HADOOP-9624. TestFSMainOperationsLocalFileSystem failed when the Hadoop test root path has "X" in its name. Contributed by Xi Fang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1494363 13f79535-47bb-0310-9956-ffa450edef68
YARN-694. Starting to use NMTokens to authenticate all communication with NodeManagers. Contributed by Omkar Vinit Joshi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1494369 13f79535-47bb-0310-9956-ffa450edef68
YARN-848. Fix NodeManager to register with RM using the fully qualified hostname. Contributed by Hitesh Shah.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1494385 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4461.  DirectoryScanner: volume prefix takes up memory for every block that is scanned (Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1494401 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-226-trunk-gd