Transactional Outbox pattern explained with Python examples. One of the most frequently used ways of communication between microservices/modules is asynchronous communications via events. Implementing robust messaging might be challenging at times. In today’s article, I will present you with how to implement the outbox pattern to guarantee the delivery of events and reliable messaging. The outbox pattern (transactional outbox or store and forward event publisher) is the solution. This approach gives us “at least once delivery”. It is worth noting that “at least once delivery” means that the same events might be delivered multiple times. We should keep this in mind and endeavor to create event handlers that are idempotent.
