[GitHub] [spark] dydeve opened a new pull request #24676: [SPARK-27804] LiveListenerBus may create multiple AsyncEventQueues with same name in concurrent scene

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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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