Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/9991#issuecomment-160352795
Would things work if `SQLListener` cleaned up after itself when
`SparkListenerApplicationEnd` is received? That would avoid adding hooks in
`SparkContext`.
Also, does the history server suffer from this problem now that it can
instantiate `SQLListener` via `SparkHistoryListenerFactory`? If it does,
handling `SparkListenerApplicationEnd` would probably solve that problem too.
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