Cluster-aware web application with cocoon

[Rui Alberto <ru...@ptinovacao.pt>]

Hi all,

I'm about to start developing a web application using
Cocoon. The web application should be able to run in
a cluster with load-balancing and failover. I think
that having load-balancing is not a problem, since
each cliente will always be served by the same instance, unless
that instance crashes. If the instance crashes, another
server should take over without affecting the client
session. HTTP sessions will be replicated.

The question is: What should I take into consideration
when developing an application with apache cocoon that
should be able to run in a cluster with failover?
What about continuations?

Does anyone know where can I find a document about this
subject, or give me some feedback about this subject?

Thank you all for any help,

Rui



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Re: Cluster-aware web application with cocoon

[Reinhard Poetz <re...@apache.org>]

Rui Alberto wrote:
> Hi all,
> 
> I'm about to start developing a web application using
> Cocoon. The web application should be able to run in
> a cluster with load-balancing and failover. I think
> that having load-balancing is not a problem, since
> each cliente will always be served by the same instance, unless
> that instance crashes. If the instance crashes, another
> server should take over without affecting the client
> session. HTTP sessions will be replicated.
> 
> The question is: What should I take into consideration
> when developing an application with apache cocoon that
> should be able to run in a cluster with failover?
> What about continuations?

Unfortunatly Flowscript 
(http://issues.apache.org/bugzilla/show_bug.cgi?id=33324) is a showstopper for 
session replication ATM. I worked a few month ago on this and looked at it last 
weekend again. There is some work to do but IMO it is feasable. Don't expect too 
much soon as my schedule is very tight. Keep an eye on the bugzilla entry as I 
will keep it updated.

Torsten is also working on the Javaflow part as Javaflow applications can't be 
replicated either, but it hasn't been finished yet 
either(http://vafer.org/blog/tcurdt/archives/000179.html)

HTH a bit

-- 
Reinhard Pötz           Independent Consultant, Trainer & (IT)-Coach 

{Software Engineering, Open Source, Web Applications, Apache Cocoon}

                                        web(log): http://www.poetz.cc
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