The outbox pattern

outbox-pattern · sysdesign · SVG, currentColor

A diagram of the outbox pattern used in distributed systems, showing a database writing a record and an event before it is relayed onward as a message. It's a staple of system design docs and microservices architecture diagrams for explaining reliable event publishing without a dual-write problem.

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outbox patterntransactional outboxmessage queueevent publishingmicroservicesreliable messagingdatabaseenvelopeevent drivendistributed systemsarchitecture diagramevent outboxmessage relaydual write problem

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