HDFS-4655. DNA_FINALIZE is logged as being an unknown command by the DN when received from the standby NN. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1463356 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4656. DN heartbeat loop can be briefly tight. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1463358 13f79535-47bb-0310-9956-ffa450edef68
Reverted MAPREDUCE-4974 because of test failures.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1463360 13f79535-47bb-0310-9956-ffa450edef68
YARN-516. Fix failure in TestContainerLocalizer caused by HADOOP-9357. Contributed by Andrew Wang.
svn merge --ignore-ancestry -c 1463362 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1463363 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-YAHOO-226-branch-2-gd