Querying CNs

Function

This API is used to query CNs. Before calling this API:

Learn how to authenticate this API.
Obtain the required region and endpoint.

URI

GET https://{Endpoint}/v3/{project_id}/instances/{instance_id}/coordinators

**Table 1** Parameter description
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID of a tenant in a region. For details about how to obtain the project ID, see Obtaining a Project ID.
instance_id	Yes	String	Instance ID, which is compliant with the UUID format.
offset	No	Integer	Index offset. If offset is set to N, the resource query starts from the N+1 data entry. The default value is 0, indicating that the query starts from the first data entry. The value cannot be a negative number.
limit	No	Integer	Number of records to be queried. The default value is 200. The value cannot be a negative number. The minimum value is 1 and the maximum value is 200.

Request Parameters

None

Response Parameters

**Table 2** Response body parameters
Parameter	Type	Description
instance_id	String	Instance ID.
max_reduction_num	Integer	Maximum number of nodes that can be deleted at a time.
nodes	Array of Table 3 objects	Node information list.

**Table 3** CnInfoBeforeReduce
Parameter	Type	Description
id	String	Node ID.
name	String	Node name.
status	String	Node status. normal: The node is normal. abnormal: The node is abnormal. creating: The node is being created. createfail: The node fails to be created.
availability_zone	String	AZ.
support_reduce	Boolean	Whether the node can be deleted.

Example Request

Querying CNs

GET https://gaussdb-opengauss.ap-southeast-1.myhuaweicloud.com/v3/0483b6b16e954cb88930a360d2c4e663/instances/cc6fd964d93f4003851dfc29d57d30a5in14/coordinators

Example Response

CNs queried.

{ 
  "instance_id" : "cc6fd964d93f4003851dfc29d57d30a5in14", 
  "max_reduction_num" : 10, 
  "nodes" : [ { 
    "id" : "25b7f16ee4084b7884d52f1bdfab4e68no14", 
    "name" : "UTS-gauss-7362_gaussdbv5cn_0", 
    "status" : "normal", 
    "availability_zone" : "az2", 
    "support_reduce" : true 
  }, { 
    "id" : "ad6f02f31744422fa8ce487e81c9e7afno14", 
    "name" : "UTS-gauss-7362_gaussdbv5cn_1", 
    "status" : "normal", 
    "availability_zone" : "az3", 
    "support_reduce" : true 
  } ] 
}