YARN-1730. Implemented simple write-locking in the LevelDB based timeline-store. Contributed by Billie Rinaldi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574145 13f79535-47bb-0310-9956-ffa450edef68
YARN-986. Changed client side to be able to figure out the right RM Delegation token for the right ResourceManager when HA is enabled. Contributed by Karthik Kambatla.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574190 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6047 TestPread NPE inside in DFSInputStream hedgedFetchBlockByteRange (stack)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574205 13f79535-47bb-0310-9956-ffa450edef68