Github user concretevitamin commented on the pull request:
https://github.com/apache/spark/pull/221#issuecomment-38610336
Thanks for the input, @andrewor14. Yeah exposing the listener bus enables
users to post events to it. I think your second workaround does the job and is
simpler to implement than the first; we could set the flag when the shut down
message is being processed (it is possible for the bus to be empty but there
are events coming). If everyone agrees I can close this PR & send in a new one.
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