Merge r1529007 from branch-2 to branch-2.1-beta for MAPREDUCE-5489. MR jobs hangs as it does not use the node-blacklisting feature in RM requests (Zhijie Shen via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1529009 13f79535-47bb-0310-9956-ffa450edef68
Merge r1528640 from trunk to branch-2 for YARN-1141. Updating resource requests should be decoupled with updating blacklist (Zhijie Shen via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1529010 13f79535-47bb-0310-9956-ffa450edef68
Merge -c 1529015 from trunk to branch-2.1-beta to fix YARN-890. Ensure CapacityScheduler doesn't round-up metric for available resources. Contributed by Xuan Gong & Hitesh Shah.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1529019 13f79535-47bb-0310-9956-ffa450edef68