> hi lachezar,
Hya.
Looking at the text I think you misunderstood me.
I was not looking for a fail-over or Web clustering solution. That's it.
I need to use Orion as a EJB server, not the fulll J2EE App server.
I have some QUITE heavy beans, and just very small web-interface for more
or less a couple of users. I don't have a
super-duper-overloaded-with-connections site. Instead I have time-consuming
stateless session beans, that take up to a 100% CPU time, and work for some
couple of hours.
So what I need is NOT a WEB-Failover solution, but rather a RMI
(EJB-to-EJB) clustering in order to put my heavy-handed EJBs allover my
intranet.
Hope I clarified this.
BTW. I forgot to mention something:
LINUX ISSUE! (tested on RH7/JDK1.3.1)
Define a default route in the routing table.
Otherwise setting the multicast cluster fails with an exception.
This might be as well mentioned on OrionSupport or OrionServer.
THIS IS A JVM ISSUE. NOT ORION SPECIFIC!
Lachezar Dobrev
Software developer
LSN Software and Telecommunication services
Sofia, Bulgaria
> i've got clustering working for our app but haven't used the rmi.xml
> clustering settings. the app seems to failover ok to another machine in
the
> cluster if i switch a machine off, etc,.
>
> we use only stateless session beans and so i wondered if only entity bean
> information was exchanged over the port specified in rmi.xml
>
> what's all this stuff for in rmi.xml
>
> <cluster host="230.0.0.1" id="123" password="123abc" port="9127"
> username="cluster-user" />
> Tag that is defined if the application is to be clustered. Used to set up
a
> local multicast cluster. A username and password used for the servers to
> intercommunicate also needs to be specified.
>
> host - The multicast host/ip to transmit and receive cluster data on. The
> default is 230.0.0.1.
> id - The id (number) of this cluster node to identify itself with in the
> cluster. The default is based on local machine IP.
> password - The password configured for cluster access. Needs to match that
> of the other nodes in the cluster.
> port - The port to transmit and receive cluster data on. The default is
> 9127.
> username - The username configured for cluster access. Needs to match that
> of the other nodes in the cluster.
>
> thanks,
> greg.
>
>
> ----- Original Message -----
> From: Lachezar Dobrev
> To: Orion-Interest
> Sent: Friday, June 15, 2001 6:18 PM
> Subject: RMI Clustering done. Now want more.
>
>
> Hello.
> OK. I was able to (at last) run the RMI clustering. It now works.
But...
> I have a question...
> Now I can put up a cluster, and when a bean does not exist on the
server
> it is searched on the cluster and used. However if it is deployed on more
> than one machine... It is not found on all of them, but rather on only
one.
>
> For simplicity let's assume we have OrionA, OrionB, OrionC and OrionD.
> a) on all machines we have EnterpriseBean1 deployed. It accesses
> EnterpriseBean2
> b) machine OrionA does not have EnterpriseBean2 deployed.
> c) machines OrionB, OrionC and OrionD have EnterpriseBean2 deployed.
> d) all machines have a RMI cluster set-up and working.
> (BTW) Because I needed quite some time to understand why the
> cluster was not working I am eager to help anyone, that needs
> help on the subject.
>
> If machine OrionA runs EnterpriseBean1 it will have to look-up
> EnterpriseBean2, which is used by EnterpriseBean1.
> There is no problem to find that bean (it exists on the cluster).
> However... Once EnterpriseBean2 is used on OrionC it keeps using that one.
> Why? Also. If we deploy EnterpriseBean2 on OrionA it is always found there
> and not on ANY other cluster machine.
>
> 1. How does Orion know on which machine to use the bean? The last one,
> that wakes up?
> 2. Is there a way to implement (at least) a round-robin technique to
> access the clustered bean on more than one server? I mean... When I
look-up
> EnterpriseBean2... I would like to have a different server answering every
> time. Round-robin is sufficient, even though a loadbalancing technique
would
> be better appropriate.
>
> Ok. Waiting forward to hearing from you all...
>
> P.S. Another question... CAN I TURN WEB-SERVICES OFF??? I tried
removing
> the default-web-app tag in the server.xml, but it starts complaining about
> no default web-app :((( I want to have some Orion servers to act as EJB
only
> servers.
>
> Lachezar
>
>
