Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2917
@StephanEwen I've updated the pull request to incorporate your suggestions.
When an IPv6 address is specified, we format it like in the current code base.
When a hostname is specified, we do some simple validation but do not resolve
it. IPv4 addresses are simply used as-is.
I hope that this PR becomes more mergeable in this state. With the help of
some eager users we can further test this in a cluster environment.
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