[SPARK-14293] Improve shuffle load balancing and minimize network data transmission.#12085

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SCTS:issue-14293

Commits on Mar 31, 2016

Improve shuffle load balancing and minimize network data transmission.
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Improve shuffle load balancing and minimize network data transmission.
peterpc0701
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Commits on May 29, 2016

fix some minor formatting things about this issue
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