Github user gaborgsomogyi commented on the issue:
https://github.com/apache/spark/pull/19893
The last suspicious big group of threads (at least for me) is
broadcast-exchange.* but as I've seen this is not false positive because the
threadpool never stopped. In BroadcastExchangeExec:141 a new daemon thread pool
created in case of broadcast join which dies when jvm dies.
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