Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2405
Akka will return an empty `ActorIdentity` message if no actor could be
found for the `Identify` message. I assume that this is the case if Akka cannot
reach the remote actor system or if the remote actor system tells that there is
no such actor with the given Akka URL.
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