Branching for 0.23.1 release.

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Set version to 0.23.1.

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svn merge -c 1242002 from branch 0.23 to 0.23.1 FIXES MAPREDUCE-3840 JobEndNotifier doesn't use the proxyToUse during connecting


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MAPREDUCE-3770. [Rumen] Zombie.getJobConf() results into NPE. Contributed by Amar Kamat.
svn merge --ignore-ancestry -c 1241845 ../../trunk/
Also cleand up CHANGES.txt a bit.


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merge  -r 1242976:1242977 from branch-0.23. FIXES: MAPREDUCE-3843

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MAPREDUCE-3846. Addressed MR AM hanging issues during AM restart and then the recovery. (vinodkv)
svn merge --ignore-ancestry -c 1243752 ../../trunk/


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MAPREDUCE-3802. Added test to validate that AM can crash multiple times and still can recover successfully after MAPREDUCE-3846. (vinodkv)
svn merge --ignore-ancestry -c 1244178 ../../trunk/


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MAPREDUCE-3858. Task attempt failure during commit results in task never completing. (Tom White via mahadev) - Merging r1244254 from trunk.

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HDFS-2923. Namenode IPC handler count uses the wrong configuration key. (Todd Lipcon) - Merging r1242220 from trunk.

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HDFS-2869. Fix an error in the webhdfs docs for the mkdir op (harsh) - Merging r1243104 from trunk.

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HADOOP-8055. Hadoop tarball distribution lacks a core-site.xml (harsh) - Merging r1243065 from trunk/

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HADOOP-8052. Hadoop Metrics2 should emit Float.MAX_VALUE (instead of Double.MAX_VALUE) to avoid making Ganglia's gmetad core. (Varun Kapoor via Matt) - Merging r1243207 from trunk.

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MAPREDUCE-3757. [Rumen] Fixed Rumen Folder to adjust shuffleFinished and sortFinished times when needed.

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Merge -c 1245637 from trunk to branch-0.23.1 to fix HADOOP-8054. NPE with FilterFileSystem.

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Merge -c 1245276 from trunk to branch-0.23.1 to fix MAPREDUCE-3856. Instances of RunningJob class givs incorrect job tracking urls when mutiple jobs are submitted from same client jvm.

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Preparing for hadoop-0.23.1-rc2.

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Merge -c 1245867 from trunk to branch-0.23.1 to fix MAPREDUCE-3880. Changed LCE binary to be 32-bit.

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Branching for 0.23.2 release.

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Branching for 0.23.2 release.

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Removed 0.23.3 section in branch-0.23.2

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