Github user JoshRosen commented on the issue:
https://github.com/apache/spark/pull/18008
@witgo, I'm using [YourKit Java
Profiler](https://www.yourkit.com/java/profiler/) 2016.02. In these screenshots
I enabled CPU sampling then took a performance snapshot and used the per-thread
view, focusing on the time taken in the live listener bus thread by
right-clicking on the subtree and choosing "focus subtree" from the context
menu.
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