Cluster topics

Cluster topics are administrative topics with the cluster attribute defined. Information about cluster topics is pushed to all members of a cluster, and combined with local topics to create portions of a topic space that spans multiple queue managers. This enables messages published on a topic on one queue manager to be delivered to subscriptions of other queue managers in the cluster.

When you define a cluster topic on a queue manager, the cluster topic definition is sent to the full repository queue managers. The full repositories then propagate the cluster topic definition to all queue managers within the cluster, making the same cluster topic available to publishers and subscribers at any queue manager in the cluster. The queue manager on which you create a cluster topic is known as a cluster topic host. The cluster topic can be used by any queue manager in the cluster, but any modifications to a cluster topic must be made on the queue manager where that topic is defined (the host) at which point the modification is propagated to all members of the cluster through the full repositories.

For information about configuring cluster topics to use direct routing or topic host routing, and about clustered topic inheritance and wildcard subscriptions, see Defining cluster topics.

For information about the commands to use to display cluster topics, see the related information.

Related information

• Work with administrative topics
• Work with subscriptions
• DISPLAY TOPIC
• DISPLAY TPSTATUS
• DISPLAY SUB