A DISCUSSION ON STATELESS & STATEFUL SERVICES (MANAGING USER STATE ON THE BACKEND)

Summary from the TLDR Web Dev newsletter

Stateless services are easier to scale in distributed systems as more and more services can be added as load increases. However, for stateful services, certain techniques must be used for scaling, such as replication to external storage and distributed caching. In both cases, techniques like load balancers and sticky sessions are used to route traffic to the appropriate nodes.