HDFS-5100. TestNamenodeRetryCache fails on Windows due to incorrect cleanup. Contributed by Chuan Liu.

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HDFS-5103. TestDirectoryScanner fails on Windows. Contributed by Chuan Liu.

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Moving HDFS-5004 into 2.3.0 release section

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MAPREDUCE-5462. In map-side sort, swap entire meta entries instead of indexes for better cache performance. (Sandy Ryza)

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