HDFS-5067. Merging change r1522774 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1522776 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5192. Merge change r1522775 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1522777 13f79535-47bb-0310-9956-ffa450edef68