mukulmurthy commented on issue #25518: [SPARK-26046][SS] Add 
StreamingQueryManager.listListeners()
URL: https://github.com/apache/spark/pull/25518#issuecomment-526775715
 
 
   @HyukjinKwon , it is a little dangerous to add an API to directly break 
other module's custom listeners. But in some cases, it's nice to be able to 
know what listeners are attached and to be able to remove them if desired. I've 
reopened my PR and changed the new API to be listListeners() instead of 
removeAllListeners(), as this exposes new information rather than modifying the 
manager directly. 

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