YARN-873. YARNClient.getApplicationReport(unknownAppId) returns a null report (Xuan Gong via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506732 13f79535-47bb-0310-9956-ffa450edef68
YARN-875. Application can hang if AMRMClientAsync callback thread has exception (Xuan Gong via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506750 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5213. Re-assess TokenCache methods marked @Private. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506758 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9701. mvn site ambiguous links in hadoop-common. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506762 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5024. Make DatanodeProtocol#commitBlockSynchronization idempotent. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506789 13f79535-47bb-0310-9956-ffa450edef68