ModifyNodeNumber - E-MapReduce - Alibaba Cloud Documentation Center

Operation description

Before you call this operation, ensure that you understand the billing methods and billable items of Serverless StarRocks. Note the following:

You can modify the number of nodes in a compute group only for standard instances. This operation is not supported for starter instances.
The instance must be in the Running state.
The number of frontend (FE) nodes cannot be an even number. You cannot scale in FE nodes.

After you modify the number of nodes, the billing rules change as follows:

Pay-as-you-go: You are billed based on the new number of nodes.
Subscription: For a subscription instance, you must pay a supplementary fee. This fee is calculated based on the price difference between the new and old configurations and the remaining subscription duration. The remaining duration is calculated starting from 00:00 of the next day.

Try it now

Try this API in OpenAPI Explorer, no manual signing needed. Successful calls auto-generate SDK code matching your parameters. Download it with built-in credential security for local usage.

Test

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

sr:ModifyNodeNumber

get

*Instance

acs:sr:{#regionId}:{#accountId}:instance/{#InstanceId}

None

Request syntax

POST /webapi/resourceChange/modifyNodeNumber HTTP/1.1

Request parameters

Parameter	Type	Required	Description	Example
InstanceId	string	Yes	The instance ID.	c-b25e21e24388****
NodeGroupId	string	Yes	The compute group ID.	ng-3d5ce6454354****
Target	integer	Yes	The target number of nodes.	3
PromotionOptionNo	string	No

Response elements

Element	Type	Description	Example
	object
HttpStatusCode	integer	The HTTP status code.	200
RequestId	string	The request ID.	32A44F0D-BFF6-5664-999A-218BBDE7****
Success	boolean	Indicates whether the request was successful.	false
ErrCode	string	The error code.	InvalidParams
ErrMessage	string	The error message.	Invalid params: [instance not exists].
Data	integer	The order ID.	24151320976****
AccessDeniedDetail	string	Details about the access denial.	{ "PolicyType": "AccountLevelIdentityBasedPolicy", "AuthPrincipalOwnerId": "xxx", "EncodedDiagnosticMessage": "xxx", "AuthPrincipalType": "xxx", "AuthPrincipalDisplayName": "xxx", "NoPermissionType": "ImplicitDeny", "AuthAction": "sr:xxx" }

Examples

Success response

JSON format

{
  "HttpStatusCode": 200,
  "RequestId": "32A44F0D-BFF6-5664-999A-218BBDE7****",
  "Success": false,
  "ErrCode": "InvalidParams",
  "ErrMessage": "Invalid params: [instance not exists].",
  "Data": 0,
  "AccessDeniedDetail": "{     \"PolicyType\": \"AccountLevelIdentityBasedPolicy\",     \"AuthPrincipalOwnerId\": \"xxx\",     \"EncodedDiagnosticMessage\": \"xxx\",     \"AuthPrincipalType\": \"xxx\",     \"AuthPrincipalDisplayName\": \"xxx\",     \"NoPermissionType\": \"ImplicitDeny\",     \"AuthAction\": \"sr:xxx\"   }"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.