Hi, I read an article about clustering in tomcat on theserverside.com, but have some questions about it.
There is a statement to use "In-Memory"-Replication in favour of "Database/Filesystem"-Replication to avoid problems like (speed, external dependencies, ...). Most of our projects make use of gui-components like trees, pager and pagecontrols, whose state are stored in the HttpSession-Object. Depending on the project, the amount of used memory for these objects can be really huge ( in a equivalent php version, a serialized session can be up to 1mb ). Would this means, is that 200 concurrent HttpSessions ( each one ~ 1mb ) would be replicated to each Tomcat-Server in my cluster and therefore each server requires ~ 200mb RAM to hold all concurrent HttpSession-Objects when using "In-Memory"-Replication ? Are there any mechanisms to share those huge HttpSessions over several servers without the needed RAM of ~200mb per server ? Any comment would be really appreciated. regards, Jan Zimmek
