On May 12, 2011, at 6:59 AM, Christian Koppen wrote:
> Dear OpenEJB users,
>
> I'm trying to setup an OpenEJB (3.1.4) cluster of several nodes that host a
> single application with a single stateless session bean.
>
> I successfully configured the client to change the server node in case of a
> node failure using the URL
>
> failover:round-robin:ejbd://localhost:10010,ejbd://localhost:10020
>
>
> Now what I actually want is that the client also changes the server node when
> everything is OK - a simple form of load balancing. I thought this should be
> the normal behavior, but I found out that once a client got a response from a
> certain server, the client will not look for other servers ('sticky'
> behavior).
>
> I read the failover documentation [1] but didn't find anything useful. I also
> found that using a EJB property 'openejb.client.connection.strategy' might
> help [2]
I'll try and update that doc.
Meanwhile, try it as a System property on the client side before you open any
connections.
You can also set it on the server side via an openejb-jar.xml in either of the
properties buckets:
<openejb-jar>
<properties>
openejb.client.connection.strategy=random
</properties>
<ejb-deployment ejb-name="CalculatorImpl">
<properties>
openejb.client.connection.strategy=round-robin
</properties>
</ejb-deployment>
</openejb-jar>
In this case the properties are actually sent up to the client from the server
and work in favor of any system level property.
So order of preference is:
1. bean property (openejb-jar.xml)
2. module property (openejb-jar.xml)
3. system property (client side system property)
-David
> , but I don't know where to set this property. Finally, I found that I could
> implement a custom ConnectionStrategy [3] (which I don't really want to), but
> didn't get this to work either.
>
> I suppose that what I'm looking for is configuration on the client, not on
> the server.
>
> Can someone help out?
>
> Thanks in advance,
> Christian
>
>
> [1] http://openejb.apache.org/3.0/failover.html
> [2]
> http://mail-archives.apache.org/mod_mbox/openejb-dev/201005.mbox/%[email protected]%3E
> [3] https://issues.apache.org/jira/browse/OPENEJB-904
