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https://issues.apache.org/jira/browse/KAFKA-19570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lucas Brutschy updated KAFKA-19570:
-----------------------------------
    Description: 
Offline migration essentially preserves offsets and nothing else. So 
effectively write tombstones for classic group type when a streams heartbeat is 
sent to with the group ID of an empty classic group, and write tombstones for 
the streams group type when a classic consumer attempts to join with a group ID 
of an empty streams group.

AC:
 * Implementation on the broker-side

  was:
Offline migration would essentially preserve offsets and nothing else. So 
effectively write tombstones for classic group type when a streams heartbeat is 
sent to with the group ID of an empty classic group, and write tombstones for 
the streams group type when a classic consumer attempts to join with a group ID 
of an empty streams group.

You can check getOrMaybeCreateConsumerGroup for an example.

AC:
 * Implementation on the broker-side


> Implement offline migration
> ---------------------------
>
>                 Key: KAFKA-19570
>                 URL: https://issues.apache.org/jira/browse/KAFKA-19570
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Lucas Brutschy
>            Assignee: Lucas Brutschy
>            Priority: Major
>              Labels: streams
>
> Offline migration essentially preserves offsets and nothing else. So 
> effectively write tombstones for classic group type when a streams heartbeat 
> is sent to with the group ID of an empty classic group, and write tombstones 
> for the streams group type when a classic consumer attempts to join with a 
> group ID of an empty streams group.
> AC:
>  * Implementation on the broker-side



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