This section describes the concepts related to distributed queuing with
queue-sharing groups. For additional information on the concepts of
shared queues and queue-sharing groups, see WebSphere MQ
for z/OS Concepts and Planning Guide, "Shared queues"
.
Class of service
A shared queue is a type of local queue that offers a different class of service. Messages on a shared queue are stored in a coupling facility (CF), which allows them to be accessed by all queue managers in the queue-sharing group. A message on a shared queue must be a message of length no more than 63KB.
A queue-sharing group has a generic interface that allows the network to view the group as a single entity. This is achieved by having a single generic address that can be used to connect to any queue manager within the group.
Each queue manager in the queue-sharing group listens for inbound session requests on an address that is logically related to the generic address. For more information see Listeners below.