When should you use a fanout exchange?

A fanout exchange broadcasts every message to all queues bound to it, completely ignoring the routing key, which makes it the natural choice whenever every subscriber needs the same copy of an event.

Good fits include:

• Broadcasting a cache-invalidation event to every service instance.
• Fanning out application logs to multiple independent processors (indexing, alerting, archiving).
• Publish/subscribe notifications where many unrelated consumers all care about the same event.

If some consumers should only get a subset of events, a topic exchange is usually the better fit, since fanout offers no filtering at all.

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