Pool - Evaluate Auto Scale

Reference

Service:: Batch Service

API Version:: 2024-07-01.20.0

Gets the result of evaluating an automatic scaling formula on the Pool.
This API is primarily for validating an autoscale formula, as it simply returns the result without applying the formula to the Pool. The Pool must have auto scaling enabled in order to evaluate a formula.

POST {batchUrl}/pools/{poolId}/evaluateautoscale?api-version=2024-07-01.20.0

With optional parameters:

POST {batchUrl}/pools/{poolId}/evaluateautoscale?timeout={timeout}&api-version=2024-07-01.20.0

URI Parameters

Name	In	Required	Type	Description
batchUrl	path	True	string	The base URL for all Azure Batch service requests.
poolId	path	True	string	The ID of the Pool on which to evaluate the automatic scaling formula.
api-version	query	True	string	Client API Version.
timeout	query		integer int32	The maximum time that the server can spend processing the request, in seconds. The default is 30 seconds. If the value is larger than 30, the default will be used instead.

Request Header

Media Types: "application/json; odata=minimalmetadata"

Name	Required	Type	Description
client-request-id		string uuid	The caller-generated request identity, in the form of a GUID with no decoration such as curly braces, e.g. 9C4D50EE-2D56-4CD3-8152-34347DC9F2B0.
return-client-request-id		boolean	Whether the server should return the client-request-id in the response.
ocp-date		string date-time-rfc1123	The time the request was issued. Client libraries typically set this to the current system clock time; set it explicitly if you are calling the REST API directly.

Request Body

Media Types: "application/json; odata=minimalmetadata"

Name	Required	Type	Description
autoScaleFormula	True	string	The formula for the desired number of Compute Nodes in the Pool. The formula is validated and its results calculated, but it is not applied to the Pool. To apply the formula to the Pool, 'Enable automatic scaling on a Pool'. For more information about specifying this formula, see Automatically scale Compute Nodes in an Azure Batch Pool (https://azure.microsoft.com/documentation/articles/batch-automatic-scaling).

Responses

Name

Type

Description

200 OK

A response containing the results of the autoscale evaluation.

Headers

client-request-id: string
request-id: string
ETag: string
Last-Modified: string
DataServiceId: string

Other Status Codes

The error from the Batch service.

Security

azure_auth

Microsoft Entra OAuth 2.0 auth code flow

Type: oauth2
Flow: implicit
Authorization URL: https://login.microsoftonline.com/common/oauth2/authorize

Scopes

Name	Description
user_impersonation	Impersonate your user account

Authorization

Type: apiKey
In: header

Examples

Pool evaluate autoscale

Sample request

HTTP

POST account.region.batch.azure.com/pools/poolId/evaluateautoscale?api-version=2024-07-01.20.0



{
  "autoScaleFormula": "$TargetDedicated=1"
}

Sample response

Status code:: 200

{
  "timestamp": "2016-11-22T19:39:28.5246331Z",
  "results": "$TargetDedicated=1;$NodeDeallocationOption=requeue"
}

Definitions

Name	Description
AutoScaleRun	The results and errors from an execution of a Pool autoscale formula.
AutoScaleRunError	An error that occurred when executing or evaluating a Pool autoscale formula.
BatchError	An error response received from the Azure Batch service.
BatchErrorDetail	An item of additional information included in an Azure Batch error response.
ErrorMessage	An error message received in an Azure Batch error response.
NameValuePair	Represents a name-value pair.
PoolEvaluateAutoScaleParameter	Options for evaluating an automatic scaling formula on a Pool.

AutoScaleRun

The results and errors from an execution of a Pool autoscale formula.

Name	Type	Description
error	AutoScaleRunError	Details of the error encountered evaluating the autoscale formula on the Pool, if the evaluation was unsuccessful.
results	string	The final values of all variables used in the evaluation of the autoscale formula. Each variable value is returned in the form $variable=value, and variables are separated by semicolons.
timestamp	string	The time at which the autoscale formula was last evaluated.

AutoScaleRunError

An error that occurred when executing or evaluating a Pool autoscale formula.

Name	Type	Description
code	string	An identifier for the autoscale error. Codes are invariant and are intended to be consumed programmatically.
message	string	A message describing the autoscale error, intended to be suitable for display in a user interface.
values	NameValuePair[]	A list of additional error details related to the autoscale error.

BatchError

An error response received from the Azure Batch service.

Name	Type	Description
code	string	An identifier for the error. Codes are invariant and are intended to be consumed programmatically.
message	ErrorMessage	A message describing the error, intended to be suitable for display in a user interface.
values	BatchErrorDetail[]	A collection of key-value pairs containing additional details about the error.

BatchErrorDetail

An item of additional information included in an Azure Batch error response.

Name	Type	Description
key	string	An identifier specifying the meaning of the Value property.
value	string	The additional information included with the error response.

ErrorMessage

An error message received in an Azure Batch error response.

Name	Type	Description
lang	string	The language code of the error message
value	string	The text of the message.

NameValuePair

Represents a name-value pair.

Name	Type	Description
name	string	The name in the name-value pair.
value	string	The value in the name-value pair.

PoolEvaluateAutoScaleParameter

Options for evaluating an automatic scaling formula on a Pool.

Name	Type	Description
autoScaleFormula	string	The formula for the desired number of Compute Nodes in the Pool. The formula is validated and its results calculated, but it is not applied to the Pool. To apply the formula to the Pool, 'Enable automatic scaling on a Pool'. For more information about specifying this formula, see Automatically scale Compute Nodes in an Azure Batch Pool (https://azure.microsoft.com/documentation/articles/batch-automatic-scaling).