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