HDFS-5320. Add datanode caching metrics. Contributed by Andrew Wang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540796 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5186. mapreduce.job.max.split.locations causes some splits created by CombineFileInputFormat to fail. Contributed by Robert Parker and Jason Lowe


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540813 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5467. Remove tab characters in hdfs-default.xml. Contributed by Shinichi Yamashita.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540816 13f79535-47bb-0310-9956-ffa450edef68
YARN-1395. Distributed shell application master launched with debug flag can hang waiting for external ls process. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540839 13f79535-47bb-0310-9956-ffa450edef68