Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/17244#discussion_r105490080 --- Diff: core/src/main/scala/org/apache/spark/TaskContextImpl.scala --- @@ -57,57 +68,75 @@ private[spark] class TaskContextImpl( // Whether the task has failed. @volatile private var failed: Boolean = false + // Throwable that caused the task to fail + private var failure: Throwable = _ + // If there was a fetch failure in the task, we store it here, to make sure user-code doesn't // hide the exception. See SPARK-19276 @volatile private var _fetchFailedException: Option[FetchFailedException] = None + @GuardedBy("this") override def addTaskCompletionListener(listener: TaskCompletionListener): this.type = { - onCompleteCallbacks += listener + synchronized { + if (completed) { + listener.onTaskCompletion(this) + } + // Always add the listener because it is legal to call them multiple times. --- End diff -- I did not realize this, interesting !
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