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From "Geir Magnusson Jr." <ge...@apache.org>
Subject Re: Clustering
Date Fri, 14 Oct 2005 15:41:39 GMT

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
geirm@apache.org



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