go-outbox-pattern

The transactional outbox pattern ensures reliable Kafka publishing by writing domain entities and outbox events within a single atomic database transaction, preventing data loss even during application crashes.

The transactional outbox pattern solves event delivery consistency by storing events in a database table alongside domain data. You need it when application crashes might cause lost messages between database commits and Kafka publishes.

You can scaffold a polling worker that reliably publishes events from the outbox table to Kafka. This worker continuously checks the database for unpublished events and dispatches them to the message broker.

Yes, the outbox pattern implementation includes consumer idempotency mechanisms to handle duplicate event deliveries. This ensures downstream services process repeated messages safely without data corruption.

The transactional outbox pattern eliminates dual write problems by atomically committing domain data and outbox events in the same transaction. A separate polling worker then reliably publishes committed events to Kafka.

Application crashes during Kafka publishing can cause duplicate deliveries because the outbox polling worker might resend events. The built-in idempotency checks ensure consumers safely handle these duplicate messages.