HADOOP-10562: Merging r1592002 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592003 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10549. Merging change r1592011 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592012 13f79535-47bb-0310-9956-ffa450edef68