Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/9723#issuecomment-156935359
IMO, we should revert
https://github.com/apache/spark/commit/3e0a6cf1e02a19b37c68d3026415d53bb57a576b
The user should not call `stop` or other long-time work in a listener since
it will block the listener thread, and prevent from stopping
SparkContext/StreamingContext.
I cannot see an approach since we need to stop the listener bus's thread
before stopping SparkContext/StreamingContext totally.
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