Can anyone break down the core principles behind event‑driven architecture? Specifically, I'm curious about how events are produced, propagated, and consumed across loosely coupled services, and what mechanisms ensure reliability and ordering without a central orchestrator. How do typical messaging patterns like pub/sub or event sourcing fit into this model?
How does the concept of 'event-driven architecture' work in modern systems?
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Unlike a classic request‑response API where the caller directly invokes a service, event‑driven architecture relies on a broker (e.g., Kafka, RabbitMQ) that lets producers publish events and multiple consumers subscribe via pub/sub, with the broker’s log handling durability, replay, and ordering through offsets and acknowledgements. Event sourcing takes this a step further by persisting every state‑changing event as an immutable record, so reliability comes from the same log‑based storage rather than a central orchestrator.