Github user zsxwing commented on the issue: https://github.com/apache/spark/pull/15481 @mridulm `ask` is very cheap. It just puts the serialized message into a buffer. The current codes now need to duplicate the codes and as @viirya pointed out, it misses `executorDataMap.get(executorId).foreach(_.executorEndpoint.send(StopExecutor))`. How about just the following changes? I agreed that `removeExecutor` doesn't need to be in the `synchronized` block. ``` protected def reset(): Unit = { val executors = synchronized { numPendingExecutors = 0 executorsPendingToRemove.clear() Set() ++ executorDataMap.keys } // 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. executors.foreach { eid => removeExecutor(eid, SlaveLost("Stale executor after cluster manager re-registered.")) } } ```
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