Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8887#discussion_r42199262
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
 ---
    @@ -249,6 +258,30 @@ class CoarseGrainedSchedulerBackend(scheduler: 
TaskSchedulerImpl, val rpcEnv: Rp
           }
         }
     
    +    /**
    +     * Mark the given executor as disabled; disabled executors are as good 
as lost, except their
    +     * tasks are not yet marked as failed.
    --- End diff --
    
    can you expand on this to explain why we need this intermediate step in the 
middle?


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