Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/3061
@StephanEwen unfortunately Akka doesn't support hostname verification, so
the Akka remoting code wasn't touched. I suppose we could fix it in Flakka,
at which time we'd need to move to full canonicalization of the hostname (as
opposed to the lower-casing and other such normalization efforts that take
place as of FLINK-2821).
Yeah I think this is safe to take.
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