[SPARK-4307] Initialize FileDescriptor lazily in FileRegion.#3172

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rxin wants to merge 4 commits intoapache:masterfrom

Commits on Nov 9, 2014

[SPARK-4307] Initialize FileDescriptor lazily in FileRegion.
rxin
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Commits on Nov 10, 2014

Commits on Nov 11, 2014

Added reference to Netty's DefaultFileRegion
rxin
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