Updated on 2026-06-22 GMT+08:00

Adding CN Nodes in Batches

Function

After a cluster is created, the number of required CN nodes varies with workloads. You can add or delete CN nodes as needed.

  • Other O&M operations cannot be performed during CN addition or deletion.

  • Services need to be stopped during CN node addition or deletion. You are advised to perform this operation during off-peak hours or when services are interrupted.

  • If a fault occurs during CN node addition or deletion and the rollback fails, you need to log in to the backend to rectify the fault. For details, see "Cluster Usage" > "Failed to Roll Back CN Addition or Deletion" in Troubleshooting.

Calling Method

For details, see Calling APIs.

URI

POST /v1.0/{project_id}/clusters/{cluster_id}/cns/batch-create

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Definition

Project ID. To obtain the value, see Obtaining a Project ID.

Constraints

N/A

Range

N/A

Default Value

N/A

cluster_id

Yes

String

Definition

Cluster ID. For details about how to obtain the value, see Obtaining the Cluster ID.

Constraints

N/A

Range

N/A

Default Value

N/A

Request Parameters

Table 2 Request body parameters

Parameter

Mandatory

Type

Description

num

Yes

Integer

Definition

Total number of CN nodes in the cluster after new CN nodes are added in batches. The number of CN nodes supported by a cluster depends on the cluster version and number of nodes. For details, see "Querying CN Nodes in a Cluster", where min_num indicates the minimum number of CN nodes, and max_num indicates the maximum number of CN nodes.

Constraints

N/A

Range

N/A

Default Value

N/A

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

job_id

String

Definition

ID of the task for adding CN nodes in batches.

Range

N/A

Example Requests

Add three CN nodes in batches.

POST https://{Endpoint}/v1.0/89cd04f168b84af6be287f71730fdb4b/clusters/b5c45780-1006-49e3-b2d5-b3229975bbc7/cns/batch-create

{
  "num" : 3
}

Example Responses

Status code: 200

The CN nodes are successfully added in batches.

{
  "job_id" : "2c908185841339ce018414e9944b0020"
}

SDK Sample Code

The SDK sample code is as follows.

Add three CN nodes in batches.

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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.dws.v2.region.DwsRegion;
import com.huaweicloud.sdk.dws.v2.*;
import com.huaweicloud.sdk.dws.v2.model.*;


public class BatchCreateClusterCnSolution {

    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);

        DwsClient client = DwsClient.newBuilder()
                .withCredential(auth)
                .withRegion(DwsRegion.valueOf("<YOUR REGION>"))
                .build();
        BatchCreateClusterCnRequest request = new BatchCreateClusterCnRequest();
        request.withClusterId("{cluster_id}");
        BatchCreateCn body = new BatchCreateCn();
        body.withNum(3);
        request.withBody(body);
        try {
            BatchCreateClusterCnResponse response = client.batchCreateClusterCn(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());
        }
    }
}

Add three CN nodes in batches.

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkdws.v2.region.dws_region import DwsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkdws.v2 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 = DwsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(DwsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = BatchCreateClusterCnRequest()
        request.cluster_id = "{cluster_id}"
        request.body = BatchCreateCn(
            num=3
        )
        response = client.batch_create_cluster_cn(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Add three CN nodes in batches.

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    dws "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dws/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dws/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dws/v2/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 := dws.NewDwsClient(
        dws.DwsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.BatchCreateClusterCnRequest{}
	request.ClusterId = "{cluster_id}"
	request.Body = &model.BatchCreateCn{
		Num: int32(3),
	}
	response, err := client.BatchCreateClusterCn(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

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

The CN nodes are successfully added in batches.

400

Request error.

401

Authentication failed.

403

You do not have required permissions.

404

No resources found.

500

Internal server error.

503

Service unavailable.