CreateTopic - ApsaraMQ for RocketMQ - Alibaba Cloud Documentation Center

Creates a topic in ApsaraMQ for RocketMQ. A topic is a top-level container for message transmission and storage. It identifies messages that belong to the same business logic. In the message model, producers send messages to a topic, and consumers subscribe to the topic to consume the messages.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

rocketmq:CreateTopic

create

*Topic

acs:rocketmq:{#regionId}:{#accountId}:instance/{#InstanceId}/topic/{#TopicName}

None

Request syntax

POST /instances/{instanceId}/topics/{topicName} HTTP/1.1

Path Parameters

Parameter	Type	Required	Description	Example
instanceId	string	Yes	The ID of the instance that contains the topic.	rmq-cn-7e22ody****
topicName	string	Yes	The name of the topic to create. The name must be globally unique. The name must meet the following requirements: It can contain letters (a to z and A to Z), digits (0 to 9), underscores (_), and hyphens (-). It must be 1 to 60 characters in length. For more information about reserved characters, see Parameter limits.	topic_test

Request parameters

Parameter	Type	Required	Description	Example
body	object	No	The information about the topic.
messageType	string	Yes	The message type of the topic to create. Valid values: TRANSACTION: transactional message FIFO: ordered message DELAY: scheduled and delayed message NORMAL: normal message Important The topic type must be the same as the message type. For example, if you create a topic for ordered messages, the topic can only be used to send and receive ordered messages. It cannot be used for other message types. Valid values: TRANSACTION : transactional message FIFO : ordered message DELAY : scheduled and delayed message NORMAL : normal message	NORMAL
remark	string	No	The remarks on the topic.	This is the remark for test.
maxSendTps	integer	No	The maximum transactions per second (TPS) for sending messages.	1500
liteTopicExpiration	integer	No	The expiration time of a lite topic, in minutes. Valid values: 15 to 720. The default value is -1, which indicates that the topic is permanent.	20

Response elements

Element	Type	Description	Example
	object	Result
requestId	string	The ID of the request. This ID is unique to each request. You can use this ID to troubleshoot issues.	AF9A8B10-C426-530F-A0DD-96320B39****
success	boolean	Indicates whether the request was successful.	true
data	boolean	The returned data.	true
code	string	The error code.	Topic.Existed
message	string	The error message.	The topic already exists.
httpStatusCode	integer	The HTTP status code.	400
dynamicCode	string	The dynamic error code.	TopicName
dynamicMessage	string	The dynamic error message.	topicName

Examples

Success response

JSON format

{
  "requestId": "AF9A8B10-C426-530F-A0DD-96320B39****",
  "success": true,
  "data": true,
  "code": "Topic.Existed",
  "message": "The topic already exists.",
  "httpStatusCode": 400,
  "dynamicCode": "TopicName",
  "dynamicMessage": "topicName"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.