HDFS-4832. Namenode doesn't change the number of missing blocks in safemode when DNs rejoin or leave. Contributed by Ravi Prakash.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1490803 13f79535-47bb-0310-9956-ffa450edef68
YARN-686. Flatten NodeReport. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1490827 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9509. Implement ONCRPC and XDR. Contributed by Brandon Li

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1490845 13f79535-47bb-0310-9956-ffa450edef68