I have two questions about mod_webapp and/or mod_jk. But first a little background:
Most of you know that I'm working on a distributed session management solution the purpose for which is to provide fail-over capability in the context of a load balanced environment. By fail-over, I mean that in a cluster of Tomcat instances that are front-ended by Apache (as a load manager or proxy), any of the tomcat instances could be brought down (or crash) without the user knowing it. This requires that the load-balancing front-end route requests for sessions on the downed Tomcat instance to a different tomcat instance. It also means that all session data that was 'hosted' on the downed tomcat has been stored somewhere else in the cluster and is available to any tomcat instance. The bulk of this work (to manage the distribution of session data) is complete, I'm now in the process of integrating it with the Tomcat 4.x. As an aside, It could also be integrated with Tomcat 3.x should someone desperately require it. I haven't been able to find much information about mod_webapp and how it is supposed to work (for load balancing). I can only assume that it is similar to mod_jk's load balancing behavior. My understanding of this is that Apache will remember which tomcat instance 'created' each JSESSIONID, and route subsequent requests to the tomcat instance that was responsible for creating that session. First question: Are my above assumptions correct? If not, can someone provide a more accurate description of the intended behavior or point me to the place that does? If my assumptions are correct, this means that fail-over cannot occur, since requests are only routed to the tomcat instance that 'created' the given JSESSIONID. Second question: How can I go about getting the necessary connector level changes made that will support re-routing of requests for sessions hosted on a 'downed' tomcat to some other tomcat? This re-routing of requests is critical. Without it fail-over is simply not possible. Regards, Tom Drake President, software/etc inc. Cell: 408-505-6864 Email: [EMAIL PROTECTED] -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
