There is another option.
You can get a hardware load balancer that is 'session aware'. Meaning it
directs requests belonging to a session to the same web-server. Check out
Cisco GlobalDirector and F5 3DNS or software solutions from Resonate. (There
are still others.)
So there are 3 levels on which you can do it.
1. DNS level (harware/software)
2. Web server (Apache) OR Application Server (Websphere)
3. Your own load balancing servlet
dave.
"Andres G. Portillo D." wrote:
> Hi everybody
>
> I have an application that uses servlets as fronted, and one of its
> main requirements is to be highly scalable, so I want to be able to
> split
> my app servlets between several web servers. My app uses the Session API
> to keep track of the user events, so I need to have a way that if a user
> first hits in a webserver and then in another webserver the servlet in
> the new webserver can access the session info of the first one.
>
> As long as I can think of I see the next two ways to handle this:
>
> a) Get (Buy or Program) a web balancer device that is smart enough
> to get some session info from every request, so it can redirect all the
> request from a user to the same webserver. Do you know of some similar
> device?
>
> b) Have a servlet engine that has support to share session across
> several webservers, this could be implemented through a shared database.
> I would prefer just to buy a product like this, but if not I'd suppose
> I'll to program it.
>
> Is there any other choice that I'm missing?
>
> Thanks in advance for your time.
>
> bye
>
> andres
>
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