Restrictions

Maximum number of topics

Depends on the instance specifications. This limit cannot be changed.

When this limit is reached, no more topics can be created.

Maximum number of consumer groups

Depends on the instance specifications. This limit cannot be changed.

When this limit is reached, no more consumer groups can be created.

Message size

The maximum size of a message is 4 MB. The maximum size of a message attribute is 16 KB. The message size cannot be changed.

When this limit is reached, messages will fail to be sent.

Message retention duration

The default retention period is 48 hours, which can be modified to up to 720 hours. Messages will be automatically deleted after the retention period expires.

Consumer offset reset

You can reset the retrieval start position to any time within two days.

Delay of scheduled messages

The maximum delay is one year. This limit cannot be changed.

You can schedule messages to be delivered at any time within one year.

Request-Reply

Not supported.

Configuration parameters

Cannot be modified through open-source APIs.

Broker faults

When some brokers of an instance are faulty, topics, consumer groups, and users cannot be created, modified, or deleted, but can be queried.