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Change the GroupCoordinator so that upon receiving the initial JoinGroupRequest for a new or empty group, it will change the group’s state to InitialRebalance and delay the operation by min(rebalanceTimeout, group.initial.rebalance.delay.ms). If new members arrive when the group is in the InitialRebalance state, they will be added to the group and the delay will be extended by reset to min(remainingRebalanceTimeout, group.initial.rebalance.delay.ms) . When the delay expires the group’s state will transition to PreparingRebalance and the join group will be completed.

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