Round robin load balancing with 15 threads-MDBs on several AS

[nicolas.laporte]

Hi all,

We have an issue with the load balancing in the following environement:

- 1 stand-alone non-clustered HornetQ 2.1.2.Final

- several AS with MDBs configured with 15 threads

The load is not balanced on the different AS until the 15 threads of 1 MDB are not used.

When we configure the MDBs with 1 thread, the load balancing is well done on all AS.

FYI, we use a discovery group in hornetq-ra.rar/META-INF/ra.xml. The AS are JBoss 4.2.3.GA.

Is it a known bug? Is it the expected behavior? Is there configuration solutions?

Thanks for your help,

Regards.

[jbertram]

My guess is that a few of the JMS sessions used by your MDB on one of the nodes are sucking up all the messages before the others have a chance to get any.  See this for an explanation of how to modify the client buffering on the server-side.  You can also do the same thing from the MDB-side by using the consumerWindowSize activation configuration property.

[nicolas.laporte]

Hi Justin,

thank you very much for this prompt reply.

We tried the setting consumer-window-size=0 but the behavior does not change.

1 AS consumes 15 messages, then another one consumes 15 messages, and so on... (ok for peaks of activity but poor laod balancing during normal activity).

Maybe I did not understand the meaning of the consumer-window-size setting.I though that the no-buffering would be what we need.

Any other ideas are welcome!

Thanks again.

Nicolas.