Github user squito commented on the issue:
https://github.com/apache/spark/pull/21356
> As an alternative design option, PoisonPill could be handled differently,
since some msgs should have higher priority and can be considered them as part
of your "control plane".
I'm pretty sure the existing use of PoisonPill is intentionally put at the
end of the queue, so that the everything is processed before the queue is shut
down.
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