Re: loadbalancing & failover of stateless beans
Hi, Indeed, the use of ejb over HTTP with a web load balancer is a very attractive alternative. Thank you for this advice. CDT.
Re: loadbalancing & failover of stateless beans
Youcef, I'd like to reiterate one of David's points. If you already have a web load balancer in production, you can get load balancing today for free by simply using our ejb over http protocol. This has a big advantage for your operations staff as they would only have one load balancing system to maintain. Also, it works today :) Regardless, we definitely need load balancing for the standalone protocol. -dain On Jun 4, 2008, at 12:03 AM, David Blevins wrote: On Jun 3, 2008, at 10:36 PM, Youcef HILEM wrote: Hi David, I confirm that my request relates only to stateless beans and not to stateful beans. Most of our business services are available for both Web and Swing applications. The management of state is supported by these applications. We do not use statefull beans. Sounds like a fantastic application for Tomcat + OpenEJB and Collapsed EARs. For loadbalancing, I think it is enough for us to add a class similar to org.apache.openejb.client.StickToLastServerConnectionFactoryStrategy (like RandomServerConnectionFactoryStrategy or StickToNextServerConnectionFactoryStrategy) and change the method getConnectionFactoryStrategy() of class org.apache.openejb.client.ServerMetaData. I take this opportunity to ask whether it is possible to extend the method getInitialContext(Hashtable environment) of class org.apache.openejb.client.JNDIContext to deal with a list of URLs (for key Context.PROVIDER_URL). That's definitely one of the options I had in mind :) If that kind of approach would work for you, we could plum that in and additionally add a way for you to specify the ConnectionFactoryStrategy via an additional InitialContext param or similar. If that works for you, can you add a JIRA for it? Thanks for the request! -David
Re: loadbalancing & failover of stateless beans
Thanks for your responses. I created a Jira : https://issues.apache.org/jira/browse/OPENEJB-816
Re: loadbalancing & failover of stateless beans
On Jun 3, 2008, at 10:36 PM, Youcef HILEM wrote: Hi David, I confirm that my request relates only to stateless beans and not to stateful beans. Most of our business services are available for both Web and Swing applications. The management of state is supported by these applications. We do not use statefull beans. Sounds like a fantastic application for Tomcat + OpenEJB and Collapsed EARs. For loadbalancing, I think it is enough for us to add a class similar to org.apache.openejb.client.StickToLastServerConnectionFactoryStrategy (like RandomServerConnectionFactoryStrategy or StickToNextServerConnectionFactoryStrategy) and change the method getConnectionFactoryStrategy() of class org.apache.openejb.client.ServerMetaData. I take this opportunity to ask whether it is possible to extend the method getInitialContext(Hashtable environment) of class org.apache.openejb.client.JNDIContext to deal with a list of URLs (for key Context.PROVIDER_URL). That's definitely one of the options I had in mind :) If that kind of approach would work for you, we could plum that in and additionally add a way for you to specify the ConnectionFactoryStrategy via an additional InitialContext param or similar. If that works for you, can you add a JIRA for it? Thanks for the request! -David
Re: loadbalancing & failover of stateless beans
Hi David, I confirm that my request relates only to stateless beans and not to stateful beans. Most of our business services are available for both Web and Swing applications. The management of state is supported by these applications. We do not use statefull beans. For loadbalancing, I think it is enough for us to add a class similar to org.apache.openejb.client.StickToLastServerConnectionFactoryStrategy (like RandomServerConnectionFactoryStrategy or StickToNextServerConnectionFactoryStrategy) and change the method getConnectionFactoryStrategy() of class org.apache.openejb.client.ServerMetaData. I take this opportunity to ask whether it is possible to extend the method getInitialContext(Hashtable environment) of class org.apache.openejb.client.JNDIContext to deal with a list of URLs (for key Context.PROVIDER_URL).
Re: loadbalancing & failover of stateless beans
On Jun 3, 2008, at 3:02 AM, [EMAIL PROTECTED] wrote: Hi, Can we expect an implementation in the next delivery. It is an essential feature for us. Hi Youcef, Are you sure you mean failover for stateless beans and not stateful? Getting failover for stateless is pretty trivial and we have a little bit of client logic in that area. Essentially the client code is already capable of rolling over to other servers just there's no real way to *configure* the list of available servers. We can easily add something in this regard. Loadbalancing might be more difficult. If you have an http load balancer, we could likely fix up the ejbd over http protocol to support it which would be the most robust option. If you can describe your desired topology would be a great start. -David
