I have a Glassfish (3.1.2) cluster over 2 computers as nodes, with a mod_jk load balancer.
Are servlet instance variables replicated perfectly? If not, how do I make sure it is?
Are all actions, including method calls and disk writes, replicated perfectly? If not, how do I make sure they are?
These may seem like stupid questions, but I'm not seeking "load balancing" as much as I am seeking exact replication to enable future upgrading without any service interruption. How do I achieve this if it is not already the case?