| YARN-3425 | NPE from RMNodeLabelsManager.serviceStop when NodeLabelsManager.serviceInit failed | Minor | resourcemanager | Bibin A Chundatt | Bibin A Chundatt | 
| HADOOP-12001 | Limiting LDAP search conflicts with posixGroup addition | Blocker | security | Patrick White | Patrick White | 
| YARN-4167 | NPE on RMActiveServices#serviceStop when store is null | Minor | . | Bibin A Chundatt | Bibin A Chundatt | 
| HADOOP-12181 | Fix intermittent test failure of TestZKSignerSecretProvider | Minor | . | Masatake Iwasaki | Masatake Iwasaki | 
| HDFS-7959 | WebHdfs logging is missing on Datanode | Critical | . | Kihwal Lee | Kihwal Lee | 
| HDFS-4210 | Throw helpful exception when DNS entry for JournalNode cannot be resolved | Trivial | ha, journal-node, namenode | Damien Hardy | John Zhuge | 
| HADOOP-13375 | o.a.h.security.TestGroupsCaching.testBackgroundRefreshCounters seems flaky | Major | security, test | Mingliang Liu | Weiwei Yang | 
| HADOOP-12611 | TestZKSignerSecretProvider#testMultipleInit occasionally fail | Major | . | Wei-Chiu Chuang | Eric Badger | 
| HADOOP-13508 | FsPermission string constructor does not recognize sticky bit | Major | . | Atul Sikaria | Atul Sikaria | 
| HDFS-12299 | Race Between update pipeline and DN Re-Registration | Critical | . | Brahma Reddy Battula | Brahma Reddy Battula | 
| HDFS-12371 | “BlockVerificationFailures” and “BlocksVerified” show up as 0 in Datanode JMX | Major | metrics | Sai Nukavarapu | Hanisha Koneru | 
| MAPREDUCE-5124 | AM lacks flow control for task events | Major | mr-am | Jason Lowe | Peter Bacsko | 
| HDFS-12881 | Output streams closed with IOUtils suppressing write errors | Major | . | Jason Lowe | Ajay Kumar | 
| YARN-7661 | NodeManager metrics return wrong value after update node resource | Major | . | Yang Wang | Yang Wang | 
| HDFS-12347 | TestBalancerRPCDelay#testBalancerRPCDelay fails very frequently | Critical | test | Xiao Chen | Bharat Viswanadham | 
| YARN-6632 | Backport YARN-3425 to branch 2.7 | Major | . | Íñigo Goiri | Íñigo Goiri | 
| HADOOP-15143 | NPE due to Invalid KerberosTicket in UGI | Major | . | Jitendra Nath Pandey | Mukul Kumar Singh | 
| MAPREDUCE-7028 | Concurrent task progress updates causing NPE in Application Master | Blocker | mr-am | Gergo Repas | Gergo Repas | 
| HADOOP-12751 | While using kerberos Hadoop incorrectly assumes names with ‘@’ to be non-simple | Critical | security | Bolke de Bruin | Bolke de Bruin | 
| MAPREDUCE-7020 | Task timeout in uber mode can crash AM | Major | mr-am | Akira Ajisaka | Peter Bacsko | 
| HDFS-13126 | Backport [HDFS-7959] to branch-2.7 to re-enable HTTP request logging for WebHDFS | Major | datanode, webhdfs | Erik Krogen | Erik Krogen | 
| HDFS-13120 | Snapshot diff could be corrupted after concat | Major | namenode, snapshots | Xiaoyu Yao | Xiaoyu Yao | 
| HDFS-10453 | ReplicationMonitor thread could stuck for long time due to the race between replication and delete of same file in a large cluster. | Major | namenode | He Xiaoqiao | He Xiaoqiao | 
| MAPREDUCE-7052 | TestFixedLengthInputFormat#testFormatCompressedIn is flaky | Major | client, test | Peter Bacsko | Peter Bacsko | 
| HDFS-13112 | Token expiration edits may cause log corruption or deadlock | Critical | namenode | Daryn Sharp | Daryn Sharp | 
| HADOOP-15206 | BZip2 drops and duplicates records when input split size is small | Major | . | Aki Tanaka | Aki Tanaka | 
| HADOOP-15283 | Upgrade from findbugs 3.0.1 to spotbugs 3.1.2 in branch-2 to fix docker image build | Major | . | Xiao Chen | Akira Ajisaka | 
| HDFS-13195 | DataNode conf page  cannot display the current value after reconfig | Minor | datanode | maobaolong | maobaolong | 
| HADOOP-12862 | LDAP Group Mapping over SSL can not specify trust store | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang | 
| YARN-7249 | Fix CapacityScheduler NPE issue when a container preempted while the node is being removed | Blocker | . | Wangda Tan | Wangda Tan |