Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/5449
@zhangminglei, I think Stephan's idea was to not change any parts of the
`ConnectionUtils`. Instead we should harden the
`ConnectionUtilsTest#testReturnLocalHostAddressUsingHeuristics` by adding a
`Assume.assumeFalse(InetAddress.getLocalHost().isLoopbackAddress)` and checking
that this is also false for the returned address. Moreover, we could check
whether we can actually bind to this address.---
