Messages are delivered to JMS Clients Non uniformly - Jboss

[suresh.thomas]

We have a Jboss server which hosts a JMS queue, which is being subscribed by message driven beans on 2 other Jboss nodes (3.2.3 with JMS 1.1). Theoretically the messages should be randomly delivered to both of these subscribing server nodes (1:1 ratio). But what we are seeing is most of the messages (approximately 1:3 ratio) are being delivered to one of the nodes (looks like the node which registered to the JMS queue first)

The maximum number of MDBs configured on each of the receiving nodes where 15 (default with 3.2.3), we have brought down them to 5 , still the behaviour be the same.If we restart the node, which is loaded more, the behaviour just gets swapped.

We are not able to understand why this affinity is?, This is causing extreme CPU utilisation on one of the nodes

Any comments - highly appreciated.

[azhurakousky]

I am not sure if I understand your problem correctly, but if you want to spread your load equaly to all the MDBs, you may want to change the default load balancing policy to RoundRobin. The following WIKI explains how to do it. We had similar problem with one of our clients and it works great.

http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossMQReceiverImpl

Regards
Oleg Zhurakousky

[suresh.thomas]

Thanks

Did you implement your own list based algorithm for this ?

Any code sample please

[genman]

You can write your own code; but JBoss provides a couple of implementations you can use.