YARN-245. Fixed NodeManager to handle duplicate responses from ResourceManager. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1508157 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1508159 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5027. On startup, DN should scan volumes in parallel. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1508166 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-MAPREDUCE-4884-branch-2-gd