HDFS-6125. Merge 1581242 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1581243 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5840. Merge r1581260 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1581261 13f79535-47bb-0310-9956-ffa450edef68