HADOOP-10507. Merging change r1609503 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609506 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10808. Merging change r1609509 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609512 13f79535-47bb-0310-9956-ffa450edef68