hard20 pts · first answer countsdata-pipelinesevent-drivendelivery-guarantees

Order saved but event never sent

A service saves an order in its database and then publishes an OrderCreated event to Kafka. Sometimes the save works but the publish fails, and the warehouse never hears about the order. Which pattern fixes this?

A.Publish to Kafka first, then save the order rowB.Retry the publish three times inside the requestC.Save the event in an outbox table in the same transactionD.Have the warehouse poll the service API hourly

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Order saved but event never sent

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