Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/9991#issuecomment-160691520
> I didn't clean up the SQLListener after a application end event because
another SQLContext created later still wants to use the same SQLListener.
Sorry, I don't follow. `SparkListenerApplicationEnd` is posted by
`SparkContext.stop`, which is the same place where you're adding the hook to
clean up the listener. So it should behave exactly the same way, no?
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