If you're working with standalone containers, I have no idea.
If you're working with containers behind web servers, here's what I know:
In the JServ days there was, with mod_jserv, a way to do a
"GRACEFUL_SHUTDOWN" (or something like that) of a particular container to
which mod_jserv was sending requests. This would stop sending any new
sessions to that container, but would continue to send already-established
sessions there. This would give you the functionality you're looking for.
I know very little about using mod_jserv with Tomcat (as opposed to with
JServ) -- it's possible that this combination would give you what you want.
This particular feature is *not* supported by the load balancing system in
mod_jk, which is the current plugin of choice for the 3.x branch. It is a
highly-requested feature, however, and there's been some discussion of it
here lately. It's not impossible that it will get implemented within the
next month or two.
-Dan
William Flanders wrote:
>
> Is there a system on the servlet container level which would, after
> a publish, redirect *new* users to a separate servlet container, but
> keep old users on the old servlet container?
>
> Bill
>
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