ModifyNodeNumberPreCheck - E-MapReduce - Alibaba Cloud Documentation Center

Performs a precheck before you modify the number of nodes in a warehouse of an E-MapReduce (EMR) Serverless StarRocks instance.

Debugging

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Debug

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:
- For mandatory resource types, indicate with a prefix of * .
- If the permissions cannot be granted at the resource level, All Resources is 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
sr:ModifyNodeNumberPreCheck	get	*Instance `acs:sr:{#regionId}:{#accountId}:instance/{#InstanceId}`	none	none

Request syntax

POST /webapi/resourceChange/modifyNodeNumberPreCheck HTTP/1.1

Request parameters

Parameter	Type	Required	Description	Example
InstanceId	string	Yes	The instance ID.	c-b25e21e24388****
NodeGroupId	string	Yes	The warehouse ID.	ng-3d5ce6454354****
Target	integer	Yes	The number of nodes to which you want to change to.	3

Response parameters

Parameter	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	object	The returned data.
Allow	boolean	Indicates whether the number of nodes can be modified.	true
Reason	string	The reason why the number of nodes cannot be modified.	Failed to find node group[ng-3d5ce6454354****].
AccessDeniedDetail	string	The detailed information about the failed permission verification.	{ "PolicyType": "AccountLevelIdentityBasedPolicy", "AuthPrincipalOwnerId": "xxx", "EncodedDiagnosticMessage": "xxx", "AuthPrincipalType": "xxx", "AuthPrincipalDisplayName": "xxx", "NoPermissionType": "ImplicitDeny", "AuthAction": "sr:xxx" }

Examples

Sample success responses

JSONformat

{
  "HttpStatusCode": 200,
  "RequestId": "32A44F0D-BFF6-5664-999A-218BBDE7****",
  "Success": false,
  "ErrCode": "InvalidParams",
  "ErrMessage": "Invalid params: [instance not exists].",
  "Data": {
    "Allow": true,
    "Reason": "Failed to find node group[ng-3d5ce6454354****]."
  },
  "AccessDeniedDetail": {
    "PolicyType": "AccountLevelIdentityBasedPolicy",
    "AuthPrincipalOwnerId": "xxx",
    "EncodedDiagnosticMessage": "xxx",
    "AuthPrincipalType": "xxx",
    "AuthPrincipalDisplayName": "xxx",
    "NoPermissionType": "ImplicitDeny",
    "AuthAction": "sr:xxx"
  }
}

Error codes

For a list of error codes, visit the Service error codes.