Suppoe there are three servers A,B,C in a horizontal load balancing enviroment hosting the same application. If the number of request goes beyond 50 on A, the next server serves the request. when a person's request is served by server A, a session is created on server A. Next time, the request of the same person for the resource goes to Server B. Will a new session for that person be created on server B. If yes then what is the fun of creating multiple sessions one on server A and another on B for a single user. what will happen to the session on server A If a new session is created on server B.
I think there's multiple ways to configure the server. I think it also depends upon the server. I can't remember the names of the configurations but I think a common scenario in a clustered environment is that once a session has been established with a node it will stay with that node. If new sessions need to be directed to another node then I think that occurs before it gets to node A say. I guess another option is to move the session over to another server. I don't think there's the case that you describe where there are multiple sessions for the same user existing on several nodes however.