HADOOP-8973. DiskChecker cannot reliably detect an inaccessible disk on Windows with NTFS ACLs. Contributed by Chris Nauroth.

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svn merge -c 1340270 from branch-1 for HADOOP-8329. Build fails with Java 7.


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svn merge -c 1365881 from branch-1 for HDFS-496. Backport: Use PureJavaCrc32 in HDFS.


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MAPREDUCE-782. Merging change r1366280 from branch-1

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