Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18253
The PR description is good for explaining the new behavior, but can you say
more about the implementation?
IMO, we just need to duplicate the event queue for each important listener
like event logging listener, and non-important listeners can share one event
queue like the current behavior. Then each event queue is processed by an
individual thread.
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