Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/16186#discussion_r91240700 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingQueryListenerBus.scala --- @@ -63,18 +83,29 @@ class StreamingQueryListenerBus(sparkListenerBus: LiveListenerBus) } } + /** + * Dispatch events to registered StreamingQueryListeners. Only the events associated queries + * started in the same SparkSession as this ListenerBus will be dispatched to the listeners. + */ override protected def doPostEvent( listener: StreamingQueryListener, event: StreamingQueryListener.Event): Unit = { + val runIdsToReportTo = activeQueryRunIds.synchronized { activeQueryRunIds.toSet } --- End diff -- Why need to clone the set? You can just use `activeQueryRunIds.synchronized { activeQueryRunIds.contains(...) }`. Right?
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