Merge -c 1225726 from trunk to branch-0.23 to fix MAPREDUCE-3608.

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merge HDFS-2574

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merge HADOOP-7504 (harsh)

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merge HDFS-2722 (harsh)

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merge HADOOP-7933 from trunk

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MAPREDUCE-3462. Fix Gridmix JUnit testcase failures. (Ravi Prakash and Ravi Gummadi via amarrk)

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merge MAPREDUCE-3610 (Sho Shimauchi via harsh)

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MAPREDUCE-3490. Fixed MapReduce AM to count failed maps also towards Reduce ramp up. Contributed by Sharad Agarwal and Arun C Murthy.
svn merge -c 1227226 --ignore-ancestry ../../trunk/


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Merge -r 1227224:1227225 from trunk to branch. FIXES: HADOOP-7948

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merge MAPREDUCE-3529 from trunk

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merge MAPREDUCE-3595 from trunk

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MAPREDUCE-3478. Cannot build against ZooKeeper 3.4.0. (Tom White via mahadev) - Merging r1227408 from trunk.

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Merge -c 1227422 from trunk to branch-0.23 to fix MAPREDUCE-3566. Fixed MR AM to construct CLC only once across all tasks.

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Merge -c 1227426 from trunk to branch-0.23 to fix MAPREDUCE-3572. Moved AM event dispatcher to a separate thread for performance reasons.

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HADOOP-7924. svn merge -c 1227423 from trunk


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merge MAPREDUCE-3569 from trunk

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merge MAPREDUCE-3615 from trunk

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HDFS-7808 merging change r1227737 from trunk to 0.23 branch


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HDFS-2710. Add HDFS tests related to HADOOP-7933. Contributed by Siddarth Seth.


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Creating branch off branch-0.23 to merge back protobuf changes in HDFS-2060

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