dydeve opened a new pull request #24676: [SPARK-27804] LiveListenerBus may create multiple AsyncEventQueues with same name in concurrent scene URL: https://github.com/apache/spark/pull/24676 ## What changes were proposed in this pull request? LiveListenerBus may create multiple AsyncEventQueues with the same name when run in multi-thread scene and those created AsyncEventQueues will be added to queues finally. In this patch, I change the `queues: CopyOnWriteArrayList` to `map: ConcurrentHashMap` which promise that only one of the AsyncEventQueues created with same name will be added to map. ## How was this patch tested? tested in SparkListenerSuite BlacklistTrackerSuite BlockManagerSuite EventLoggingListenerSuite ExecutorAllocationManagerSuite OutputCommitCoordinatorSuite TaskSetBlacklistSuite
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