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From Gmail User <>
Subject Re: ANN: scalable clustered session manager
Date Thu, 07 Apr 2005 03:48:26 GMT
I hope I did not miss any relevant communication regarding this thead. I
was wondering though if your code could be used for Tomcat 4.1.30 (I am
not quite ready to move my stuff to 5.x).



On Tue, 2005-02-22 at 00:59 -0800, Rob Block wrote:
> Tomcat users,
> I have created a plugin for Tomcat 5 that provides scalable session
> clustering by replicating each session to a single node rather than
> the whole cluster.  For large-cluster deployments (the primary target
> audience of this work), the resource savings for both bandwidth and
> per-node memory usage can be dramatic compared to the current full
> replication scheme.
> The tomcat plugin is hosted at
> (formerly home to the
> full-replication jgroups-based session manager that is now integrated
> into Tomcat 5).  The initial (alpha quality) release of the plugin is
> available to users and developers now and is under active
> development. 
> To download the plugin: go to tomcat-jg site (above) and select
> tomcat-jcluster package under File Releases.  It contains three jar
> files, plus release notes for setting it up:
>  - catalina-ha.jar  the tomcat plugin 
>  - jcluster.jar  jcluster API 
>  - jcluster-plugin.jar  jgroups impl of jcluster 
> The plugin uses the jcluster API ( for
> communication, membership and failover.  Jcluster is a BSD-licensed
> set of APIs that specifies group communication functionality similar
> to jgroups.  Jgroups is currently required as a separate download as
> it is the only jcluster impl.  However, this is only temporary as I
> am working on a port to use Tomcat's internal communication classes. 
> The jcluster javadoc is online at
> The tomcat plugin source is viewable at:
> I would appreciate feedback about the usefulness of this project, in
> particular, how many of you are deploying Tomcat in large cluster
> configurations where current scalability limitations are a concern.
> Please address any questions to me at
> Regards,
> Rob
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