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

Baseline: Each partition consumed by one consumer in group. Rebalance on member join/leave — can cause duplicate processing if offsets not committed carefully.

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