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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