On Oct 14, 2005, at 10:03 AM, Jeff Genender wrote:
Dave Colasurdo wrote:
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?
Speaking from a Tomcat perspective, I just need to add the
clustering GBeans and it should be available immediately. But this
only addresses the web tier, which is not good enough.
It's great - are you kidding? :)
I think if we approached clustering based on need, primary would be
webtier... we'd get a lot of bang for that buck...
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?
Yep...again...just a Gbean wrapper. I could offer up the code in
literally a few minutes. I held off from doing this before we were
to choose a direction for our clustering solution. If you all
(community) want this as an interim solution, I can activate Tomcat
clustering this weekend. Just say so - I just need to see some
interest.
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.
Its obviously web only. I brought up the Tomcat clustering kind of
a roll-your-own option. We could take what is there and build on
it to work in the other areas.
Also, how does Tangosol Coherence fit in? Is this an application
level clustering solution?
Tangasol would fit in nicely, if it were free ;-) I spoke with
Cameron last week at JIA and flat out asked him about the
possibility of a donation. He didn't say no ;-) He did say he
needed to think about it and how it fits his company's business
model, of which I have complete respect for.
Jeff
Dave
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
--
Jeff Genender
http://geronimo.apache.org
--
Geir Magnusson Jr +1-203-665-6437
[EMAIL PROTECTED]
