Updated on 2025-08-15 GMT+08:00

Scaling Out a Cluster (Discarded)

Function

This API is used to add instances to a cluster (only Elasticsearch instances can be added). This API can only scale out clusters that only have common nodes. Clusters with master, client, or cold data nodes cannot use this API.

For details about how to configure the number and storage capacity of instances in a cluster, see the API for Adding Instances and Expanding Instance Storage Capacity.

Calling Method

For details, see Calling APIs.

URI

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

ExtendClusterGrowReq object

Definition:

Detailed description about the cluster scale-out request.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

isAutoPay

No

Integer

Definition:

Whether to enable automatic payment from your Huawei Cloud account. This parameter takes effect only for yearly/monthly clusters.

Constraints:

N/A

Value range:

  • 1: Yes. (Discounts and coupons are automatically selected. The fee will be automatically deducted from your Huawei Cloud account.) If the automatic payment fails, an unpaid order will be generated, and you need to manually complete the payment. (During manual payment, you can still modify the discounts and coupons that were automatically selected.)

  • 0: No. (The customer needs to manually pay for the bill. Discounts and coupons can be used.) The default value is 0.

Default value:

0

Table 3 ExtendClusterGrowReq

Parameter

Mandatory

Type

Description

modifySize

Yes

Integer

Definition:

Number of instances to be scaled out. The total number of existing instances and newly added instances in a cluster cannot exceed 32.

Constraints:

N/A

Value range:

1-32

Default value:

N/A

Response Parameters

Status code: 200

Request succeeded.

None

Example Requests

Change the number of instances in the current cluster.

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

{
  "grow" : {
    "modifySize" : 4
  },
  "isAutoPay" : 1
}

Example Responses

None

SDK Sample Code

The SDK sample code is as follows.

Java

Change the number of instances in the current cluster.

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.css.v1.region.CssRegion;
import com.huaweicloud.sdk.css.v1.*;
import com.huaweicloud.sdk.css.v1.model.*;


public class UpdateExtendClusterSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        CssClient client = CssClient.newBuilder()
                .withCredential(auth)
                .withRegion(CssRegion.valueOf("<YOUR REGION>"))
                .build();
        UpdateExtendClusterRequest request = new UpdateExtendClusterRequest();
        request.withClusterId("{cluster_id}");
        ExtendClusterReq body = new ExtendClusterReq();
        ExtendClusterGrowReq growbody = new ExtendClusterGrowReq();
        growbody.withModifySize(4);
        body.withIsAutoPay(1);
        body.withGrow(growbody);
        request.withBody(body);
        try {
            UpdateExtendClusterResponse response = client.updateExtendCluster(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Python

Change the number of instances in the current cluster.

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkcss.v1.region.css_region import CssRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkcss.v1 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = CssClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(CssRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = UpdateExtendClusterRequest()
        request.cluster_id = "{cluster_id}"
        growbody = ExtendClusterGrowReq(
            modify_size=4
        )
        request.body = ExtendClusterReq(
            is_auto_pay=1,
            grow=growbody
        )
        response = client.update_extend_cluster(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

Change the number of instances in the current cluster.

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    css "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/css/v1"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/css/v1/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/css/v1/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := css.NewCssClient(
        css.CssClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.UpdateExtendClusterRequest{}
	request.ClusterId = "{cluster_id}"
	growbody := &model.ExtendClusterGrowReq{
		ModifySize: int32(4),
	}
	isAutoPayExtendClusterReq:= int32(1)
	request.Body = &model.ExtendClusterReq{
		IsAutoPay: &isAutoPayExtendClusterReq,
		Grow: growbody,
	}
	response, err := client.UpdateExtendCluster(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

More

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

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.

Error Codes

See Error Codes.