HDFS-5375. Merging change r1533165 from trunk to branch-2.

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HDFS-5379. Merge change r1533181 from trunk.

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HDFS-5336. Merging change r1533183 from trunk to branch-2.

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HADOOP-10055. Merging change r1533188 from trunk to branch-2.

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HDFS-5375. Merge 1533258 from trunk.

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HDFS-5365. Merging change r1533283 from trunk to branch-2.

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HDFS-4511. Cover package org.apache.hadoop.hdfs.tools with unit test (Andrey Klochkov via jeagles)

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HDFS-5365. Merging change r1533574 from trunk to branch-2.

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MAPREDUCE-5457. Add a KeyOnlyTextOutputReader to enable streaming to write out text files without separators (Sandy Ryza)

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MAPREDUCE-5587. TestTextOutputFormat fails on JDK7 (jeagles)

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HDFS-5276. FileSystem.Statistics should use thread-local counters to avoid multi-threaded performance issues on read/write.  (Colin Patrick McCabe)

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YARN-1185. Fixed FileSystemRMStateStore to not leave partial files that prevent subsequent ResourceManager recovery. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1533803 ../../trunk/


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Merge HDFS-5331 make SnapshotDiff.java to a o.a.h.util.Tool interface implementation. Contributed by Vinay.



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YARN-1258: Move to 2.2.1 in CHANGES.txt

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YARN-1288. Make Fair Scheduler ACLs more user friendly (Sandy Ryza)

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HDFS-5382. Merge change r1534368 from trunk.

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HDFS-5347. Merging change r1534377 from trunk

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svn merge -c 1534426 from trunk for HDFS-4885. Improve the verifyBlockPlacement() API in BlockPlacementPolicy.


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HADOOP-9291. enhance unit-test coverage of package o.a.h.metrics2 (Ivan A. Veselovsky via jeagles)

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YARN-1331. Merging change r1534499 from trunk to branch-2.

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