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The slot manager communicates with both publishers and subscribers and acts as the coordinator for distributing slots among the nodes. A slot assignment map is maintained to track the slots that are assigned to nodes at a given time. The activities of a slot manager can be illustrated as follows.
Communicating with publishers
Each publisher belongs to a queue/topic and its messages are published in the row of the message store mapped to this queue. A publisher returns its last message ID to the slot manager node in the MB cluster after every 1000 messages or after a timeout. The slot manager updates the Hazelcast Distributed Map with these IDs and uses them to generate slots when it receives requests for slots from slot delivery worker nodes.
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