HDFS-4367. Merge change 1429199 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1431462 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4907. Ammendment, forgot to svn add testcase in original commit

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1431511 13f79535-47bb-0310-9956-ffa450edef68