Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/22112
> IMO we should traverse the dependency graph and rely on how ShuffledRDD
is configured
A trivial point here - Since `ShuffleDependency` is also a DeveloperAPI,
it's possible for users to write a customized RDD that behaves like
`ShuffleRDD`, so we may want to depend on dependencies rather than RDDs.
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