Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3009#issuecomment-63392136
As expected, it turns out that we end up with too many completed stages
when stages are recomputed. I can fix this by maintaining mutable hashset of
completed stage ids. I've added a Selenium test that triggers fetch failures
by throwing `FetchFailedException`; take a look at UISeleniumSuite if you're
interested in how it works.
I'm going to work on fixing this issue; I'll also add the "total tasks"
count to the SparkListenerJobStart event, as previously discussed.
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