Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2193
I believe the underlying issue is that there are a bunch of tests that just
don't close their ports properly, as for quite a few tests a MetricRegistry is
fired up silently in the background.
To circumvent this we don't even need a random range or a greater one, just
once that is distinct from the default port range.
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