Unfortunately the upgrade to gradle 5 seems to have made the portable runner tests for flink flaky [1].
My first impression currently is this is not caused by, but more revealing a preexisting issue. At least I have no idea, how that upgrade could have changed the behaviour on direct memory. Any pointers, hint or help here would be deeply appreciated. michel [1] https://issues.apache.org/jira/browse/BEAM-6698
