Merge -r 1242504:1242505 from trunk to branch. FIXES: HADOOP-8035

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HDFS-2764. TestBackupNode is racy. Contributed by Aaron T. Myers.


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merge -r 1242615:1242616 from trunk. FIXES: HADOOP-8048

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Merge r1241554 through r1242605 from 0.23.


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merge  -r 1242789:1242790 from trunk. FIXES: MAPREDUCE-3680

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svn merge -c 1242891 from trunk for HDFS-2931.


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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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Cleaning up hadoop-mapreduce-project/CHANGES.txt a bit.


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merge  -r 1242975:1242976 from trunk. FIXES: MAPREDUCE-3843

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

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Merge -r 1242986:1242987 from trunk to branch. FIXES: HADOOP-8051

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HADOOP-8055. svn merge -c 1243065 from trunk

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Amend HADOOP-8055. Placed changes log in a released section, corrected to 0.23.2. (harsh)

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HDFS-2869. svn merge -c 1243104 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. Contributed by Varun Kapoor.

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MAPREDUCE-3852. Test TestLinuxResourceCalculatorPlugin failing. (Thomas Graves via mahadev) - Merging r1243418 from trunk.

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svn merge -c 1243654 from trunk for HDFS-776.


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HDFS-2815. Merging change r1243673 from trunk to 0.23.


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MAPREDUCE-3837. Job tracker is not able to recover jobs after crash. Contributed by Mayank Bansal.

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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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