[SPARK-23040][CORE]: Returns interruptible iterator for shuffle reader#20449

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advancedxy:SPARK-23040

Commits on Jan 31, 2018

[SPARK-23040][CORE]: Returns interruptible iterator for shuffle reader
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Commits on Feb 25, 2018

Update comments and tests.
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Commits on Feb 26, 2018

Fix style issues and update comments
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Commits on Feb 27, 2018