Creating a Read Replica

Function

This API is used to create a read replica. Before using this API:

URI

POST /v3/{project_id}/instances/{instance_id}/nodes/enlarge

Table 1 URI parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID of a tenant in a region.

To obtain this value, see Obtaining a Project ID.

instance_id

Yes

String

DB instance ID, which is compliant with the UUID format.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

User token.

X-Language

No

String

Language.

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

priorities

Yes

Array of integers

Failover priority of a read replica. Failover priority ranges from 1 for the first priority to 16 for the last priority. This priority determines the order in which read replicas are promoted when recovering from a primary node failure. Read replicas with the same priority have a same probability of being promoted to the new primary node.

Response Parameters

Status code: 201

Table 4 Response body parameters

Parameter

Type

Description

instance_id

String

DB instance ID.

node_names

Array of strings

Node name list

job_id

String

Read replica creation task ID.

This parameter is returned only when a pay-per-use read replica is created.

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Status code: 500

Table 6 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error message.

Example Request

Creating a read replica

POST https://gaussdb-mysql.eu-de.otc.t-systems.com/v3/054e292c9880d4992f02c0196d3ea468/instances/ba62a0b83a1b42bfab275829d86ac0fdin07/nodes/enlarge
{
  "priorities" : [ 1, 2 ]
}

Example Response

Status code: 201

Success.

{
  "instance_id" : "ba62a0b83a1b42bfab275829d86ac0fdin07",
  "node_names" : [ "gauss-ccf5_node03" ],
  "job_id" : "dff1d289-4d03-4942-8b9f-463ea07c000d"
}

Status Code

For details, see Status Codes.

Error Code

For details, see Error Codes.