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From Aaron Mulder <>
Subject Re: geronimo-web.xml, container-config, container-specific namespaces
Date Thu, 05 Jan 2006 14:39:05 GMT
In my personal experience, any machine in a cluster is fully in a
cluster -- I haven't seen something like 10 machines running 1
clustered app and then each running something else on the side.

However, it is kind of nice in WebLogic that you can deploy to either
a cluster or a single machine.  I would lean toward that kind of
approach.  You set up clustering at the server level, and then each
application can either be deployed to individual servers or to the
cluster, but if you don't set up clustering at the server level,
there's no cluster to deploy to and you have to deploy to individual
servers.   (There's plumbing in our deployer so it could support that
kind of approach.)


On 1/5/06, Jeff Genender <> wrote:
> Greg Wilkins wrote:
> > Aaron Mulder wrote:
> >> Well...  is it possible to make this not specific to WADI?  Perhaps
> >> make it a generic "clustering manager" tag, and is "just so happens"
> >> that the only classes we let you configure so far are the WADI ones?
> >> Ideally, we'd put some generic interface in the Geronimo space, and
> >> then the WADI ones would implement or extend that, so if we ever
> >> wanted to integrate other clustering options we'd leave that door
> >> open.
> >
> > +1
> >
> > I really think that clustering contents of geronimo-web.xml needs to
> > be moved out of the webapplication.  Clustering should be configured once
> > and only once for the whole server - not within each web application (also
> > we have to consider EJB clustering which does not have a webapp).
> I don't agree on this point.  You should be able to specify certain web
> apps that need clustering and others that do not.  IMHO, you should be
> able to cluster the components that you want, and not turn it on for the
> entire server.  The Tomcat clustering works this way today.  I can turn
> on clustering at the Engine, host, or context level.
> >
> > So I really see that we need a new module called "cluster" (or "wadi" if
> > we want to persist with the implementation exposure we have with
> > jetty and tomcat).
> >
> > If the only web container specific part of the configuration is to
> > choose the class type of the session manager, then I think that this could
> > almost be hard coded in the jetty and tomcat modules - when they see
> > a distributable tag, they look for a cluster/wadi gbean and instantiate
> > a specific session manager that is required to work with it.
> >
> > If there is other web app specific configuration, then it can be
> > left in a geronimo-web.xml, but hopefully as a non container specific
> > nature.
> >
> > cheers
> >
> >
> >

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