HDFS-6256. Merge r1588524 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1588526 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1588546 FIXES: YARN-1940. deleteAsUser() terminates early without deleting more files on error. Contributed by Rushabh S Shah


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1588549 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1588559 FIXES: MAPREDUCE-4937. MR AM handles an oversized split metainfo file poorly. Contributed by Eric Payne


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1588561 13f79535-47bb-0310-9956-ffa450edef68