HDFS-6256. Clean up ImageVisitor and SpotCheckImageVisitor. Contributed by Akira Ajisaka.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1588524 13f79535-47bb-0310-9956-ffa450edef68
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/trunk@1588546 13f79535-47bb-0310-9956-ffa450edef68
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/trunk@1588559 13f79535-47bb-0310-9956-ffa450edef68