswara Rao G | Jing Zhao | 
| MAPREDUCE-4637 | Killing an unassigned task attempt causes the job to fail | Major | mrv2 | Tom White | Mayank Bansal | 
| MAPREDUCE-4278 | cannot run two local jobs in parallel from the same gateway. | Major | . | Araceli Henley | Sandy Ryza | 
| HADOOP-9155 | FsPermission should have different default value, 777 for directory and 666 for file | Minor | . | Binglin Chang | Binglin Chang | 
| HADOOP-8816 | HTTP Error 413 full HEAD if using kerberos authentication | Major | net | Moritz Moeller | Moritz Moeller | 
| HADOOP-9212 | Potential deadlock in FileSystem.Cache/IPC/UGI | Major | fs | Tom White | Tom White | 
| HADOOP-9193 | hadoop script can inadvertently expand wildcard arguments when delegating to hdfs script | Minor | scripts | Jason Lowe | Andy Isaacson | 
| MAPREDUCE-4946 | Type conversion of map completion events leads to performance problems with large jobs | Critical | mr-am | Jason Lowe | Jason Lowe | 
| HADOOP-9231 | Parametrize staging URL for the uniformity of distributionManagement | Major | build | Konstantin Boudnik | Konstantin Boudnik | 
| HDFS-4426 | Secondary namenode shuts down immediately after startup | Blocker | namenode | Jason Lowe | Arpit Agarwal | 
| YARN-354 | WebAppProxyServer exits immediately after startup | Blocker | . | Liang Xie | Liang Xie | 
| HADOOP-8857 | hadoop.http.authentication.signature.secret.file docs should not state that secret is randomly generated | Minor | security | Eli Collins | Alejandro Abdelnur | 
| HDFS-4444 | Add space between total transaction time and number of transactions in FSEditLog#printStatistics | Trivial | . | Stephen Chu | Stephen Chu | 
| YARN-133 | update web services docs for RM clusterMetrics | Major | resourcemanager | Thomas Graves | Ravi Prakash | 
| HADOOP-9190 | packaging docs is broken | Major | documentation | Thomas Graves | Andy Isaacson | 
| HDFS-4288 | NN accepts incremental BR as IBR in safemode | Critical | namenode | Daryn Sharp | Daryn Sharp | 
| HADOOP-9221 | Convert remaining xdocs to APT | Major | . | Andy Isaacson | Andy Isaacson | 
| YARN-343 | Capacity Scheduler maximum-capacity value -1 is invalid | Major | capacityscheduler | Thomas Graves | Xuan Gong | 
| MAPREDUCE-4893 | MR AppMaster can do sub-optimal assignment of containers to map tasks leading to poor node locality | Major | applicationmaster | Bikas Saha | Bikas Saha | 
| MAPREDUCE-4969 | TestKeyValueTextInputFormat test fails with Open JDK 7 | Major | test | Arpit Agarwal | Arpit Agarwal | 
| YARN-364 | AggregatedLogDeletionService can take too long to delete logs | Major | . | Jason Lowe | Jason Lowe | 
| HDFS-4462 | 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS | Major | namenode | Aaron T. Myers | Aaron T. Myers | 
| YARN-360 | Allow apps to concurrently register tokens for renewal | Critical | . | Daryn Sharp | Daryn Sharp | 
| MAPREDUCE-4953 | HadoopPipes misuses fprintf | Major | pipes | Andy Isaacson | Andy Isaacson | 
| HADOOP-9278 | HarFileSystem may leak file handle | Major | fs | Chris Nauroth | Chris Nauroth | 
| YARN-357 | App submission should not be synchronized | Major | resourcemanager | Daryn Sharp | Daryn Sharp | 
| YARN-355 | RM app submission jams under load | Blocker | resourcemanager | Daryn Sharp | Daryn Sharp | 
| HADOOP-9289 | FsShell rm -f fails for non-matching globs | Blocker | fs | Daryn Sharp | Daryn Sharp | 
| MAPREDUCE-4671 | AM does not tell the RM about container requests that are no longer needed | Major | . | Bikas Saha | Bikas Saha | 
| HADOOP-9124 | SortedMapWritable violates contract of Map interface for equals() and hashCode() | Minor | io | Patrick Hunt | Surenkumar Nihalani | 
| YARN-362 | Unexpected extra results when using webUI table search | Minor | . | Jason Lowe | Ravi Prakash | 
| HADOOP-9302 | HDFS docs not linked from top level | Major | documentation | Thomas Graves | Andy Isaacson | 
| HADOOP-9303 | command manual dfsadmin missing entry for restoreFailedStorage option | Major | . | Thomas Graves | Andy Isaacson | 
| MAPREDUCE-5000 | TaskImpl.getCounters() can return the counters for the wrong task attempt when task is speculating | Critical | mr-am | Jason Lowe | Jason Lowe | 
| HDFS-4495 | Allow client-side lease renewal to be retried beyond soft-limit | Major | hdfs-client | Kihwal Lee | Kihwal Lee | 
| HADOOP-9154 | SortedMapWritable#putAll() doesn’t add key/value classes to the map | Major | io | Karthik Kambatla | Karthik Kambatla | 
| MAPREDUCE-5009 | Killing the Task Attempt slated for commit does not clear the value from the Task commitAttempt member | Critical | mrv1 | Robert Parker | Robert Parker | 
| YARN-400 | RM can return null application resource usage report leading to NPE in client | Critical | resourcemanager | Jason Lowe | Jason Lowe | 
| YARN-236 | RM should point tracking URL to RM web page when app fails to start | Major | resourcemanager | Jason Lowe | Jason Lowe | 
| HDFS-4222 | NN is unresponsive and loses heartbeats of DNs when Hadoop is configured to use LDAP and LDAP has issues | Minor | namenode | Xiaobo Peng | Xiaobo Peng | 
| YARN-426 | Failure to download a public resource on a node prevents further downloads of the resource from that node | Critical | nodemanager | Jason Lowe | Jason Lowe | 
| HADOOP-9339 | IPC.Server incorrectly sets UGI auth type | Major | ipc | Daryn Sharp | Daryn Sharp | 
| MAPREDUCE-4871 | AM uses mapreduce.jobtracker.split.metainfo.maxsize but mapred-default has mapreduce.job.split.metainfo.maxsize | Major | mrv2 | Jason Lowe | Jason Lowe | 
| YARN-269 | Resource Manager not logging the health_check_script result when taking it out | Major | resourcemanager | Thomas Graves | Jason Lowe | 
| YARN-376 | Apps that have completed can appear as RUNNING on the NM UI | Blocker | resourcemanager | Jason Lowe | Jason Lowe | 
| YARN-410 | New lines in diagnostics for a failed app on the per-application page make it hard to read | Major | . | Vinod Kumar Vavilapalli | Omkar Vinit Joshi | 
| MAPREDUCE-4794 | DefaultSpeculator generates error messages on normal shutdown | Major | applicationmaster | Jason Lowe | Jason Lowe | 
| HDFS-4128 | 2NN gets stuck in inconsistent state if edit log replay fails in the middle | Major | namenode | Todd Lipcon | Kihwal Lee | 
| HDFS-4532 | RPC call queue may fill due to current user lookup | Critical | namenode | Daryn Sharp | Daryn Sharp | 
| YARN-448 | Remove unnecessary hflush from log aggregation | Major | nodemanager | Kihwal Lee | Kihwal Lee | 
| MAPREDUCE-5043 | Fetch failure processing can cause AM event queue to backup and eventually OOM | Blocker | mr-am | Jason Lowe | Jason Lowe | 
| YARN-345 | Many InvalidStateTransitonException errors for ApplicationImpl in Node Manager | Critical | nodemanager | Devaraj K | Robert Parker | 
| HDFS-4553 | Webhdfs will NPE on some unexpected response codes | Major | webhdfs | Daryn Sharp | Daryn Sharp | 
| YARN-227 | Application expiration difficult to debug for end-users | Major | resourcemanager | Jason Lowe | Jason Lowe | 
| MAPREDUCE-5027 | Shuffle does not limit number of outstanding connections | Major | . | Jason Lowe | Robert Parker | 
| MAPREDUCE-3685 | There are some bugs in implementation of MergeManager | Critical | mrv2 | anty.rao | anty | 
| HDFS-4544 | Error in deleting blocks should not do check disk, for all types of errors | Major | . | Amareshwari Sriramadasu | Arpit Agarwal | 
| MAPREDUCE-5023 | History Server Web Services missing Job Counters | Critical | jobhistoryserver, webapps | Kendall Thrapp | Ravi Prakash | 
| MAPREDUCE-5060 | Fetch failures that time out only count against the first map task | Critical | . | Robert Joseph Evans | Robert Joseph Evans | 
| HDFS-3344 | Unreliable corrupt blocks counting in TestProcessCorruptBlocks | Major | namenode | Tsz Wo Nicholas Sze | Kihwal Lee | 
| HADOOP-9406 | hadoop-client leaks dependency on JDK tools jar | Major | build | Alejandro Abdelnur | Alejandro Abdelnur | 
| MAPREDUCE-5042 | Reducer unable to fetch for a map task that was recovered | Blocker | mr-am, security | Jason Lowe | Jason Lowe | 
| MAPREDUCE-5053 | java.lang.InternalError from decompression codec cause reducer to fail | Major | . | Robert Parker | Robert Parker | 
| MAPREDUCE-5075 | DistCp leaks input file handles | Major | distcp | Chris Nauroth | Chris Nauroth | 
| YARN-109 | .tmp file is not deleted for localized archives | Major | nodemanager | Jason Lowe | Mayank Bansal | 
| HDFS-4581 | DataNode#checkDiskError should not be called on network errors | Major | datanode | Rohit Kochar | Rohit Kochar | 
| YARN-460 | CS user left in list of active users for the queue even when application finished | Blocker | capacityscheduler | Thomas Graves | Thomas Graves | 
| MAPREDUCE-4992 | AM hangs in RecoveryService when recovering tasks with speculative attempts | Critical | mr-am | Robert Parker | Robert Parker | 
| HDFS-4649 | Webhdfs cannot list large directories | Blocker | namenode, security, webhdfs | Daryn Sharp | Daryn Sharp | 
| MAPREDUCE-5137 | AM web UI: clicking on Map Task results in 500 error | Major | applicationmaster | Thomas Graves | Thomas Graves |