possibly resolve https://issues.apache.org/activemq/browse/AMQ-2564 - add test and fix issue with slave replication effecting response correlator when message is queued waiting for space, the id can get out of sync, causing a missed reply to the orignal producer, which would result in a hang
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/ft/MasterBroker.java