Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9546#issuecomment-156846877
I think that this has caused the
"org.apache.spark.scheduler.EventLoggingListenerSuite.End-to-end event logging"
test to become flaky in Jenkins.
I believe that this patch may have changed the behavior of the listener bus
during shutdown. According to the `stop()` method's Scaladoc:
```
/**
* Stop the listener bus. It will wait until the queued events have been
processed, but drop the
* new events after stopping.
*/
```
It looks like this patch just changes things so that we halt immediately
once the `stopped` flag has been set rather than waiting for the queue to drain.
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