Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5449
This breaks the expected behavior, unfortunately.
The logic is as follows:
- try to connect to JM / RM / ZK and use an interface that you can
connect from, if possible
- if that does not work, fall back to your default interface
(`getLocalHost()`) - the heuristic
If we change step 2 to use `getByName("localhost")` it gives us the
loopback interface which no one external can connect to. That would basically
mean that TM is isolated for any data communication.
The change to `ConnectionUtils` cannot be made like this. Instead, I would
suggest to look at why the instability happens and fix the test instead (retry
or a better test approach).
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