Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3009#issuecomment-61906977
Actually, there's one subtlety: a single stage might be shared by multiple
jobs, so when we get a StageCompletion event we don't know which job triggered
that stage. Therefore, we don't know which `jobInfo` structure to update.
I _do_ have a job -> stage mapping, so I suppose that I could use this to
query the stageInfo structures to see whether they've succeeded or failed, but
this risks weird behavior where a recomputation of a stage in a later job
causes an earlier job's progress bar to regress. Is there a simple solution
here?
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