YARN-353. Add Zookeeper-based store implementation for RMStateStore. Contributed by Bikas Saha, Jian He and Karthik Kambatla.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1524829 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5504. mapred queue -info inconsistent with types (Kousuke Saruta via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1524841 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5488. Changed MR client to keep trying to reach the application when it sees that on attempt's AM is down. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1524856 13f79535-47bb-0310-9956-ffa450edef68