RabbitMQ Redirect message to another exchange if current message doesn't have any binded queue

Question

Is there a way to configure some policy to redirect messages from one exchange to another exchange, if the current exchange doesn't have any binded queue?

I got a situation where RabbitMQ after restart loose some bindings and my messages were gone.

Answer 1

Yes, the feature is called Alternate Exchanges, and it works like this:

• You set a "policy" which matches exchange A, with a key of 'alternate-exchange' and a value naming exchange B. Alternatively, you can set it as a property directly when creating the exchange.
• Any message routed to exchange A which doesn't match any binding will be routed to exchange B.
• Exchange B processes it in the normal way, and can even have an Alternate Exchange of its own.