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From Juergen Weber <>
Subject Re: State of EJB Clustering
Date Thu, 16 Jul 2009 09:31:06 GMT

David, thanks for your help.

Digging deeper I found this posting which is explaining things:
David Blevins Re: Client/Server Multicast Discovery and Failover

I think documentation could be based on this posting, missing is how to set
up the servers.

Looks like clustering needs multicast so I guess I have to persuade sysadms
to set up multicast ...


djencks wrote:
> Hi Juergen,
> GCache never got finished.
> The wadi clustering works but is for stateful beans and AFAIK it  
> provides only the state replication between cluster members and not  
> the client that supports failover.  I hope Gianny will tell me if I'm  
> wrong about this :-)
> We do have the kind of clustering you want but I'm not sure if its  
> documented.  Basically the server cluster members maintain cluster  
> membership information using multicast hearbeats and the ejb client  
> maintains a list of servers and can change target server based on  
> availability.
> There is an example of this at sandbox/failover and it used to work,  
> but AFAIK no one has tried running it for several months.
> This would be a great thing to turn into a sample and make more public  
> and documented for 2.2.
> thanks
> david jencks
> On Jul 15, 2009, at 8:34 AM, Juergen Weber wrote:
>> Hi,
>> what is the state of Geronimo's EJB clustering?
>> Basically I wonder if it is possible to have n Java application  
>> clients that
>> address m servers that run stateless beans. A client should stick to a
>> server as long it is alive and transparently go to another one if it  
>> is
>> dead.
>> Is this information here still current for 2.2?
>> clustering.html
>> Or would GGache be the way to go?
>> Thanks,
>> Juergen
>> -- 
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