Hi, What is he best way to unpersist the RDD in graphx to release memory?
RDD.unpersist
or
RDD.unpersistVertices and RDD..edges.unpersist

I study the source code of Pregel.scala, Both of above were used between
line 148 and line 150. Can anyone please tell me what the different? In
addition, what is the difference to set blocking = false and blocking =
true?

oldMessages.unpersist(blocking = false)
prevG.unpersistVertices(blocking = false)
prevG.edges.unpersist(blocking = false)

Thanks,

Jingyu

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