Github user carsonwang commented on the pull request:
https://github.com/apache/spark/pull/9991#issuecomment-160494777
@vanzin , I wrapped the calls to the hooks with
`Utils.tryLogNonFatalError`. I didn't clean up the `SQLListener` after a
application end event because another `SQLContext` created later still wants to
use the same `SQLListener`. I think the history server does not have the
problem because there is no reference to the `SQLListener` from a companion
object in that case.
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