Github user vonnagy commented on the pull request:
https://github.com/apache/spark/pull/9546#issuecomment-154882409
@ted-yu I have found that the call to `listener.join` (line 168) sometimes
still locks up. I have changed the code slightly to use something like
`listener.join(20)` (line 168) so that if the thread does not exit it will give
it a quick break before trying again.
Would you mind adding something like that to your PR?
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