[rules-users] BRMS in a WAS cluster

[Vikrant Yagnick]

Hi Seema,

We had initially tried using the BRMS for rules using WAS 6.1 and Oracle in clustered modes.
While, we are not going for the BRMS right now due to license and support issues, from that experience I can answer some of the questions, below.

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Seema Manivannan
Sent: Thursday, November 13, 2008 6:15 AM
To: rules-users at lists.jboss.org
Subject: Re: [rules-users] BRMS in a WAS cluster

hi,

I would appreciate any replies at least confirming that my approach below is right.

Thanks,
Seema
On Sun, Nov 9, 2008 at 11:16 PM, seemamani <seemamani at gmail.com<mailto:seemamani at gmail.com>> wrote:

We use Drools 4.0.7 in our application which is deployed on a WAS 6.1 cluster
and it is working fine. Now we want to deploy the Drools BRMS also in the
WAS cluster. I went through the Drools and Jackrabbit mailing lists and
documentation. Please confirm if my understanding of how this can be
implemented is correct.

1. By default, JackRabbit uses Apache Derby in-memory database which does
not support clustering

That is correct


2. We need to configure a persistence manager in JackRabbit that stores data
in a RDBMS like Oracle


Yes. If you need a sample, I can send it to you. (Though, I am sure there is a lot of material on this on the web).

3. I need to follow the instructions for JackRabbit clustering given here
http://wiki.apache.org/jackrabbit/Clustering

I am not sure, why you need Jack Rabbit clustering. If the tables are stored in the database, then I am assuming RAC should handle clustering at the DB level.  Though, do correct me if I am wrong.


4.  Also, the Drools documentation says that "The BRMS will create the
tables the first time it is started up if it is running against a fresh
(empty) RDBMS - so its important to note that the user credentials supplied
have permissions to create tables (at least initially, on first run, after
that they could be locked down)."
Is it not possible to create the Oracle tables before running the BRMS (we
have permission issues in creating the tables from the application)? I
assume that the DDL for creating the tables is available with the JackRabbit
distribution.

One Q&D way may be to just create the tables in a test database and then make the schema into DDL scripts for use before installation.


5. Is there anything else I'm missing? Will BRMS work fine in the cluster
with the above setup?

My assumption is that the BRMS is just a web-app using the database as it's back-end and hence do not know of any issues it could face.

Thanks,
Seema
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