[jira] [Created] (KAFKA-2857) ConsumerGroupCommand throws GroupCoordinatorNotAvailableException when describing a non-existent group before the offset topic is created

[Ismael Juma (JIRA)]

Ismael Juma created KAFKA-2857:
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             Summary: 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
            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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