Glossary

The specific terms used in message queueing services are defined as follows:

Name	Definitions
topic	A topic can be interpreted as an actual queue. A certain cache space is set for each topic, and there are completely isolated data between different topics.
Instance	Services and charging are based on entities that can provide independent services under a user account. You can have multiple topics in one instance.
sub (subscription)	Sub can be interpreted as an actual broker which sends data consumed to client. Multiple brokers are supported by a queue, which are mutually independent and can consume messages from the queue in different modes.
Message	An independent datagram queued is called a message.
Message production	An act of sending messages to queue
Producer	An object that sends messages to a queue
Consumption	An act of retrieving messages from queue
Consumer	An object that reads messages from queue
Message ID	A unique number assigned to queued messages, which actually represents the first byte offset of message data in the queue
Consumer position	The first byte offset of data in the next message read by the consumer from the queue
Cache usage for messages	The number of messages calculated by the server per unit of 1k, based on the data traffic produced/consumed by the queue
Clustering	Sub clients who subscribe to the same topic are considered to be in a cluster group, and the server will send messages to every client in the cluster on average.

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