[SPARK-4672][GraphX]Perform checkpoint() on PartitionsRDD to shorten the lineage#3549

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JerryLead wants to merge 4 commits intoapache:masterfrom

JerryLead:my_graphX_checkpoint

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

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Perform checkpoint() on PartitionsRDD not VertexRDD and EdgeRDD themselves

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