Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4321
I think this pull request will make the Kafka consumer go into a hot busy
waiting loop when it has no partitions assigned.
I would suggest to do a blocking `take()` or so on the
`unassignedPartitionsQueue`.
Also, would be great to get around the instance variable, and simply check
how many partitions are assigned on the KafkaConsumer, or pass this via a
return value of the `reassignPartitions()` function.
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