This API is used to modify a topic.

PUT /v2/{project_id}/instances/{instance_id}/topics/{topic}

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition Project ID. For details about how to obtain it, see Obtaining a Project ID. Constraints N/A Range N/A Default Value N/A
instance_id	Yes	String	Definition Instance ID. You can call the API for querying all instances to obtain the instance ID. The instance ID is in the response body. Constraints N/A Range N/A Default Value N/A
topic	Yes	String	Definition Topic name. Constraints N/A Range N/A Default Value N/A

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
topic_desc	No	String	Definition: Topic description. Constraints: N/A Range: N/A Default Value: N/A

Status code: 204

The topic is modified.

None

Changing a specified topic's total read queues to 3 and total write queues to 3

PUT https://{endpoint}/v2/{project_id}/instances/{instance_id}/topics/{topic}

{
  "topic_desc" : "topic_description"
}

None

Status Code	Description
204	The topic is modified.

Modifying a Topic