Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2095
Thanks for the review @uce. I think you're right and we should also accept
the `FAILED` state when calling `restart` and simply print a log message
instead of throwing the `IllegalStateException`. But I'm not so sure for any
terminal state because we should not have reached the state `FINISHED`. This
usually indicates a failure and should not go unnoticed.
I will add the `FAILED` check and then merge the PR.
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