HDFS-6783: Merging r1618635 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618636 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-6033. Updated access check for displaying job information 
(Yu Gao via Eric Yang)



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1618649 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1618659 FIXES: HADOOP-10059. RPC authentication and authorization metrics overflow to negative values on busy clusters. Contributed by Tsuyoshi OZAWA and Akira AJISAKA


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MAPREDUCE-6024. Shortened the time when Fetcher is stuck in retrying before concluding the failure by configuration. Contributed by Yunjiong Zhao.
svn merge --ignore-ancestry -c 1618677 ../../trunk/


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HDFS-6561. org.apache.hadoop.util.DataChecksum should support native checksumming (James Thomas via Colin Patrick McCabe)

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HADOOP-10973: Merging r1618682 from trunk to branch-2.

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Update CHANGES.txt for HDFS-6561 which was renamed to HADOOP-10975.

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HDFS-6825. Edit log corruption due to delayed block removal. Contributed by Yongjun Zhang.

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svn merge -c 1618691 FIXES: MAPREDUCE-6036. TestJobEndNotifier fails intermittently in branch-2. Contributed by chang li


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MAPREDUCE-6012. DBInputSplit creates invalid ranges on Oracle. (Wei Yan via kasha)

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HADOOP-10972. Native Libraries Guide contains mis-spelt build line (Peter Klavins via aw)

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HADOOP-10873. Fix dead link in Configuration javadoc (Akira AJISAKA via aw)

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HDFS-6188: Merging r1618727 from trunk to branch-2.

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