Message distribution for MDBs consumer deployed on 2 nodes in cluster

We have two Jboss 6.4.4 EAP nodes (with hornetq) in cluster.
Many (~30) MDB subscribers (deployed on both nodes ) are subscribed to one topic and currently messages sent to that topic are consumed by MDB on both nodes.
What we have to do (configuration , source code sample) if we want to achieve behavior where only one of those MDBs would receive any particular message sent to that topic.