Merge -r 754644:754645 from trunk to branch 0.20 to fix HADOOP-4783.

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Merge -r 754846:754847 from trunk onto 0.20 branch. Fixes HADOOP-5490.

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Merge -r 754926:754927 from trunk onto 0.20 branch. Fixes HADOOP-5493.

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HADOOP-5505. Fix JspHelper initialization in the context of
MiniDFSCluster. (Raghu Angadi)

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Merge -r 755034:755035 to move the change of HADOOP-5414 from main to branch 0.20.

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HADOOP-5103. Committing the patch to 0.20 branch.

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Merge -r 755225:755226 from trunk onto 0.20 branch. Fixes HADOOP-5483.

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HADOOP-5281. Prevent sharing incompatible ZlibCompressor instances between GzipCodec and DefaultCodec.


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Merge -r 755347:755348 to move the change of HADOOP-5463 from main to branch 0.20.

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Merge -r 755369:755370 to move the change of HADOOP-5479 from main to branch 0.20.

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Merge -r 755417:755418 to move the change from main to branch 0.20.

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Merge -r 755425:755426 to move the change of HADOOP-5259 from main to branch 0.20.

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HADOOP-5514. Fix JobTracker metrics and add metrics for wating, failed tasks.


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HADOOP-5516. Fix NullPointerException in TaskMemoryManagerThread that comes when monitored processes disappear when the thread is running. Contributed by Vinod Kumar Vavilapalli.

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HADOOP-5382. Support combiners in the new context object API. (omalley)


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Merge -r 755904:755905 from trunk onto 0.20 branch. Fixes HADOOP-5471.

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Merge -r 755937:755938 from trunk onto 0.20 branch. Fixes HADOOP-5522.

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Merge  -r 755959:755960 from trunk onto 0.20 bracnh. Fixes HADOOP-5521.

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Reverted HADOOP-5521 from branch-0.20. I had committed on bracnh 0.20 by mistake.

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Merge -r 755985:755986 from trunk to branch 0.20 to fix HADOOP-5534.

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