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

    https://github.com/apache/spark/pull/3483#discussion_r21009879
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
 ---
    @@ -127,7 +127,13 @@ class CoarseGrainedSchedulerBackend(scheduler: 
TaskSchedulerImpl, val actorSyste
             makeOffers()
     
           case KillTask(taskId, executorId, interruptThread) =>
    -        executorDataMap(executorId).executorActor ! KillTask(taskId, 
executorId, interruptThread)
    +        executorDataMap.get(executorId) match {
    +          case Some(executorInfo) =>
    +            executorInfo.executorActor ! KillTask(taskId, executorId, 
interruptThread)
    +          case None =>
    +            // Ignoring the task kill since the executor is not registered.
    +            logWarning(s"Attempted to kill task $taskId for unknown 
executor $executorId.")
    +        }
    --- End diff --
    
    No, I don't feel all that strongly about it, but neither does it strike me 
as awkward or a misuse of monadic operators.  Unit is a perfectly valid return 
type, and this is just idiomatic Scala -- which I prefer to use consistently 
over Scala written for non-Scala programmers.


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