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
HDFS-4693. Merge r1468457 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1486098 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8562. Merge r1469996 for HADOOP-9488, r1469998 for YARN-593

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MAPREDUCE-4987. Merge r1470003  from trunk

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Merge remote branch 'origin/branch-2' into branch-2-gd
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

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HDFS-4732. Merge r1471090 from trunk

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HDFS-3131. Merge r1305688 from trunk

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HDFS-4741. Merge r1476585 from trunk

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HADOOP-9290. Merge r1476586 from trunk

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HDFS-4743. Merge r1476591 from trunk

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HDFS-4740. Merge r1476596 from trunk

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HDFS-4722. Merge r1476597 from trunk

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HADOOP-9500. Merge r1476606 from trunk

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HADOOP-9490. Merge r1476609 from trunk

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HDFS-4705. Merge r1476610 from trunk

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