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Showing content from https://docs.aws.amazon.com/step-functions/latest/apireference/API_UpdateStateMachineAlias.html below:

UpdateStateMachineAlias - AWS Step Functions

UpdateStateMachineAlias

Updates the configuration of an existing state machine alias by modifying its description or routingConfiguration.

You must specify at least one of the description or routingConfiguration parameters to update a state machine alias.

Note

UpdateStateMachineAlias is an idempotent API. Step Functions bases the idempotency check on the stateMachineAliasArn, description, and routingConfiguration parameters. Requests with the same parameters return an idempotent response.

Note

This operation is eventually consistent. All StartExecution requests made within a few seconds use the latest alias configuration. Executions started immediately after calling UpdateStateMachineAlias may use the previous routing configuration.

Related operations:

Request Syntax

{
   "description": "string",
   "routingConfiguration": [ 
      { 
         "stateMachineVersionArn": "string",
         "weight": number
      }
   ],
   "stateMachineAliasArn": "string"
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

description

A description of the state machine alias.

Type: String

Length Constraints: Maximum length of 256.

Required: No

routingConfiguration

The routing configuration of the state machine alias.

An array of RoutingConfig objects that specifies up to two state machine versions that the alias starts executions for.

Type: Array of RoutingConfigurationListItem objects

Array Members: Minimum number of 1 item. Maximum number of 2 items.

Required: No

stateMachineAliasArn

The Amazon Resource Name (ARN) of the state machine alias.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 256.

Required: Yes

Response Syntax

{
   "updateDate": number
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

updateDate

The date and time the state machine alias was updated.

Type: Timestamp

Errors

For information about the errors that are common to all actions, see Common Errors.

ConflictException

Updating or deleting a resource can cause an inconsistent state. This error occurs when there're concurrent requests for DeleteStateMachineVersion, PublishStateMachineVersion, or UpdateStateMachine with the publish parameter set to true.

HTTP Status Code: 409

HTTP Status Code: 400

InvalidArn

The provided Amazon Resource Name (ARN) is not valid.

HTTP Status Code: 400

ResourceNotFound

Could not find the referenced resource.

HTTP Status Code: 400

StateMachineDeleting

The specified state machine is being deleted.

HTTP Status Code: 400

ValidationException

The input does not satisfy the constraints specified by an AWS service.

HTTP Status Code: 400