Function

This API is used to add instances of different types and expand instance storage capacity in a cluster. This API is available for clusters with master, client, or cold data nodes.

Calling Method

For details, see Calling APIs.

URI

POST /v1.0/{project_id}/clusters/{cluster_id}/role_extend

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition: Project ID. For details about how to obtain the project ID and name, see Obtaining the Project ID and Name. Constraints: N/A Value range: Project ID of the account. Default value: N/A
cluster_id	Yes	String	Definition: ID of the cluster you want to scale out. For details about how to obtain the cluster ID, see Obtaining the Cluster ID. Constraints: N/A Value range: Cluster ID. Default value: N/A

Request Parameters

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
grow	Yes	Array of RoleExtendGrowReq objects	Definition: Detailed description about the cluster scale-out request. Constraints: N/A Value range: N/A Default value: N/A

**Table 3** RoleExtendGrowReq
Parameter	Mandatory	Type	Description
type	Yes	String	Definition: Type of the instance to be scaled out. Constraints: You can only add instances, rather than increase storage capacity, on nodes of the ess-master and ess-client types. Value range: ess: data node ess-master: master node ess-client: client node ess-cold: cold data node You can select multiple node types, but cannot select the same node for different roles. Default value: N/A
nodesize	Yes	Integer	Definition: Number of instances you want to add. Constraints: After scaling, the number of nodes of each type must meet the following requirements: Data nodes: If the cluster does not have master nodes, the value ranges from 1 to 32. Otherwise, the value ranges from 1 to 200. Master nodes: 3, 5, 7, or 9 (must be an odd number from 3 to 9) Client nodes: 1 to 32. Cold data nodes: 1 to 32. Value range: See Constraints. Default value: N/A
disksize	Yes	Integer	Definition: Storage capacity to be added, in GB Constraints: The sum of the original instance storage capacity plus the expanded instance storage capacity cannot exceed the default upper limit of storage capacity set during cluster creation. If there is no need to add more instances, set this parameter to 0. Value range: The scale-out step of ESS and ESS-cold nodes is 20. Storage capacity of ess-master and ess-client nodes cannot be expanded. Default value: N/A

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
id	String	Definition: Cluster ID. Value range: N/A

Example Requests

Change the number of instances and storage capacity of the current cluster.

POST https://{Endpoint}/v1.0/{project_id}/clusters/4f3deec3-efa8-4598-bf91-560aad1377a3/role_extend

{
  "grow" : [ {
    "type" : "ess-master",
    "nodesize" : 2,
    "disksize" : 0
  }, {
    "type" : "ess",
    "nodesize" : 0,
    "disksize" : 40
  }, {
    "type" : "ess-client",
    "nodesize" : 1,
    "disksize" : 0
  }, {
    "type" : "ess-cold",
    "nodesize" : 1,
    "disksize" : 0
  } ],
  "is_auto_pay" : 1
}

Example Responses

Status code: 200

Request succeeded.

{
  "id" : "4f3deec3-efa8-4598-bf91-560aad1377a3"
}

Status Codes

Status Code	Description
200	Request succeeded.
400	Invalid request. Modify the request before retry.
404	The requested resource could not be found. Modify the request before retry.

Status Code

Description

200

Request succeeded.

400

Invalid request.

Modify the request before retry.

404

The requested resource could not be found.