Help Center/ GaussDB/ API Reference/ APIs (Recommended)/ Instance Management/ Switching Roles of the Primary and Standby DNs in Shards
Updated on 2024-08-20 GMT+08:00
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Switching Roles of the Primary and Standby DNs in Shards

Function

This API is used to perform a primary/standby DN switchover for one or more shards. In a shard, only one standby node can be promoted to primary. Before calling this API:

URI

POST https://{Endpoint}/v3/{project_id}/instances/{instance_id}/switch-shard
Table 1 Parameter description

Name

Mandatory

Description

project_id

Yes

Explanation:

Project ID of a tenant in a region.

For details about how to obtain the project ID, see Obtaining a Project ID.

Restrictions:

None

Value range:

The value can contain 32 characters. Only letters and digits are allowed.

Default value:

None

instance_id

Yes

DB instance ID.

Request Parameters

Table 2 Parameter description

Name

Mandatory

Type

Description

shards

Yes

Array

Nodes. You can switch standby DNs of multiple shards to primary DNs. The node information is the node IDs and component IDs of shards whose standby DNs are promoted to primary. For details, see Table 3.
Table 3 shards parameter description

Name

Mandatory

Type

Description

node_id

Yes

String

ID of the node where the standby DN to be promoted to primary is deployed.

component_id

Yes

String

ID of the standby DN to be promoted to primary. It contains up to 7 characters. It cannot be null, an empty string or spaces. Before verifying and using it, spaces are automatically filtered out. The value contains at least three types of the following: uppercase letters, lowercase letters, digits, and underscores (_). For details about how to obtain the component ID, see Querying the Components of a DB Instance.

Response Parameters

Table 4 Response parameters

Name

Type

Description

job_id

String

ID of the task for switching standby DNs of multiple shards to primary DNs.

Example Request

Switching roles of primary and standby DNs in multiple shards 
POST https://gaussdb-opengauss.ap-southeast-1.myhuaweicloud.com/v3/0c8243400d37468bb4aed3cc94c2911d/instances/f9b5f9b296ec6808e067in14/switch-shard
{
 
    "shards": [
        {
            "node_id": "0bc478b4d132494a8f7b804da521b4b2no14",
            "component_id": "dn_6001"
        },
        {
            "node_id": "53dee94c50574d36a0060db0a6b644f6no14",
            "component_id": "dn_6004"
        }
    ]
}

Example Response

Roles of the primary and standby DNs in the shards switched. 
{
	"job_id": "e96bbb23-e053-4bd0-b0b7-16ad3f5d9b6d"
}

Status Code

Error Code

For details, see Error Codes.

Parent topic: Instance Management