HADOOP-9787. ShutdownHelper util to shutdown threads and threadpools. (Karthik Kambatla via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1509051 13f79535-47bb-0310-9956-ffa450edef68
YARN-502. Fixed a state machine issue with RMNode inside ResourceManager which was crashing scheduler. Contributed by Mayank Bansal.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1509060 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9758.  Provide configuration option for FS/FC symlink resolution.  (Andrew Wang via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1509064 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4310-trunk-gd