create branch for HDFS-4949

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HDFS-5049.  Add JNI mlock support.  (Andrew Wang via Colin Patrick McCabe)

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HDFS-5051.  Propagate cache status information from the DataNode to the NameNode  (Andrew Wang via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4949@1513653 13f79535-47bb-0310-9956-ffa450edef68
merge trunk into HDFS-4949 branch

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merge trunk into HDFS-4949 branch


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HDFS-4953. Enable HDFS local reads via mmap. Contributed by Colin Patrick McCabe.

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Add CHANGES.txt for HDFS-4953

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HDFS-5052. Add cacheRequest/uncacheRequest support to NameNode.  (Contributed by Colin Patrick McCabe.)

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HDFS-5050.  Add DataNode support for mlock and munlock  (contributed by Andrew Wang)

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HDFS-5141. Add cache status information to datanode heartbeat. (Contributed by Andrew Wang)

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Add missing file from HDFS-5141

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HDFS-5121.  Add RPCs for creating and manipulating cache pools.  (Contributed by Colin Patrick McCabe)

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commit correct version of HDFS-5121

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HDFS-5163. Miscellaneous cache pool RPC fixes (Contributed by Colin Patrick McCabe)

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HDFS-5169. hdfs.c: translateZCRException: null pointer deref when translating some exceptions (Contributed by Colin Patrick McCabe)

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HDFS-5120. Add command-line support for manipulating cache pools.

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HDFS-5158. Add command-line support for manipulating cache directives

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HDFS-5198. NameNodeRpcServer must not send back DNA_FINALIZE in reply to a cache report.

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HDFS-5195. Prevent passing null pointer to mlock and munlock. Contributed by Chris Nauroth.

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HDFS-5053. NameNode should invoke DataNode APIs to coordinate caching. (Andrew Wang)

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