By default, a receiver requests the next message from the server in response to each fetch call, resulting in messages being sent to the receiver one at a time. As in the case of sending, it is often desirable to avoid this roundtrip for each message. This can be achieved by allowing the receiver to prefetch messages in anticipation of fetch calls being made. The receiver needs to be able to store these prefetched messages, the number it can hold is controlled by the receivers capacity.
Apache Qpid, Messaging built on AMQP; Copyright © 2013 The Apache Software Foundation; Licensed under the Apache License, Version 2.0; Apache Qpid, Qpid, Qpid Proton, Proton, Apache, the Apache feather logo, and the Apache Qpid project logo are trademarks of The Apache Software Foundation; All other marks mentioned may be trademarks or registered trademarks of their respective owners