marmbrus commented on issue #25518: [SPARK-26046][SS] Add 
StreamingQueryManager.listListeners()
URL: https://github.com/apache/spark/pull/25518#issuecomment-527612525
 
 
   I'm pretty flexible on what API we end up building here, but right now there 
is no API at all that allows you to remove a listener unless you happen to keep 
a handle to it or even introspect what listeners are present. To me that is 
kind of weird.
   
   Given that, this seems like a minimal way to enable these use cases that is 
consistent with the APIs already present.

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