Github user skonto commented on the issue:
https://github.com/apache/spark/pull/21356
> 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.
Yes I guessed that, I was just thinking that knowing that its to time shut
down is one thing and consuming all input is another. anyway.
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