HADOOP-9660. Merging change r1499142 from branch-2 to branch-2.2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.2@1539533 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9660. Merging change r1539536 from branch-2 to branch-2.2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.2@1539537 13f79535-47bb-0310-9956-ffa450edef68