Building queue-based architecture
In the previous sections, you learned about microservice design using RESTful architecture. The RESTful architecture helps your microservice to be easily discoverable, but what happens if your service goes down? RESTful is a contemporary architecture where your client service waits for a response from the host service, which means that the HTTP request blocks the API. Sometimes, your information may be lost due to the unavailability of a downstream service. You must implement some retry logic to retain your information in such cases.
A queue-based architecture solves this problem by adding message queues between services, which hold information on behalf of services. The queue-based architecture provides fully asynchronous communication and a loosely coupled architecture. In a queue-based architecture, your information is still available in the message. If a service crashes, the message can get the process as soon as the service becomes available...
