Perform a scale-out operation on the target node group.
Debugging
Authorization information
The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:
- Operation: the value that you can use in the Action element to specify the operation on a resource.
- Access level: the access level of each operation. The levels are read, write, and list.
- Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- The required resource types are displayed in bold characters.
- If the permissions cannot be granted at the resource level,
All Resourcesis used in the Resource type column of the operation.
- Condition Key: the condition key that is defined by the cloud service.
- Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.
| Operation | Access level | Resource type | Condition key | Associated operation |
|---|---|---|---|---|
| emr:DecreaseNodes | update | *All Resources * |
| none |
Request parameters
| Parameter | Type | Required | Description | Example |
|---|---|---|---|---|
| RegionId | string | Yes | The ID of the region in which you want to create the instance. | cn-hangzhou |
| ClusterId | string | Yes | The cluster ID. | c-b933c5aac8fe**** |
| NodeGroupId | string | Yes | The ID of the node group. | ng-869471354ecd**** |
| DecreaseNodeCount | integer | No | The number of nodes to scale in. The number of nodes to be scaled in. The value should be less than the number of surviving nodes in the current node group. | 3 |
| NodeIds | array | No | The array of node IDs. Valid values of array element N: 1 to 500. | |
| String | string | No | The node ID. | i-bp1cudc25w2bfwl5**** |
| BatchInterval | integer | No | The cooldown interval between two batches. | |
| BatchSize | integer | No | The number of nodes to be removed in a single batch. |
Response parameters
Examples
Sample success responses
JSONformat
{
"OperationId": "op-13c37a77c505****",
"RequestId": "44430037-E59A-3E66-A2B0-97D155346F22"
}Error codes
| HTTP status code | Error code | Error message |
|---|---|---|
| 400 | OperationDenied | The operation is invalid. %s |
| 400 | ConcurrentModification | The request on %s failed due to multiple requests to change this object were submitted simultaneously. Wait a few minutes and try again. |
| 400 | ConflictParameters | Parameters that must not be used together. %s |
| 400 | IncompleteSignature | The request signature is invalid. |
| 400 | InvalidAction | The action %s requested is invalid. |
| 400 | InvalidParameter | The specified parameter %s is not valid. |
| 400 | InvalidParameterValue | The input parameter %s is invalid or out of range. |
| 400 | MissingAction | The action %s requested is missing. |
| 400 | MissingParameter | The input parameter %s that is mandatory for processing this request is not supplied. |
| 400 | NotAuthorized | You do not have permission to perform this action. %s |
| 400 | ThrottlingException | The request was denied due to request throttling. %s |
| 404 | ResourceNotFound | The resource not found by %s. |
| 500 | InternalError | The request processing has failed due to some unknown error, exception or failure. |
| 503 | ServiceFailure | The request has failed due to a temporary failure of %s service. |
| 503 | ServiceUnavailable | The request has failed due to a temporary failure of the server. |
For a list of error codes, visit the Service error codes.
Change history
| Change time | Summary of changes | Operation |
|---|---|---|
| 2024-11-28 | The Error code has changed. The request parameters of the API has changed | View Change Details |
| 2024-06-18 | The Error code has changed | View Change Details |