Major Description
Quoting Shixiong's comment from https://github.com/apache/spark/pull/9723 :
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.
Proposed solution is to prevent the call to StreamingContext#stop() in the listener bus's thread.
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