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

    https://github.com/apache/spark/pull/6817#discussion_r32484601
  
    --- Diff: 
core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala ---
    @@ -537,10 +537,19 @@ private[spark] class ExecutorAllocationManager(
           }
         }
     
    +    override def onTaskResubmit(taskResubmit: SparkListenerTaskResubmit): 
Unit = {
    +      val stageId = taskResubmit.stageId
    +      allocationManager.synchronized {
    +        val num = stageIdToNumTasks.getOrElse(stageId, 0)
    +        stageIdToNumTasks.update(stageId, num + 1)
    +      }
    +    }
    +
    --- End diff --
    
    @squito, I think when an executor goes down, the stages won't be 
resubmitted. Here I means when a task fails, it will retry, and so a new task 
will append. And in order to let the **ExecutorAllocationManager** knows there 
are new tasks submit, I add **SparkListenerTaskResubmit** event.


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