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

    https://github.com/apache/spark/pull/16867#discussion_r104515525
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
    @@ -740,6 +743,7 @@ private[spark] class TaskSetManager(
         }
         removeRunningTask(tid)
         info.markFinished(state)
    +    successfulTaskDurations.remove(taskInfos(tid).duration)
    --- End diff --
    
    You mean for shuffle map tasks, where the task completed successfully but 
then the executor was lost later, so we re-run the task?  That case seems OK to 
leave the task time in, because it's still a valid task completion time.


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