AMQ224078 The size of duplicate cache detection WARN message on JBoss EAP 7

Issue

• I'm seeing the following WARN message on a load balancing cluster. What causes this WARN message?

WARN  [org.apache.activemq.artemis.core.server] (Thread-0 (ActiveMQ-client-global-threads)) AMQ224078: The size of duplicate cache detection (<id_cache-size/>) appears to be too large 20,000. It should be no greater than the number of messages that can be squeezed into conformation buffer (<confirmation-window-size/>) 1,048,576.