One more comment. I've been involved in a few business rules projects and have seen solution #2 almost every time. The only time I saw #1 was when there were dependencies between transactions, so they had to process sequentially. Barry -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Knapp, Barry Sent: Tuesday, October 06, 2009 8:25 AM To: Rules Users List Subject: Re: [rules-users] Drools Flow, threads and persistence in a clustered environment Well if this is up for a "dig" type vote, I'd have to up-vote #2. 1) You've got these three nodes assumedly all running on the same hardware, might as well utilize it all. If one node goes down it's not a major crisis or an experiment in "let's get the ksession running on the other node" to start processing again. 2) #2 also makes your application deployment and rule deployment strategy simpler since you will not need to worry about different apps in the cluster having different configurations. Barry -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Alexandros Karypidis Sent: Monday, October 05, 2009 5:02 PM To: 'Rules Users List' Subject: [rules-users] Drools Flow, threads and persistence in a clustered environment Hello, We plan to use Drools (Flow) in our application for managing long-running processes. High-availability is important to us and therefore we target a clustered JBoss environment with 3 nodes. We are looking for advice on how to approach this from a Drools perspective. Can anybody share their experiences on running Drools in a cluster? The following scenarios come to mind: 1) A "singleton" ksession runs constantly on one of the nodes and does all the work; it migrates when the node goes down to another machine. 2) Multiple "ksession" instances on different nodes (for distributing load); when one fails the other picks up its processes by having a second "ksession" instance created on it and resuming execution. Are there any wrapper/utility libraries for Drools that help in clustered environments? Thank you _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.