Github user zsxwing commented on a diff in the pull request:
    --- Diff: 
    @@ -392,9 +392,23 @@ 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](
    -        RemoveExecutor(eid, SlaveLost("Stale executor after cluster 
manager re-registered.")))
    +    // Note: here copy the code of remove executor from DriverEndpoint to 
avoid deadlock(reset
    +    // and removeExecutor both to get the lock of schedulerbackend.)
    +    val reason = SlaveLost("Stale executor after cluster manager 
    +    executorDataMap.toMap.foreach { case (executorId, executorInfo) =>
    --- End diff --
    `executorDataMap` should not be modified outside DriverEndpoint. See the 
comment for `executorDataMap`.

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