Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/4253#issuecomment-72497665
isCheckedpointed is call in computeOrReadCheckpoint, which happens on
workers:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/RDD.scala#L248
I think the correct solution won't be using transient to cut lineage but
remove the dependencies properly.
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