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
YARN-1387. RMWebServices should use ClientRMService for filtering applications (Karthik Kambatla via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540851 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5488. Clean up TestHftpURLTimeout. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540894 13f79535-47bb-0310-9956-ffa450edef68
Merging r1540548 through r1540909 from trunk to branch HDFS-2832

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2832@1540910 13f79535-47bb-0310-9956-ffa450edef68