Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18760
> I use offer(non-blocking) to control the empty rate in the configuration.
Won't that just block all posts until you hit the empty rate? I don't see a
lot of difference.
But yeah, it would be good to test how things work with queues before
adding yet more features to this part of the code.
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