[WIP] Measurement for SPARK-16929.#17112

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jinxing64 wants to merge 11 commits intoapache:masterfrom

jinxing64:SPARK-16929-measurement

Commits on Mar 11, 2017

[SPARK-16929] Improve performance when check speculatable tasks.
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Commits on Mar 14, 2017

Get rid of 'remove' and fix doc in MedianHeap
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scheduleAtFixedRate -> scheduleWithFixedDelay
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Commits on Mar 16, 2017

Change some comment and unit tests.
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Change back to scheduleAtFixedRate
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scheduleAtFixedRate -> scheduleWithFixedDelay
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Refine test.
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mod
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Commits on Mar 18, 2017

Measurement for SPARK-16929.
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Merge branch 'SPARK-16929' into SPARK-16929-measurement
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update
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