Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3515#issuecomment-65183834
I haven't had a chance to dig into this much more, but perhaps this could
be due to streaming checkpointing; if RDDs' dependencies change after
checkpointing, then that might mean that we need to re-walk the stage /
dependency graph rather than relying on the cached results of the earlier
traversal.
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