HDFS-5093. Merging change r1514366 from trunk to branch-2.

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HDFS-5080. Merge change r1514386 from trunk.

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HDFS-5076. Merge change r1514422 from trunk.

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Update CHANGES.txt to move YARN-1045 and MAPREDUCE-5352 to the correct version.


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svn merge -c 1514448 merging from trunk to branch-2 to fix HADOOP-9868.

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Preparing for hadoop-2.1.0-beta rc2.

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Release notes for hadoop-2.1.0-beta rc2

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HDFS-5099. Merging change r1514481 from trunk to branch-2.

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HDFS-2994. If lease soft limit is recovered successfully the append can fail. Contributed by Tao Luo.

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