Hands-On Reactive Programming in Spring 5

Server-side load balancing

In the earliest stages of distributed system development, one of the ways to achieve location transparency and elasticity was to use external load balancers, such as HAProxy/Nginx, as an entry point on top of the group of replicas or as a central load balancer for the whole system. Consider the following diagram:

Diagram 8.1 Example of load balancing with external service

Each section of the numbered diagram is explained as follows:

1. Here, we have a service that plays the role of the gateway and orchestrates all users' requests. As we may see, the gateway makes two calls to Service A and Service B. Suppose that ...