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

    https://github.com/apache/spark/pull/16855#discussion_r100187114
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
    @@ -874,7 +874,8 @@ private[spark] class TaskSetManager(
         // and we are not using an external shuffle server which could serve 
the shuffle outputs.
         // The reason is the next stage wouldn't be able to fetch the data 
from this dead executor
         // so we would need to rerun these tasks on other executors.
    -    if (tasks(0).isInstanceOf[ShuffleMapTask] && 
!env.blockManager.externalShuffleServiceEnabled) {
    +    if (tasks(0).isInstanceOf[ShuffleMapTask] && 
!env.blockManager.externalShuffleServiceEnabled
    +      && !isZombie) {
    --- End diff --
    
    Also I'm concerned that we might need some of the functionality below even 
when the TSM is a zombie.  While the TSM shouldn't tell the DAGScheduler that 
the task was resubmitted, I think it does need to notify the DAGScheduler that 
tasks on the executor are finished (otherwise they'll never be marked as 
finished in the UI, for example), and I also think it needs to properly update 
the running copies of the task.


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