The Data Lorax created KAFKA-2901:
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Summary: Extend ListGroups and DescribeGroup APIs to cover offsets
Key: KAFKA-2901
URL: https://issues.apache.org/jira/browse/KAFKA-2901
Project: Kafka
Issue Type: Improvement
Components: consumer
Affects Versions: 0.9.0.0
Reporter: The Data Lorax
Assignee: Neha Narkhede
Fix For: 0.9.0.1
The {{ListGroupsRequest}} and {{DescribeGroupsRequest}} added to 0.9.0.0 allow
admin tools to get details of consumer groups now that this information is not
stored in ZK.
The brokers also now store offset information for consumer groups. At present,
there is no API for admin tools to discover the groups that brokers are storing
offsets for.
For example, if a consumer is using the new consumer api, is storing offsets in
Kafka under the groupId 'Bob', but is using manual partition assignment, then
the {{groupCache}} in the {{GroupMetadataManager}} will not contain any
information about the group 'Bob'. However, the {{offsetCache}} in the
{{GroupMetadataManager}} will contain information about 'Bob'.
We need to extend the List/Describe groups API to allow admin tools to discover
'Bob' and allow the partition offsets to be retrieved.
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