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A walkthrough of the Outbox pattern for solving the dual-write problem in distributed systems, implemented in Go with PostgreSQL and Redis. The core issue is that a database commit and a message broker publish are not atomic — if one fails, the system ends up in an inconsistent state. The Outbox pattern solves this by writing messages to a dedicated outbox table within the same database transaction, then using a relay process to forward them to the message broker. The implementation uses PostgreSQL's FOR UPDATE SKIP LOCKED to safely handle concurrent relay workers. The video also covers an alternative approach using PostgreSQL's Write-Ahead Log (WAL) and logical replication via the pglogrepl library for lower-latency change data capture, avoiding the need for a separate outbox table.

How to implement the Outbox pattern in Go and Postgres

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