Alternate exchange là gì và khi nào dùng

https://www.rabbitmq.com/ae.html


Alternate exchange là 1 exchange thay thế. Được chỉ định khi bạn khởi tạo 1 cái exchange. 

Vấn đề là khi bạn đẩy 1 msg với 1 routing-key vào 1 exchange. Nhưng nếu exchange này chưa binding đến bất kì queue nào hoặc là không có routing-key nào macthed với routing-key của msg thì lúc này msg sẽ đc đẩy vào alternate exchange.

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