Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/15481
@scwf I think the initial fix with a small change might be sufficient.
What I meant was something like this :
```
protected def reset(): Unit = {
val executors = synchronized {
Set() ++ executorDataMap.keys
}
executors.foreach ( eid => driverEndpoint.askWithRetry[Boolean](
RemoveExecutor(eid, SlaveLost("Stale executor after cluster manager
re-registered.")))
}
```
This will keep the synchronized block restricted to copying the executor
keys, and leave the rest as-is removing the deadlock. Thoughts ?
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