Re: How to do Downtime with a Apache/Tomcat webapp

2005-05-17 Thread Gmail User 
I believe this link has the info you are looking for. It discusses
displaying error messages by Apache when the app server is down.

http://wiki.apache.org/cocoon/ApacheModProxy


Ed

On Mon, 2005-05-16 at 11:33 -0400, Len Popp wrote:
 I've been thinking about the same problem, but I haven't gotten around to 
 working on it seriously.
  How about this: Instead of fiddling with the JkMount directives in Apache, 
 swap the web.xml in your Tomcat app so it points to a minimal servlet that 
 returns the Out of service page for all requests.
  Does that sound like it would work? It would be less disruptive because you 
 don't have to restart Apache (if there's more to the web site than the one 
 Tomcat app). Plus this will work with stand-alone Tomcat.


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Re: ANN: scalable clustered session manager

2005-04-06 Thread Gmail User 
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).

Thanks,

Ed

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
 https://sourceforge.net/projects/tomcat-jg (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 (http://jcluster.dev.java.net) 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
 https://jcluster.dev.java.net/nonav/javadoc/index.html.
 
 The tomcat plugin source is viewable at:
 http://cvs.sourceforge.net/viewcvs.py/tomcat-jg/tomcat-javagroups/src/org/apache/catalina/cluster/session/
 
 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 [EMAIL PROTECTED]
 
 Regards,
 Rob
 
 
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