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

    https://github.com/apache/spark/pull/15481#discussion_r83991614
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
 ---
    @@ -393,7 +393,7 @@ class CoarseGrainedSchedulerBackend(scheduler: 
TaskSchedulerImpl, val rpcEnv: Rp
         // Remove all the lingering executors that should be removed but not 
yet. The reason might be
         // because (1) disconnected event is not yet received; (2) executors 
die silently.
         executorDataMap.toMap.foreach { case (eid, _) =>
    -      driverEndpoint.askWithRetry[Boolean](
    +      driverEndpoint.send(
    --- End diff --
    
    This will only be invoked in yarn client mode when AM is failed and some 
lingering executors are existed, such situation may not be happened normally as 
I know. So I think it should be OK to call `send`.


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