Github user davies commented on a diff in the pull request:

    https://github.com/apache/spark/pull/3027#discussion_r24843768
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/TaskResultGetter.scala ---
    @@ -95,25 +96,30 @@ private[spark] class TaskResultGetter(sparkEnv: 
SparkEnv, scheduler: TaskSchedul
       def enqueueFailedTask(taskSetManager: TaskSetManager, tid: Long, 
taskState: TaskState,
         serializedData: ByteBuffer) {
         var reason : TaskEndReason = UnknownReason
    -    getTaskResultExecutor.execute(new Runnable {
    -      override def run(): Unit = Utils.logUncaughtExceptions {
    -        try {
    -          if (serializedData != null && serializedData.limit() > 0) {
    -            reason = serializer.get().deserialize[TaskEndReason](
    -              serializedData, Utils.getSparkClassLoader)
    +    try {
    --- End diff --
    
    This is not related change, it mute the exception when you cancel a job.


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