Distributed systems often struggle with one fundamental problem: how to ensure that database changes and event publishing happen together. If the database is updated but the event is not sent, the system becomes inconsistent. If the event is sent but the database fails, the system becomes corrupted. The transactional outbox pattern solves this problem.
Why the outbox pattern is necessary
Traditional event publishing is risky because it relies on two separate operations:
writing to the database,
sending an event to a queue or message broker.
