Mastering Spring Cloud

Scaling and grouping

When talking about microservice-based architecture, scalability is always presented as one of its main advantages. The ability to scale up the system by creating multiple instances of a given application is very important. When doing this, different instances of an application are placed in a competing consumer relationship, where only one of the instances is expected to handle a given message. For point-to-point communication, it is not a problem, but in a publish-subscribe model, where the message is consumed by all the receivers, it may be a challenge.