Maintaining session state

By implementing load balancing and distributing the traffic to multiple instances running our application, we introduce better resiliency and higher availability, but, as a drawback, we also introduce complexity as far as maintaining session state is concerned. In a single server setup, the application can easily maintain the state of the application; since all connections are received by the server, the application has a complete picture of incoming requests. When we implement a load balancer, the load balancer receives the connections and forwards the requests to multiple servers running the application, causing each application part to only be able to see the traffic to itself. When a load balancer detects an instance with a high load, it will try to redirect the users to another instance and if we maintain the session state in the application, the...