[SPARK-4672][Core]Checkpoint() should clear f to shorten the serialization chain#3545

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JerryLead wants to merge 3 commits intoapache:masterfrom JerryLead:my_core

+6-3

Commits on Dec 1, 2014

Merge pull request #1 from apache/master
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Commits on Dec 2, 2014

Merge branch 'master' of https://github.com/apache/spark

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JerryLead
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checkpoint() should clear the f to avoid StackOverflow error

JerryLead
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