Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/10464#issuecomment-167661660
Looks a race condition in `restart` and `finally { ... socket.stop() ...}`.
`restart` will start a new thread and call `receiver.onStart`. So
`receiver.onStart` may run before `socket.stop()`.
However, it looks unlikely since it sleeps 2 seconds before calling
`startReceiver()`.
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