Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/4006#issuecomment-71503764
I see. That makes sense. However I still don't see the need for a separate
`ListenerHelper` trait. In my mind `SparkListenerBus` should extend
`ListenerBus[L, E]` instead of `ListenerHelper` directly. If that's the case,
then the only class that's actually implementing `ListenerHelper` will be
`ListenerBus`, at which point you can just merge the trait with the class
itself. Is there a reason for keeping around the trait?
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