Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/3710#discussion_r22786686
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala ---
@@ -49,7 +52,8 @@ private[spark] class LiveListenerBus extends
SparkListenerBus with Logging {
// Atomically remove and process this event
LiveListenerBus.this.synchronized {
val event = eventQueue.poll
- if (event == SparkListenerShutdown) {
+ if (event == null) {
+ assert(stopped)
--- End diff --
Added it in #4006
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