HDFS-5199. Merge change r1523140 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1524300 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5212. Merge change r1524298 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1524302 13f79535-47bb-0310-9956-ffa450edef68