RocketMQ Concepts

A topic is a category of messages. It is the basic unit for creating and retrieving messages.

A topic consists of multiple queues. A larger number of queues indicates higher retrieval concurrency.

A producer sends messages to the server.

A consumer obtains messages from the server.

A consumer group contains consumers that have similar retrieval behavior.

Brokers are a cluster of ECSs that process services. A broker consists of one master and two slaves.

A lightweight registry that stores metadata. Before producing or consuming messages, producers and consumers must obtain metadata from a NameServer.

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