Tim wrote : If the buffer becomes full, because the consumer consumption rate cannot keep up with the rate the server is sending, then the client side consumer sends a flow rate change message to the server with an argument of zero. What happens in the case the client buffer becomes full AND there are in-flight messages still arriving? The client may send its "slow down" asynchronous message back to the server, and after a while, the server may react to it, but what happens with the messages that have been sent during this interval? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996142#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...