Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18253
Agree that it still seems like there's too many moving parts here. I don't
see a whole lot of difference between `BusQueue` and `GroupOfListener` (which
is a weird name, btw). A queue can have a bunch of listeners and a
`LiveListenerBus` can have a bunch of queues. I don't see the need for anything
more complicated than that.
`WithListenerBus` is another thing I don't understand; aside from the
really weird name, it seems to be mostly the same thing as `ListenerBus`.
Also to reinforce a previous comment, your code has a ton of style issues.
It doesn't matter that checkstyle doesn't complain about them; you still have
to follow the code convention of the project or we'll be forever pointing out
style issues in your code.
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