MAPREDUCE-5053. java.lang.InternalError from decompression codec cause reducer to fail (Robert Parker via jeagles)

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MAPREDUCE-4990. Construct debug strings conditionally in ShuffleHandler.Shuffle#sendMapOutput(). (kkambatl via tgraves)

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MAPREDUCE-5028. Maps fail when io.sort.mb is set to high value. (kkambatl via tgraves)

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svn merge -r 1458380:1458376 Reverted MAPREDUCE-5028 from branch-0.23


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svn merge -c 1458466 FIXES: YARN-200. yarn log does not output all needed information, and is in a binary format. Contributed by Ravi Prakash


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