Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/4364#issuecomment-73161788
Yes. That is because `ReceiverTracker.ReceiverLauncher` has been revised
recently to introduce the graceful mode that waits the all receivers to quit
before it stops. It has no timeout setting now.
So if you stop() soon after you start() and you stop() in graceful way,
then you will possibly hit this problem and get stuck indefinitely.
Adding the await termination can do the trick. And we should add a timeout
to `ReceiverTracker.ReceiverLauncher` too. Do you need me to add that in this
pr?
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