Re: Is it possible to have local and remote interfaces at the same time?

Hi Zoran,
> Hi!
>
> We are using Jonas 4.10.9 and are trying to do clustering. For this purpose we
> changed our code from using local interfaces to remote interfaces. But now of
> course because of remote interfaces every client action is now MUCH slower. We
> still didn't manage to have clustering up and running, but we seriously doubt
> that clustering is going to make it up!
>
> a) Do we have to switch to pure remote interfaces for clustering? Is it
> possible to have both local and remote interface at the same time? (Like
> lookup-methods being smart enough to know if the bean is on local or remote
> machine.)
>   
You can make a try with the local call optimization at the rmi level 
(see carol.jvm.rmi.local.call and local.registry properties in 
carol.properties file)
> b) Are both interfaces at the same time possible
>     1)	in Jonas 4.10.9 ?
>     2)	in Jonas 5 with ejb2 container?
>     3)	in Jonas 5 with ejb3 container?
>   
Yes for all
> c) if clustering goes only with remote interfaces, then what is the benefit of
> it if the single user performance drops significantly due to the fact that we
> are forced to use remote interfaces?
>   

A drop in the performance with a single node in the clustering mode is 
not so weird, a small overhead may lie in the underlying mechanism, 
clustering goals being scalability and availability.

Generally the best architecture for performance is to keep web and ejb 
layers in a same AS node and to perform load-balancing  at the web level 
(Apache/mod_jk). But maybe as such deployment is not appropriate in your 
case ?

Regards;


> Thank you, Zoran F.
>
>
>   


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Benoit Pelletier
http://jonas.ow2.org
Bull, Architect of an Open World TM
http://www.bull.com