Github user liyezhang556520 commented on the pull request: https://github.com/apache/spark/pull/3825#issuecomment-68428197 I think a better way is to use the Akka's [persistence](http://doc.akka.io/docs/akka/snapshot/scala/persistence.html) feature, recover the actor's state when actor restart. Anyway, still this PR has it's value that when an unregistered worker has heartbeat to this Master, this master should not just ignore it, at least should tell the worker it has disconnected. What do you think @JoshRosen ?
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