HADOOP-8562. Merge r1459586 for HDFS-4615, r1459592 for HDFS-4584, r1459643, r1459642 for HADOOP-9387, r1460086 for HADOOP-9353

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1485932 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8562. Merge r1464780 HDFS-4625, r1465869 YARN-557, r1466148 HDFS-4674, r1466306 HADOOP-9437, r1466746 YARN-487

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1485934 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4885. Merge r1467158 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1485951 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-YAHOO-260-branch-2-gd