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E-MapReduce

E-MapReduce

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    • E-MapReduceAPI referenceEMR on ECS API referenceNode group managementScaleInNodeGroup - Scale in node group
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Node group management
ScaleInNodeGroup - Scale in node group
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ScaleInNodeGroup - Scale in node group

Scale in node group

Use cases

Call ScaleInNodeGroup to scale in a node group in an E-MapReduce (EMR) cluster.

Important notes

You must have a Volcano Engine account and have enabled EMR permissions.

Request note

Request method: POST
Request URL: https://emr.cn-beijing.volcengineapi.com/?Version=2023-08-15&Action=ScaleInNodeGroup

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Request parameters

The following table lists only the request parameters specific to this API and some common parameters. For more information, see common parameters.

Parameter
Type
Required
Example value
Description
Action
String
Yes

ScaleInNodeGroup

The operation to be performed. Value: ScaleInNodeGroup.

Version
String
Yes

2023-08-15

API version. Value: 2023-08-15.

ClientToken
String
No

xxx

A unique identifier generated by the caller for this request, used to ensure idempotency.

ScaleInNodeCount
String
Yes

2

Number of nodes to be scaled in.

ClusterId
String
Yes

emr-xxx

Cluster ID.

NodeGroupId
String
Yes

core-1.emr-xxx

Node group ID.

Response parameters

The following table lists only the response parameters specific to this API. For more information, see response structure

Parameter
Type
Example value
Description
ClusterId
String

emr-xxx

Cluster ID.

OperationId
String

Orderxxx

Cluster operation ID.

Sample request 

{ 
    "RequestId":null, 
    "RegionId":"cn-beijing", 
    "UserId":5xxx, 
    "AccountId":2100xxx, 
    "ClientToken":"1234xx", 
    "ClusterId":"emr-xxx", 
    "NodeGroupId":"task-1.emr-xxx", 
    "NodeIds":null, 
    "ScaleInNodeCount":1 
}

Sample response 

{ 
    "ResponseMetadata": { 
        "RequestId": "202312042119240BF2149851xxx", 
        "Action": "ScaleInNodeGroup", 
        "Version": "2023-08-15", 
        "Service": "emr", 
        "Region": "cn-beijing", 
        "Error": null, 
        "Deprecated": false 
    }, 
    "Result": { 
        "OperateId": "xxx", 
        "ClusterId": "emr-xxx", 
        "ResultData": null 
    } 
}

Error codes

The following table lists the error codes related to the business logic of this API. For common error codes, see the common error codes documentation.

Status code
Error code
Error message
Description
400
InvalidRequest
Access Denied {clusterId}

No permission for this cluster.

400
InvalidClusterId
cluster id {clusterId} not found

Cluster does not exist.

Last updated: 2026.06.01 17:04:20