Github user squito commented on the issue:
https://github.com/apache/spark/pull/19893
hi I'm just getting back, thanks for looking at this -- one quick comment
on the discussion about why there needs to be a whitelist at all. I have a
vague memory of looking at this a while back, and that even when you properly
stop netty, all the cleanup is not done immediately, those threads linger
around briefly for some reason. I dont' recall exactly which set of threads
that applies to.
anyway sounds like you have already figured this out independently, but
just wanted to add my findings.
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