Restarting, Scaling Out, and Scaling In Queues

Function

This API is used to restart, scale out, and scale in queues.

Only SQL queues in the Available status can be restarted. (The queue status is Available only after the SQL job is successfully executed.)

URI

URI format
PUT /v1.0/{project_id}/queues/{queue_name}/action

Parameter description

**Table 1** URI parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID, which is used for resource isolation. For details about how to obtain its value, see Obtaining a Project ID.
queue_name	Yes	String	Name of a queue.

Request

**Table 2** Request parameters
Parameter	Mandatory	Type	Description
action	Yes	String	Operations to be performed: restart: Restart a service. Only queues for SQL jobs can be restarted. scale_out: Scale out the queue scale_in: Scale in the queue NOTE: Currently, only restart, scale_out, and scale_in operations are supported.
force	No	Boolean	Specifies whether to forcibly restart the queue. This parameter is optional when action is set to restart. The default value is false.
cu_count	No	Integer	Number of CUs to be scaled in or out. This parameter is optional when action is set to scale_out or scale_in. The value of cu_count must be a multiple of 16.

Response

**Table 3** Response parameters
Parameter	Mandatory	Type	Description
is_success	No	Boolean	Indicates whether the request is successfully executed. Value true indicates that the request is successfully executed.
message	No	String	System prompt. If execution succeeds, the parameter setting may be left blank.
job_id	No	String	Specifies the job ID returned when force is set to true.
queue_name	No	String	Name of the queue to be scaled in or out.
result	No	Boolean	Indicates the scaling result.

Example Request

Restart a queue.

{
    "action": "restart",
    "force": "false"
}

Increase the number of CUs of the queue to 16.

{
    "action": "scale_out",
    "cu_count": 16
}

Example Response

Set force to false.

{
    "is_success": true,
    "message": "Restart success"
}

Set force to true.

{
    "is_success": true,
    "message": "Submit restart job success, it need some time to cancel jobs, please wait for a while and check job status",
    "job_id": "d90396c7-3a25-4944-ad1e-99c764d902e7"
}

Scaling

{
    "queue_name": "myQueue",
    "result": true
}

Status Codes

Table 4 describes the status code.

**Table 4** Status codes
Status Code	Description
200	The operation is successful.
400	Request error.
500	Internal service error.

Error Codes

If an error occurs when this API is invoked, the system does not return the result similar to the preceding example, but returns the error code and error information. For details, see Error Codes.