HADOOP-10482. Fix various findbugs warnings in hadoop-common. Contributed by Haohui Mai.
HADOOP-11388. Remove deprecated o.a.h.metrics.file.FileContext. Contributed by Li Lu.
HADOOP-10950. rework heap management vars (John Smith via aw)
HADOOP-6590. Add a username check for hadoop sub-commands (John Smith via aw)
YARN-2437. start-yarn.sh/stop-yarn should give info (Varun Saxena via aw)
HADOOP-11386. Replace \n by %n in format hadoop-common format strings. Contributed by Li Lu.
HDFS-5578. [JDK8] Fix Javadoc errors caused by incorrect or illegal tags in doc comments. Contributed by Andrew Purtell.
HDFS-7475. Make TestLazyPersistFiles#testLazyPersistBlocksAreSaved deterministic. (Contributed by Xiaoyu Yao)
MAPREDUCE-5420. Remove mapreduce.task.tmp.dir from mapred-default.xml. Contributed by James Carman. (harsh)
HDFS-7463. Simplify FSNamesystem#getBlockLocationsUpdateTimes. Contributed by Haohui Mai.
HDFS-7503. Namenode restart after large deletions can cause slow processReport (Arpit Agarwal)
HADOOP-11353. Add support for .hadooprc (aw)
YARN-2917. Fixed potential deadlock when system.exit is called in AsyncDispatcher. Contributed by Rohith Sharmaks
HDFS-7515. Fix new findbugs warnings in hadoop-hdfs. Contributed by Haohui Mai.
HADOOP-11211. mapreduce.job.classloader.system.classes semantics should be order-independent. (Yitong Zhou via gera)
HDFS-7449. Add metrics to NFS gateway. Contributed by Brandon Li
HADOOP-11389. Clean up byte to string encoding issues in hadoop-common. Contributed by Haohui Mai.
HDFS-7497. Inconsistent report of decommissioning DataNodes between dfsadmin and NameNode webui. Contributed by Yongjun Zhang.
MAPREDUCE-6046. Change the class name for logs in RMCommunicator.
Contributed by Sahil Takiar.
YARN-2243. Order of arguments for Preconditions.checkNotNull() is wrong in
SchedulerApplicationAttempt ctor. Contributed by Devaraj K.