[SPARK-21902][CORE] Uniform calling for DiskBlockManager.getFile#19133

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caneGuy wants to merge 2 commits intoapache:masterfrom

caneGuy:zhoukang/uniform-api

Commits on Sep 5, 2017

Uniform calling for getFile and print root cause for doPut
caneGuy
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Commits on Sep 9, 2017

Split prs
caneGuy
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