[SPARK-23053][CORE] taskBinarySerialization and task partitions calculate in DagScheduler.submitMissingTasks should keep the same RDD checkpoint status#20244

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ivoson:branch-taskpart-mistype

Commits on Jan 12, 2018

submitMissingTasks should make sure the checkpoint status of stage.rdd is the same when calculate taskSerialization and task partitions

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address comments

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Commits on Feb 6, 2018

address comments

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Commits on Feb 9, 2018

remove the test case and undo the protected[spark] changes

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