YARN-2830. Add backwords compatible ContainerId.newInstance constructor. Contributed by Jonathan Eagles.
HADOOP-10786. Fix UGI#reloginFromKeytab on Java 8. Contributed by Stephen Chu.
HDFS-7383. DataNode.requestShortCircuitFdsForRead may throw NullPointerException. Contributed by Tsz Wo Nicholas Sze.
HADOOP-10786. Moved to hadoop-2.7.X.
HDFS-7383. Merged to branch-2.6 also.
Updated CHANGES.txt to reflect hadoop-2.6.0 release dates.
YARN-2834. Fixed ResourceManager to ignore token-renewal failures on recovery consistent with the (somewhat incorrect) behaviour in the non-recovery case. Contributed by Jian He.
Fix broken download of directories

(cherry picked from commit 745c9a01243b8eefc72d89d1164d7d010b80983b)
Release Notes for hadoop-2.6.0.
HADOOP-11289. Fix typo in RpcUtil log message. Contributed by Charles Lamb.
Set the release date for 2.5.2
HADOOP-11296. Nfs3FileAttributes should not change the values of rdev, nlink and size in the constructor. Contributed by Brandon Li.
HADOOP-9576. Changed NetUtils#wrapException to throw EOFException instead of wrapping it as IOException. Contributed by Steve Loughran
YARN-2841. RMProxy should retry EOFException.  Contributed by Jian He
YARN-2841: Correct fix version from branch-2.6 to branch-2.7 in the
change log.
YARN-2735. diskUtilizationPercentageCutoff and diskUtilizationSpaceCutoff are initialized twice in DirectoryCollection. (Zhihai Xu via kasha)
YARN-2843. Fixed NodeLabelsManager to trim inputs for hosts and labels so as to make them work correctly. Contributed by Wangda Tan.
HDFS-7381. Decouple the management of block id and gen stamps from FSNamesystem. Contributed by Haohui Mai.
HDFS-7387. NFS may only do partial commit due to a race between COMMIT and write. Contributed by Brandon Li
YARN-570. Time strings are formated in different timezone. (Akira Ajisaka and Peng Zhang via kasha)