Scale Serverless StarRocks Nodes via ModifyNodeNumber - E-MapReduce - Alibaba Cloud - E-MapReduce

Operation description

Before using this operation, make sure that you fully understand the billing method and billable items of Serverless StarRocks. When calling this operation, note the following:

Only Standard Standard instances support modifying the number of nodes in a compute group. Entry Standard instances do not support this operation.
The instance must be in the Running state.
The number of FE nodes cannot be an even number, and FE nodes do not support scale-in.

After modifying the node count, billing changes are as follows:

Pay-as-you-go: Billed based on the new node count.
Subscription: Within the billing cycle, the supplemental fee is calculated based on the price difference between the old and new configurations and the remaining days (from 00:00 of the next day to the end of the validity period).

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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	The coupon ID.	youhuiquan_promotion_option_id_for_blank
Parallelism	integer	No	The decommission concurrency for BE scale-in scenarios in compute-storage coupled mode. Default value: 1.	1
TerminationGracePeriodSeconds	integer	No	The wait time for running tasks to complete before dropping nodes during CN scale-in scenarios in compute-storage decoupled mode.	60
		No	Specifies whether to automatically purchase (pay for) all products specified in the Products parameter. Valid values: true: Automatic payment. false: No automatic payment.	true

Response elements

Element	Type	Description	Example
	object
AccessDeniedDetail	string	The details of the permission verification failure.	{ "PolicyType": "AccountLevelIdentityBasedPolicy", "AuthPrincipalOwnerId": "xxx", "EncodedDiagnosticMessage": "xxx", "AuthPrincipalType": "xxx", "AuthPrincipalDisplayName": "xxx", "NoPermissionType": "ImplicitDeny", "AuthAction": "sr:xxx" }
Data	integer	The order ID.	24151320976****
ErrCode	string	The error code.	InvalidParams
ErrMessage	string	The error message.	Invalid params: [instance not exists].
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

Examples

Success response

JSON format

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

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.