hard20 pts · first answer countsevent-driven-architecturemicroservicestransactions

Saving to DB and publishing an event

An order service saves an order in PostgreSQL and then publishes OrderCreated to Kafka. If the process crashes between the two steps, the event is lost. Which pattern solves this reliably?

A.Transactional outbox: insert the event into an outbox table in the same DB transaction, and a separate relay publishes it to KafkaB.Publish to Kafka first, then save the order, and ignore failuresC.Wrap the database insert and the Kafka publish in a try/catch and retry onceD.Use a longer Kafka producer timeout

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Saving to DB and publishing an event

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