DecreaseNodes - E-MapReduce - Alibaba Cloud Documentation Center

Scales in a target node group.

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

emr:DecreaseNodes

update

*All Resource

*

None

Request parameters

Parameter	Type	Required	Description	Example
RegionId	string	Yes	The region ID.	cn-hangzhou
ClusterId	string	Yes	The cluster ID.	c-b933c5aac8fe****
NodeGroupId	string	Yes	The node group ID.	ng-869471354ecd****
DecreaseNodeCount	integer	No	The number of nodes to remove. The value must be less than the number of active nodes in the node group.	3
NodeIds	array	No	An array of node IDs. The array can contain from 1 to 500 elements.	["i-bp1cudc25w2bfwl5****"]
	string	No	A node ID.	i-bp1cudc25w2bfwl5****
BatchInterval	integer	No	The cooldown time between batches.
BatchSize	integer	No	The number of nodes to concurrently take offline in a single batch.

Response elements

Element	Type	Description	Example
	object	The returned data.
OperationId	string	The operation ID.	op-13c37a77c505****
RequestId	string	The request ID.	44430037-E59A-3E66-A2B0-97D155346F22

Examples

Success response

JSON format

{
  "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
500	InternalError	The request processing has failed due to some unknown error, exception or failure.
404	ResourceNotFound	The resource not found by %s.
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.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.