Creating the Topic
Last updated:2026-01-23 17:34:03
Scenarios
Topic is a core concept in TDMQ for RocketMQ. Typically, topics are used for centralized classification and management of various types of messages produced by the system. For example, messages related to transactions can be stored in a topic named trade for other consumers to subscribe to.
In actual application scenarios, a topic often represents a business aggregation, and developers determine how to design different topics based on their system design and data architecture design.
Constraints and Limitations
When the total number of topics (including manually and automatically created topics) under a cluster reaches the upper limit, you cannot create topics. You can purchase an additional topic quantity to increase the topic quota. For specific steps, see Adjusting Cluster Specifications.
Operation Steps
1. Log in to the TDMQ for RocketMQ console.
2. In the left sidebar, select Topic. Select the region and cluster and click Create to go to the Create Topic page.
3. In the Create Topic dialog box, specify the following information.
Parameter | Required | Description |
Topic Name | Yes | Enter the topic name, which cannot be modified after creation. The name must be 3 to 100 characters in length and can contain only letters, digits, percent signs (%), hyphens (-), and underscores (_). |
Type | Yes | Select a message type. Messages are classified into normal messages, ordered messages, delayed messages, and transactional messages. (For details about message types, see Message Types). Topics of different types of messages cannot be used interchangeably. For example, a topic created for normal messages cannot be used to send or receive other types of messages. |
Tag | No | Tags are used to categorize and manage topic resources. You can also grant sub-accounts read/write permissions for specific resource types through authorization by tag. For details, see Configuring Resource Tags and Granting Tag-Level Permissions to Sub-accounts. |
Queue Quantity | Yes | Select the number of queues. Up to 16 queues are supported. Multiple queues can improve the production and consumption performance of a single topic. However, message sequentiality cannot be guaranteed in non-ordered message scenarios. |
Message Retention Period | Yes | Retention time for persisted messages, after which messages are deleted regardless of whether they are consumed. Only 5.x clusters of the Pro and Platinum editions support adjusting the message retention time at the topic level, and 5.x clusters of the Trial and Basic editions and 4.x clusters support adjustment at the cluster level. |
Topic Description | No | Enter the topic description, with a string of up to 128 characters. |
4. Click Submit to complete the creation.
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