Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/9138#issuecomment-163719606
@vanzin just found an issue about this change. Now if the master receives
`RegisterWorker`, it won't use the `workerRef` to send the reply. So there is
no connection from `Master` to the server in `Worker`. If the `Worker` is
killed now, `Master` only observes some client is lost, but the address is just
a client address in Worker and won't match the Worker address. So `Master`
cannot remove this dead `Worker` at once. However, this Worker will be removed
in 60 seconds because of no heartbeat.
See the log here:
https://www.mail-archive.com/[email protected]/msg12332.html
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