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https://issues.apache.org/jira/browse/KAFKA-2857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328866#comment-15328866
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Jason Gustafson commented on KAFKA-2857:
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[~vahid] That's a good question. Maybe we can get clarification from [~ijuma]
or [~junrao], but the previous sentence in the description suggests maybe the
intent is to distinguish the case of a group not existing? I think it would be
fine here to give the user a message which tells them that the offsets topic is
unavailable and points out that it takes a little time on a new cluster to
create it. But if we can't find the coordinator, then there's really no way to
know whether the group "exists" or not.
> ConsumerGroupCommand throws GroupCoordinatorNotAvailableException when
> describing a non-existent group before the offset topic is created
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-2857
> URL: https://issues.apache.org/jira/browse/KAFKA-2857
> Project: Kafka
> Issue Type: Bug
> Components: tools
> Reporter: Ismael Juma
> Assignee: Ishita Mandhan
> Priority: Minor
>
> If we describe a non-existing group before the offset topic is created, like
> the following:
> {code}
> bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --new-consumer
> --describe --group gggg
> {code}
> We get the following error:
> {code}
> Error while executing consumer group command The group coordinator is not
> available.
> org.apache.kafka.common.errors.GroupCoordinatorNotAvailableException: The
> group coordinator is not available.
> {code}
> The exception is thrown in the `adminClient.describeConsumerGroup` call. We
> can't interpret this exception as meaning that the group doesn't exist
> because it could also be thrown f all replicas for a offset topic partition
> are down (as explained by Jun).
> Jun also suggested that we should distinguish if a coordinator is not
> available from the case where a coordinator doesn't exist.
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