How would you explain Consumer Groups and Rebalance to a junior engineer?

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→What trade-offs come with Consumer Groups and Rebalance?Open
→How would you explain Consumer Groups and Rebalance to a junior engineer?Open
→Design a small subsystem that relies on Consumer Groups and RebalanceOpen

Parent context — Consumer Groups and Rebalance

Use Consumer Groups and Rebalance as the core idea. Example shape: 6 partitions, 3 consumers → each gets 2 partitions; add 4th consumer triggers rebalance..

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