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Discussion thread: TBD

JIRA: here [Change the link from KAFKA-1 to your own ticket]

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

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Under static membership, client user could provide a list of hard-coded `group.instance.id` id`s so that the server could respond to scaling operations more intelligently. For example when we scale up the fleet by defining 4 new client instance ids, the server shall wait until all 4 new members to join the group before kicking out the rebalance, same with scale down. This change requires us to change JoinGroup protocol to batch mode in order to enable admin request to easily scale.

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