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From "Mika Goeckel" <m...@stepstone.de>
Subject Re: Tomcat 4.0 JDBC servlet clustering and sharing
Date Thu, 08 Nov 2001 20:47:54 GMT
Kief, Matt,

I started discussion again under the topic " Tomcat 4 Cluster -- plans?"
from a more feature driven perspective. Myself and some other guys I know
would like to contribute as well, but we need some more discussions before
we start, so all: please give us more of your thoughts :-)

Cheers, Mika

----- Original Message -----
From: "Kief Morris" <kmorris@bitbull.com>
To: "Tomcat Developers List" <tomcat-dev@jakarta.apache.org>
Sent: Thursday, November 08, 2001 10:39 AM
Subject: Re: Tomcat 4.0 JDBC servlet clustering and sharing


> Pickering, Matthew D typed the following on 10:55 AM 11/1/2001 -0600
> >My question is this:  Is this functionality still considered experimental
> >and is buggy, or is it simply lacking documentation?
>
> I would call it semi-experimental, in that we haven't really had any
> feedback from people using it "in anger".
>
> >If no one is actively working on the session persistence and clustering
> >side, I am willing to volunteer my services to document and development
them
> >to the same level as other features (such as the Realms support).
>
> It hasn't been actively worked on in a while, although both Bip and I (who
> put in most of what's there) are both still around. It's something I'd
like to
> take some time to flesh out, but I haven't had the time (hell, it's taken
me
> a week to respond to this message). Your contributions would be more
> than welcome, especially since it sounds like you've got some experience
> in the area.
>
> I don't think Clustering uses JDBC at the moment, it's just got a
MultiCast
> based implementation. Some rearchitecting may be in order to allow
different
> schemes for sharing sessions - it should be possible to swap
implementations
> based on MultiCast, JDBC, JavaSpaces, or whatever, as can be done with
> security realms and session persistence.
>
> A few weeks ago there was discussion on a thread related to embedding
> Tomcat in Avalon, which indicated the Cluster architecture could use some

> reworking to bring it into line with the rest of Catalina.
>
> I'd also recommend restructuring the Manager class hierarchy. Craig has
> long suggested that PersistentManager subclass StandardManager, and
> that DistributedManager in turn subclass PersistentManager. I had gone
> for each of these being siblings of MiddleManager, but in retrospect it
seems
> like Craig's scheme makes more sense. The only thing is, I still think
there
> ought to be a lightweight Manager, with no persistence even for
start/stop,
> which might be more suitable for embedding Catalina in some situations.
> But that should be easy enough for someone to implement if they need it.
>
> Finally, I think it'd be a very good thing to come up with some additions
> to tester to allow automated testing of both persistence and distributed
> sessions. This wouldn't be as simple as adding more unit tests, since
> different Manager configurations need to be tried: perhaps an optional
> tester build and script target would handle this, swapping the
configuration
> file and restarting. Tests would include making sure persistence doesn't
> work if disabled (e.g. just duplicate the current restart persistence
test,
> but expecting the session to not be available after restart).
>
> Kief
>
>
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