svn merge -c 1511464 FIXES: MAPREDUCE-5425. Junit in TestJobHistoryServer failing in jdk 7. Contributed by Robert Parker


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HDFS-4926. Merge change r1511477 from trunk.

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HDFS-5071. Merging change r1511502 from trunk

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HDFS-4763. Merging change r1511519 from trunk

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