HADOOP-10602. Merging change r1598337 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598338 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10602. Merging change r1598339 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598340 13f79535-47bb-0310-9956-ffa450edef68