Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/9546#discussion_r44353658
--- Diff:
core/src/main/scala/org/apache/spark/util/AsynchronousListenerBus.scala ---
@@ -66,6 +66,7 @@ private[spark] abstract class AsynchronousListenerBus[L
<: AnyRef, E](name: Stri
self.synchronized {
processingEvent = true
}
+ if (stopped.get()) return
--- End diff --
instead of doing this here, can you simplify the try block as follows?
```
try {
if (stopped.get()) { return }
val event = eventQueue.poll()
assert(event != null, "event queue was empty but the listener bus was not
stopped")
postToAll(event)
} finally {
```
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