[SPARK-22150][CORE] PeriodicCheckpointer fails in case of dependent RDDs#19373

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szhem wants to merge 7 commits intoapache:masterfrom

szhem:SPARK-22150-early-checkpoints

Commits on Sep 27, 2017

[SPARK-22150][CORE] preventing too early removal of checkpoints in case of dependant RDDs
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Commits on Oct 2, 2017

[SPARK-22150][CORE] checking whether two checkpoints have the same checkpointed RDD as their parent to prevent early removal
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[SPARK-22150][CORE] respecting scala style settings
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Commits on Mar 27, 2018

Commits on Mar 29, 2018

[SPARK-22150][CORE] tests to check that checkpoint files of parent checkpointed RDD are removed too
szhem
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