[SPARK-14628][CORE] Simplify task metrics by always tracking read/write metrics#12417

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cloud-fan wants to merge 10 commits intoapache:masterfrom

cloud-fan:metrics-refactor

Commits on Apr 15, 2016

Always track ShuffleReadMetrics (i.e. not an option)

rxin
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cloud-fan
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first round commits

rxin
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cloud-fan
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mima and remove more options

rxin
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cloud-fan
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remove more options in StatsReportListener

rxin
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cloud-fan
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fix comment

rxin
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cloud-fan
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fix one test problem

rxin
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cloud-fan
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fix more test cases

rxin
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cloud-fan
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delete a failing test case since it is invalid now

rxin
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cloud-fan
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fix all tests
cloud-fan
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fix style
cloud-fan
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