HDFS-3482. Merging r1358812 from trunk to branch-2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1614814 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6441: Merging r1614812 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1614815 13f79535-47bb-0310-9956-ffa450edef68