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https://issues.apache.org/jira/browse/KAFKA-1088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-1088.
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Resolution: Abandoned
> Ability to create a shadow consumer group
> -----------------------------------------
>
> Key: KAFKA-1088
> URL: https://issues.apache.org/jira/browse/KAFKA-1088
> Project: Kafka
> Issue Type: New Feature
> Components: consumer
> Reporter: Andrew Olson
> Priority: Major
>
> I have a consumer group API request that hopefully can be included in the
> client rewrite [1] project: the ability to create a new consumer group that
> is initialized to the latest topic/partition offsets of another existing
> group. Our use case is being able to inspect an active group's unprocessed
> messages in a non-invasive manner from an admin or troubleshooting
> perspective. This shadow group would be short-lived and given a randomly
> generated name. It's nice to see that we'll be able to designate it as
> ephemeral as well so that it is automatically cleaned up.
> To obtain this message browsing functionality today with 0.8, we
> programmatically copy the group ZK paths prior to activating the "spy" group
> so that it only sees the unprocessed messages of the target. Obviously not
> ideal, but it worked well as a quick hack since we understand how Kafka
> writes and reads the offset data in ZK.
> [1] https://cwiki.apache.org/confluence/display/KAFKA/Client+Rewrite
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