Replacing a Node
Function
This API is used to replace a failed node.
If a node in an Elasticsearch cluster is faulty, you can replace it to restore services.
The node replacement process is as follows:
-
Migrate data from the node that needs to be replaced to other available nodes.
-
Rebuild the node using the original ID, IP address, specifications, and AZ.
-
Add the new node into the cluster. The system automatically triggers a shard reallocation, migrating some of the shards
to the new node
This process does not interrupt services because data is migrated from the replaced node to other available nodes.

Calling Method
For details, see Calling APIs.
URI
PUT /v1.0/{project_id}/clusters/{cluster_id}/instance/{instance_id}/replace
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 where nodes are to be replaced. 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 |
instance_id |
Yes |
String |
Definition: ID of the node to be replaced. Constraints: N/A Value range: Node ID. Obtain the ID attribute in instances by referring to Querying Cluster Details. Default value: N/A |
Parameter |
Mandatory |
Type |
Description |
---|---|---|---|
migrateData |
No |
String |
Definition: Whether to migrate data. Constraints: N/A Value range:
Default value: true |
agency |
No |
String |
Definition: Agency name. You can create an agency to allow CSS to call other cloud services. Constraints:
Value range: N/A Default value: N/A |
Request Parameters
None
Response Parameters
Status code: 200
Request succeeded.
None
Example Requests
Replace a node.
PUT https://{Endpoint}/v1.0/{project_id}/clusters/4f3deec3-efa8-4598-bf91-560aad1377a3/instance/43e63449-339c-4280-a6e9-da36b0685995/replace?migrateData=true
Example Responses
None
SDK Sample Code
The SDK sample code is as follows.
Java
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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 UpdateInstanceSolution { 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(); UpdateInstanceRequest request = new UpdateInstanceRequest(); request.withClusterId("{cluster_id}"); request.withInstanceId("{instance_id}"); try { UpdateInstanceResponse response = client.updateInstance(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
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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 = UpdateInstanceRequest() request.cluster_id = "{cluster_id}" request.instance_id = "{instance_id}" response = client.update_instance(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
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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.UpdateInstanceRequest{} request.ClusterId = "{cluster_id}" request.InstanceId = "{instance_id}" response, err := client.UpdateInstance(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. The client should modify the request instead of re-initiating it. |
404 |
The requested resource could not be found. The client should modify the request instead of re-initiating it. |
Error Codes
See Error Codes.
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