Move YARN-1051 to 2.6
YARN-2615. Changed ClientToAMTokenIdentifier/RM(Timeline)DelegationTokenIdentifier to use protobuf as payload. Contributed by Junping Du
HDFS-7169. Add SE_BAD_FIELD to findbugsExcludeFile.xml.
HADOOP-10404. Some accesses to DomainSocketWatcher#closed are not protected by the lock (cmccabe)
HADOOP-10404.  Commit correct version of patch (cmccabe)
HDFS-7194 Fix findbugs "inefficient new String constructor" warning in DFSClient#PATH (yzhang via cmccabe)
YARN-2644. Fixed CapacityScheduler to return up-to-date headroom when AM allocates. Contributed by Craig Welch
HADOOP-11168. Remove duplicated entry dfs.webhdfs.enabled in the user doc. Contributed by Yi Liu.
MAPREDUCE-6029. TestCommitterEventHandler fails in trunk. Contributed by Mit Desai
HDFS-7186. Document the "hadoop trace" command. (Masatake Iwasaki via Colin P. McCabe)
YARN-1857. CapacityScheduler headroom doesn't account for other AM's running. Contributed by Chen He and Craig Welch
HADOOP-11007. Reinstate building of ant tasks support. Contributed by
Jason Lowe.
Missing files from the previous commit of HADOOP-11007
HADOOP-11169. Fix DelegationTokenAuthenticatedURL to pass the connection Configurator to the authenticator. (Arun Suresh via wang)
HADOOP-11172. Improve error message in Shell#runCommand on OutOfMemoryError. (Yongjun Zhang via wang)
Fixup for CHANGES.txt
HDFS-7128. Decommission slows way down when it gets towards the end. Contributed by Ming Ma.
HADOOP-11166. Remove ulimit from test-patch.sh.
HDFS-7112. LazyWriter should use either async IO or one thread per physical disk. Contributed by Xiaoyu Yao.
YARN-2649. Fixed TestAMRMRPCNodeUpdates test failure. Contributed by Ming Ma