4.7. Message Groups

Message Groups allow a sender to indicate that a group of messages should all be handled by the same consumer. The sender sets the header of messages to identify them as part of the same group, then sends the messages to a queue that has message grouping enabled.

The broker ensures that a single consumer gets exclusive access to the messages in a group, and that the messages in a group are delivered and re-delivered in the order they were received.

Note that Message Grouping cannot be used in conjunction with Last Value Queue or Priority Queuing.

The implementation of Message Groups is described in a specification attached to its feature request: QPID-3346: Support message grouping with strict sequence consumption across multiple consumers.