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https://issues.apache.org/jira/browse/KAFKA-8430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849923#comment-16849923
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Boyang Chen commented on KAFKA-8430:
------------------------------------
After checking the code in `KafkaConsumer`, I found out that the logic for null
`group.id` is like
```// no coordinator will be constructed for the default (null) group id
this.coordinator = groupId == null ? null :(
new ConsumerCoordinator(logContext,```
So if `ConsumerCoordinator` is not constructed, `group.instance.id` is no use
at all.
> Unit test to make sure `group.id` and `group.instance.id` won't affect each
> other
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-8430
> URL: https://issues.apache.org/jira/browse/KAFKA-8430
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Boyang Chen
> Priority: Major
>
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