hard20 pts · first answer countsmessage-queueskafkaordering

One big customer on one partition

Kafka records are keyed by merchant ID. One marketplace merchant produces 40% of traffic, so one partition and its consumer lag badly. What is the trade-off of salting the key (merchant + random 0–7)?

A.Ordering is kept and load spreads at no costB.Lag gets worse because there are more keysC.It only works if partitions equal consumersD.Load spreads out, but that merchant loses strict ordering

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One big customer on one partition

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