medium10 pts · first answer countskafkaconsumersdelivery-semantics

Making a payment consumer safe to replay

A consumer credits wallet balances from payment events and may see the same event twice. Which design makes repeated delivery harmless?

A.Save each event_id with its balance change in one transactionB.Commit offsets before processing each eventC.Use acks=0 on the producer so it never retriesD.Process each partition with two consumers at once

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Making a payment consumer safe to replay

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