HDFS-5647. Merge INodeDirectory.Feature and INodeFile.Feature. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1550469 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5674. Missing start and finish time in mapred.JobStatus. Contributed by Chuan Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1550472 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10044 Improve the javadoc of rpc code (sanjay Radia)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1550486 13f79535-47bb-0310-9956-ffa450edef68
YARN-1325. Modified RM HA configuration validation to also ensure that multiple RMs are configured. Contributed by Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1550524 13f79535-47bb-0310-9956-ffa450edef68