Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3911
Scratch that, there is still a problem that the tests sometimes fail
because of
```
org.apache.kafka.clients.consumer.RetriableCommitFailedException: Commit
offsets failed with retriable exception. You should retry committing offsets.
Caused by:
org.apache.kafka.common.errors.GroupCoordinatorNotAvailableException: The group
coordinator is not available.
```
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