Configuring Replica Priority

Function

This API is used to configure the replica priority. When the master node is faulty, a replica with a smaller weight has a higher priority to be promoted to master.

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/instances/{instance_id}/groups/{group_id}/replications/{node_id}/slave-priority

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details, see Obtaining a Project ID.
instance_id	Yes	String	Instance ID.
group_id	Yes	String	Shard ID.
node_id	Yes	String	Node ID.

Request Parameters

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
slave_priority_weight	Yes	Integer	Replica priority. The value ranges from 0 to 100. Value 0 indicates that the promotion is disabled by default.

Response Parameters

Status code: 204

Replica priority configured successfully.

Status code: 400

**Table 3** Response body parameters
Parameter	Type	Description
error_msg	String	Parameter description: Error message. Value range: N/A.
error_code	String	Parameter description: Error code. Value range: For details, see Error Codes.
error_ext_msg	String	Parameter description: Extended error information. This parameter is not used currently and is set to null. Value range: N/A.

Status code: 401

**Table 4** Response body parameters
Parameter	Type	Description
error_msg	String	Parameter description: Error message. Value range: N/A.
error_code	String	Parameter description: Error code. Value range: For details, see Error Codes.
error_ext_msg	String	Parameter description: Extended error information. This parameter is not used currently and is set to null. Value range: N/A.

Status code: 403

**Table 5** Response body parameters
Parameter	Type	Description
error_msg	String	Parameter description: Error message. Value range: N/A.
error_code	String	Parameter description: Error code. Value range: For details, see Error Codes.
error_ext_msg	String	Parameter description: Extended error information. This parameter is not used currently and is set to null. Value range: N/A.

Status code: 404

**Table 6** Response body parameters
Parameter	Type	Description
error_msg	String	Parameter description: Error message. Value range: N/A.
error_code	String	Parameter description: Error code. Value range: For details, see Error Codes.
error_ext_msg	String	Parameter description: Extended error information. This parameter is not used currently and is set to null. Value range: N/A.

Status code: 500

**Table 7** Response body parameters
Parameter	Type	Description
error_msg	String	Parameter description: Error message. Value range: N/A.
error_code	String	Parameter description: Error code. Value range: For details, see Error Codes.
error_ext_msg	String	Parameter description: Extended error information. This parameter is not used currently and is set to null. Value range: N/A.

Example Requests

Setting the replica priority to 100

POST https://{dcs_endpoint}/v2/{project_id}/instances/{instance_id}/groups/{group_id}/replications/{node_id}/slave-priority

{
  "slave_priority_weight" : 100
}

Example Responses

None

Status Codes

Status Code	Description
204	Replica priority configured successfully.
400	Invalid request.
401	Invalid authentication information.
403	The request is rejected.
404	The requested resource is not found.
500	Internal service error.