Y-axis scaling

Y-axis scaling is all about decomposition of an application into smaller services. Even though there are different ways to accomplish this decomposition, microservices are probably the best approach we can take. When they are combined with immutability and self-sufficiency, there is indeed no better alternative (at least from the prism of y-axis scaling). Unlike x-axis scaling, the y-axis is not accomplished by running multiple instances of the same application but by having multiple different services distributed across the cluster.