Event-driven systems are designed for speed, scalability, and decoupling. Messages flow rapidly between services, consumers react almost instantly, and systems can evolve independently without tight coordination. However, this speed introduces a subtle challenge, especially in hybrid cloud environments: ensuring that what is published as an event is consistently reflected in the system’s durable state.
In many modern architectures, event publishing and database persistence are no longer co-located. They span regions, networks, and even cloud providers. While this enables flexibility and scalability, it also introduces latency, partial failures, and timing mismatches that are difficult to reason about.