Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5550#issuecomment-95524581
@XuTingjun If a stage completes, but then is retried and skipped on the
second execution, then it's counted as _both_ "completed" and "skipped". Yes, I
think it should not be counted as "completed". Your change does that, but I'm
saying it might make this more error-prone later to count the stage ID in both
the "completed" and "skipped" sets. It also requires this new `diff` operation.
What about removing a stage ID from the completed set the moment it is retried?
then everything else works out? might be simpler.
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