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- There are multiple durable topic subscribers (Sub-1, Sub-2, Sub-3 and Sub-4) connecting to the MB cluster using a shared subscription ID (Sub1). Note that the subscribers Sub-B 2 and Sub-C 3 are connecting to the same MB node in the cluster.
There are 3 other clients (Pub-1, Pub-2 and Pub-3) publishing messages to the SportsNews topic.
Info When a client publishes messages to a topic, the client must connect to a particular MB node in the cluster. In the above example, publishers Pub-1, Pub-2 and Pub-3 connects to MB nodes A, B and C respectively. However, since all three nodes belong to a clustered setup, the messages published to each node are received by the slot manager of the cluster and not by the specific node to which the publisher sends the message. The slot manager then allocates all the received messages among the 3 nodes. This means that the messages published to the MB cluster can be dispatched to the subscriber clients from any one of the 3 nodes in the cluster.
All the messages published to the cluster will be evenly distributed among the subscribers, because the subscription is shared. Therefore, the total number of messages that are published to the MB cluster will equal the total number of messages that are received by all the subscribers (x1+x2+x3 = y1+y2+y3+y4).
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