Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18253
What's the processing model now? Previously it's very simple, we have an
event queue, and many threads send events to this queue, and one thread poll
events from this and call listeners. What is it now?
Can you give a summary about the implementation? e.g. How you change the
API in `ListenerBus` and what's the new class hierarchy for listener buses?
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