Function

This API is used to remove nodes from a specified DDM instance.

Constraints

Make sure that the associated RDS instances are available and not undergoing other operations.

URI

POST /v2/{project_id}/instances/{instance_id}/action/reduce

**Table 1** Path parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID of a tenant in a region
instance_id	Yes	String	DDM instance ID

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token. It can be obtained by calling an IAM API. The value of X-Subject-Token in the response header is the user token.
Content-Type	Yes	String	MIME type of the request body. Value range: application/json application/json;charset=utf-8

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
node_number	Yes	Integer	Number of nodes to be removed. The maximum value is the instance nodes minus 1.
group_id	No	String	Group ID, which specifies the group that is scaled out. This parameter must be specified if there are more than one node group. It can be obtained from Obtaining the Instance Group Information (a V3 API).

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
instanceId	String	DDM instance ID
instanceName	String	DDM instance name
jobId	String	Task ID

Status code: 400

**Table 5** Response body parameters
Parameter	Type	Description
errCode	String	Service error code
externalMessage	String	Error message

Status code: 500

**Table 6** Response body parameters
Parameter	Type	Description
errCode	String	Service error code
externalMessage	String	Error message

Example Request

Example request

POST https://ddm.eu-de.otc.t-systems.com/v2/619d3e78f61b4be68bc5aa0b59edcf7b/instances/1f5c9fd6cd984056ba89c8c87cc03278in09/action/reduce

{
  "node_number" : 2
}

Example request where the DDM instance has more than one group

POST https://ddm.eu-de.otc.t-systems.com/v2/619d3e78f61b4be68bc5aa0b59edcf7b/instances/1f5c9fd6cd984056ba89c8c87cc03278in09/action/reduce

{
  "group_id" : "f080abf2010d45118068c28c8958f5fcgr09",
  "node_number" : 1
}

Example Response

Status code: 200

ok

{
  "instanceId" : "28e8841d0b9c4f6a9a30742ee60e1068in09",
  "instanceName" : "ddm-test",
  "jobId" : "1eb697c0-1842-43a3-8671-f562d0385cb9"
}

Status code: 400

bad request

{
  "externalMessage" : "Parameter error.",
  "errCode" : "DBS.280001"
}

Status code: 500

server error

{
  "externalMessage" : "Server failure.",
  "errCode" : "DBS.200412"
}

Status Codes

Status Code	Description
200	ok
400	bad request
500	server error

Error Codes

For details, see Error Codes.

Scaling In a DDM instance (a V2 API)