Hi,
Does anyone have any experience clustering Orion EJB servers
successfully in a production (or even development) environment? I've tried
clustering a web application and it generally seems OK. However, in order to
eliminate single points of failure in deployment, I assume that I would have
to cluster the EJBs as well. To do that, I've tried running multiple copies
of Orion on separate machines, all of them accessing a common set of ejb
class files, jsp files, etc from a shared location as well as a common
datasource with exclusive-write-access="false" in the orion-ejb-jar.xml
files.
My deployment environment is
Windows NT
Orion 1.3.8/ 1.4.0
JDK 1.3
Interbase 6.0/ Sybase System 11
There are some problems:
1. When using 1.3.8, Orion has problems deploying entity beans. However I
believe the problem has been solved in 1.4.0
2. When I tried 1.4.0, I had some problems arising from the Orion OR-mapping
scheme. Details can be found in bug #158 in Orion Bugzilla.
3. Also in 1.4.0, there are problems creating entity beans when I try to use
UserTransaction in my EJB clients. The entity beans seem to have been
partially created (they exist when i check though orion console but some
attributes have not been initialized) but do not exist in the database.
The problems do not exist when I only run one copy of Orion with
exclusive-write-access="true". But I can't possibly run a cluster of Orion
app servers with that setting, can I?
Any info is greatly appreciated, thanks.
Regards,
Julian
