HADOOP-8814. Merging change r1387853 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1512510 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9857. Merging change r1512522 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1512523 13f79535-47bb-0310-9956-ffa450edef68