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From Dave Colasurdo <>
Subject Re: Clustering
Date Fri, 14 Oct 2005 13:01:14 GMT
Can we level-set the conversation (in this subthread) by describing the 
current clustering options available in Geronimo.  It seems that Tomcat 
and Jetty already have some level of web tier clustering.  Can a 
geronimo user easily leverage this support?

Specifically, Tomcat supports Load Balancing via JK 
connector/mod_proxy/balancer, HttpSession failover via 
file/database/memory replication, sticky session, etc..
Though it seems that some of the configuration/management depends on 
tomcat server.xml..  Can geronimo users currently easily leverage this 
web tier clustering?

I understand that Tomcat and Jetty provide only Web tier solutions and 
don't address EJB, JNDI, JDBC, JMS..  Though just wondering whether how 
relevant their web tier solutions are to geronimo.

Also, how does Tangosol Coherence fit in?  Is this an application level 
clustering solution?


Jeff Genender wrote:
> Now that we have achieved the covetted J2EE Certification, we need to 
> start thinking about some of the things we will need to have in Geronimo 
> in order to be mass adopted by the Enterprise.
> IMHO, I think one of the huge holes is clustering.  This is a heavy need 
> by many companies and I believe that until we get a powerful clustering 
> solution into G, it will not be taken as a serious J2EE contender.
> So, with that said, I wanted to start a discussion thread on clustering 
> and what we need to do to get this into Geronimo.  I personally would 
> like to be involved in this (thus the reason for me starting this 
> thread) - yeah, since Tomcat is done, now I am bored ;-).
> I was going over the lists and emails and had some great discussion with 
> Jules on the WADI project he has built.  This seems compelling to me.  I 
> also noticed Active Cluster as a possibility.
> So lets start from the top.  Do we use an already available clusering 
> engine or do we roll our own?  Here is a small list of choices I have 
> reviewed and it is by no means complete...
> 1) WADI
> 2) Active Cluster
> 3) Leverage the Tomcat Clustering engine
> So here are some of my questions...
> How complete is WADI and Active Cluster?  Both look interesting to me. 
> My only concern with Active Cluster is it seems to be JMS based, which I 
> think may be slow for high performance clustering (am I incorrect on 
> this?).  How mature is WADI?
> Thoughts and opinions are welcomed.
> Jeff

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