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From "Mike Curwen" <>
Subject RE: Clustering / Load Balancer / Session Cookie
Date Thu, 29 Apr 2004 14:16:56 GMT
Maybe my brain hasn't kicked in yet, but there's something I'm not
getting about this conversation...  ;)   More inline...

> -----Original Message-----
> From: Shapira, Yoav [] 
> Sent: Thursday, April 29, 2004 8:57 AM
> To: Tomcat Users List
> Subject: RE: Clustering / Load Balancer / Session Cookie
> Hi,
> >So the supplied tomcat load balancer isnt of any use for stateful
> sessions
> >where the cluster is spread accross several machines?
> It's of use for stateless sessions mostly, yes.  

Am I wrong in thinking that "stateless session" is an oxymoronic
expression?  A session is all about maintaining state. (yes, I never did
quite grok stateful/stateless session EJB's).

> Furthermore, you are guaranteed (unless you screw up 
> your own rules somehow) that it will keep forwarding a 
> request for a given URL to the same host every time, which 
> means you can do some session stuff.  

So the balancer app does "sticky sessions".  Awesome.  You can do *all*
session stuff then, can't you?

> But I haven't thought 
> through the next step, support for stateful session 
> replication, yet, and don't have bandwidth at the moment to 
> do so. 

Doesn't filip's clustering code accomplish this? (Why would the balancer
have to do it?)

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