Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/2631#issuecomment-65841397
Due to https://issues.apache.org/jira/browse/SPARK-4672, we now support
checkpointing graphs (by checkpointing their constituent vertices and edges)
with the same semantics as RDDs, meaning that you have to checkpoint an RDD
before calling an action on it.
This PR additionally adds support for checkpointing after calling actions,
but that is not strictly necessary and involves a behavior change to Spark
core. So I think we should close this PR.
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