Hands-On Microservices with Kotlin

Load Balancer

When we have a microservice that needs to send a request to a different microservice, we can use a Service Discovery to get the list of instances available of the services that we want to use. Then we may need to choose one instance among them to perform our request. Eventually, we may need to perform another request, and in that case, we may want to choose a different instance so our request is distributed evenly to the different instances.

To achieve this, we can use the Load Balancer pattern. To perform, for example, a round-robin iteration on the instance of a microservice to distribute calls to them. So when we perform the first request, it will choose the first instance, for the next request, the second instance, and so ...