YARN-2914. [YARN-1492] Potential race condition in Singleton implementation of SharedCacheUploaderMetrics, CleanerMetrics, ClientSCMMetrics. (Varun Saxena via kasha)
HADOOP-10852 Fix thread safety issues in NetgroupCache. (Benoy Antony)
HADOOP-11410. Make the rpath of libhadoop.so configurable (cmccabe)
MAPREDUCE-6166. Reducers do not validate checksum of map outputs when fetching directly to disk. (Eric Payne via gera)
MAPREDUCE-6191. Improve clearing stale state of Java serialization
                testcase.  (Sam Liu via Eric Yang)
HADOOP-11412 POMs mention "The Apache Software License" rather than "Apache License". (Herve Boutemy via stevel)
HDFS-6425. Large postponedMisreplicatedBlocks has impact on blockReport latency. Contributed by Ming Ma.
YARN-2762. Fixed RMAdminCLI to trim and check node-label related arguments before sending to RM. Contributed by Rohith Sharmaks
HDFS-7494. Checking of closed in DFSInputStream#pread() should be protected by synchronization (Ted Yu via Colin P. McCabe)
HDFS-7536. Remove unused CryptoCodec in org.apache.hadoop.fs.Hdfs. Contributed by Haohui Mai.
HADOOP-11321. copyToLocal cannot save a file to an SMB share unless the user has Full Control permissions. Contributed by Chris Nauroth.