Github user kayousterhout commented on the pull request:
https://github.com/apache/spark/pull/246#issuecomment-39043810
I'm not sure how to generate an example of this...I think it can happen
with Shark but maybe @pwendell or @markhamstra can comment here?
I wonder if maybe a better way to handle this would be to add a
cancelStage() method to the DAGScheduler, which already has the mappings of
stages to jobs and vice versa. That way the UI wouldn't have to duplicate this
information.
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