Tips on customizing session manager

Tomcat internal cluster session manager can be used on a test system, but it has performance issue on a production system. (The problem of Tomcat session cluster) From my benchmark test, total TPS saturated from 3 instances. (It depends on H/W spec and business logic) Therefore I needed to make a custom session manager which …

About Tomcat’s default session manager

Tomcat's default session manager is "StandardManager". (org.apache.catalina.session.StandardManager) Without specific setting, StandardManager manages session data. Class hierarchy All session manager must implement Manager interface. (Cluster manager also implements Manager)   How StandardManager works? Usually, you create session as follows. What happens inside this code? HttpServletRequest.getSession() -> ApplicationHttpRequest.getSession() -> ManagerBase.createSession() -> StandardSession.setId() -> StandManager.add() Except HttpServletRequest, all …

The problem of Tomcat session cluster

Some people said that Tomcat session cluster is not fit for high traffic web services. So I did performance test. (both DeltaManager and BackupManager) An ideal cluster is whose total TPS shows linear graph. But Tomcat session cluster showed log graph. (it's coefficient is dependent on usage pattern) I analyzed why it happened. The following …

About Tomcat session cluster

Servlet session on Tomcat is managed by "Tomcat manager". There are 3 kinds of session manager. Default manager (StandardManager) Delta manager Backup manager Default manager (StandardManager) is non clustered session manager. That is, sessions are not shared between Tomcat instances. Without specific setting, default manager is used when we use servlet session api. Delta manager …