Event Driven Architecture: The Hard Parts

Event-driven architecture offers powerful benefits like scaling and decoupling but comes with significant challenges. Key issues include debugging async systems without proper observability, handling eventual consistency, preventing message loss through the outbox pattern, and designing events that avoid tight coupling. The architecture requires idempotent handlers to manage duplicate message delivery, proper dead letter queue handling, and careful consideration of message ordering. While EDA can solve real problems, it adds complexity that isn't always justified - sometimes synchronous systems or monoliths are better choices.