Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/6352#issuecomment-104652596
Calling will occur not for all RDDs in the stage but only when:
1. RDD has `ShuffleDependency`.
2. RDD has more than 1 dependencies regardless of the dependency type.
And I should have mentioned that calling for the same RDD is not a problem
because the location is already cached.
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