HADOOP-9443. Merge r1470224 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486130 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4725. Merge r1470771 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486144 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4732. Merge r1471090 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486146 13f79535-47bb-0310-9956-ffa450edef68
HDFS-3131. Merge r1305688 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486150 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4741. Merge r1476585 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486151 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9290. Merge r1476586 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486159 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4743. Merge r1476591 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486162 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4740. Merge r1476596 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486174 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4722. Merge r1476597 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486176 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9500. Merge r1476606 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486177 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9490. Merge r1476609 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486179 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4705. Merge r1476610 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486199 13f79535-47bb-0310-9956-ffa450edef68