Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/16291
> I think that will be an over-kill. Having a separate thread per listener
simplifies the design.
I don't think it's overkill, and it wouldn't really be that much of a
change from your existing design. It also serves as a way of controlling how
much extra memory you'll need for these things, since right now each listener
would incur in its own thread + message queue.
e.g. you could just have a tagging interface (if listener implements "X"
then it gets its own dedicated dispatch thread, or if you want to get fancy,
you could also define a "group" so that listener in the same group share a
dispatch thread).
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