Follow-up · depth 5
What trade-offs come with Consumer Groups and Rebalance?
What trade-offs come with Consumer Groups and Rebalance?
Answers use simple, clear English.
Audio N/AQuick interview answer
Pros: Elastic scale-out; at-least-once default with offset commit. Cons: Rebalance pauses consumption; sticky assign reduces churn.
Detailed answer
Trade-offs for Consumer Groups and Rebalance: Pros: Elastic scale-out; at-least-once default with offset commit. Cons: Rebalance pauses consumption; sticky assign reduces churn. Decision rule: choose Consumer Groups and Rebalance when the benefits outweigh operational cost for your SLO. Parent context: Baseline: Each partition consumed by one consumer in group. Rebalance on member join/leave — can cause duplicate processing if offsets not committed carefully.
Full explanation
Strong answers state both sides and when you would pick an alternative. Pros: Elastic scale-out; at-least-once default with offset commit. Cons: Rebalance pauses consumption; sticky assign reduces churn.
Follow-up questions
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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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