[SPARK-10797] RDD's coalesce should not write out the temporary key#8979

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zzvara wants to merge 4 commits intoapache:masterfrom zzvara:coalesce

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Commits on Oct 5, 2015

Commits on Oct 7, 2015

[SPARK-10797 ] RDD's coalesce should not write out the temporary key
zzvara
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