Derek Comartin

What’s overengineering? Is the outbox pattern, CQRS, and event sourcing overengineering? Some would say yes. The issue is: what’s your definition? Because if you have that wrong, then you’re making the wrong trade offs. YouTube Check out my YouTube channel, where I post all kinds of content on Software Architecture & Design, including this video showing everything in this post. “The outbox pattern is only used in finance applications where consistency is a must. Otherwise, it’s just overengineering.” Not exactly. “CQRS is overengineering and rarely used even at very high scale companies. One master DB for writes and a bunch of replica… Read More »Read Replicas Are NOT CQRS (Stop Confusing This)

You have some code that handles placing an order. This could be an HTTP API or a message handler. You made it idempotent. You added a unique constraint on some kind of message ID. And somehow… you still end up double charging the customer’s credit card. YouTube Check out my YouTube channel, where I post all kinds of content on Software Architecture & Design, including this video showing everything in this post. Idempotent You did everything right. You have idempotency. You have an inbox table and a unique constraint on that message ID. Your handler should be exactly once, right? Wrong. And… Read More »Your Idempotent Code Is Lying To You