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https://issues.apache.org/jira/browse/KAFKA-4047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15423212#comment-15423212
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Vahid Hashemian commented on KAFKA-4047:
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Thanks for verifying.
> Return more useful information from ConsumerGroupCommand for consumer groups
> that are rebalancing or manually assigned
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-4047
> URL: https://issues.apache.org/jira/browse/KAFKA-4047
> Project: Kafka
> Issue Type: Improvement
> Components: consumer, tools
> Affects Versions: 0.9.0.1, 0.10.0.0, 0.10.0.1
> Reporter: Sean McKibben
> Priority: Minor
>
> For consumers which are manually assigned topic partitions, or for offsets
> which are otherwise manually committed to brokers using the new consumer API,
> the existing ConsumerGroupCommand tools are operationally insufficient.
> There are many use cases in production operation when it is important to be
> able to easily retrieve the stored offsets and calculated lag of a consumer
> group, even if the group is rebalancing or partition assignment information
> is indeterminate. Often these cases involve a misbehaving or crashed client
> application, and having the ConsumerGroupCommand return {{Consumer group
> `myGroupID` does not exist or is rebalancing.}} instead of the information it
> does know is not very helpful. Additionally, when manual offset commits are
> used, or the automatic consumer group subscription management is not used,
> the same message is returned by the tool. In these cases, the offsets are
> actually stored and available even though the broker/coordinator doesn't have
> information about partition ownership.
> Previously, this was a non-issue as a ZK client could be leveraged relatively
> easily to get important information like the last stored offset positions, or
> consumer-offset-checker would return more information in its responses. With
> the new consumer, however, the process for getting offset and lag is not as
> straightforward, and tools to provide this information at the operational
> level are necessary as part of a Kafka installation.
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