Github user Ngone51 commented on a diff in the pull request: https://github.com/apache/spark/pull/20039#discussion_r158573853 --- Diff: core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala --- @@ -149,7 +158,11 @@ private[spark] class LiveListenerBus(conf: SparkConf) { } this.sparkContext = sc - queues.asScala.foreach(_.start(sc)) + queues.asScala.foreach { q => + q.start(sc) + queuedEvents.foreach(q.post) --- End diff -- Okï¼**synchronized** can avoid this problem.
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