Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/12655#issuecomment-215329471
as I know, duplicate stage occurs:
stage 2 and stage 3 all depends on stage 1
stage 4 depends on stage 2 and stage 3
So, if we get getAncestorShuffleDependencies(stage 4), it will
depth-traverse stage 2-> stage 1, then traverse stage 3 -> stage 1... due to we
use stack, we can't de-duplicate the same stage in this.
if we traverse stage 4 with de-duplication successful, it will in
`shuffleIdToMapStage`, which can tell other rdd which stage had traversed.
right?
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