Github user srowen commented on the issue:
https://github.com/apache/spark/pull/20516
@heary-cao I'm not sure how that addresses the question here, which is just
about cleaning up opened resources in the test code. It's not directly related
to your change, but affects code you are changing. The tests don't fail, it
seems, just seems odd that the tests don't clean up the services they open.
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