Policy: AWS > Well-Architected Tool > AWS Well-Architected Framework > Reliability > REL 04. How do you design interactions in a distributed system to prevent failures? > Make all responses idempotent

An idempotent service promises that each request is completed exactly once, such that making multiple identical requests has the same effect as making a single request. An idempotent service makes it easier for a client to implement retries without fear that a request will be erroneously processed multiple times. To do this, clients can issue API requests with an idempotency token—the same token is used whenever the request is repeated. An idempotent service API uses the token to return a response identical to the response that was returned the first time that the request was completed.

See Make all responses idempotent for more information.

Targets

This policy targets the following resource types:

AWS > Well-Architected Tool > AWS Well-Architected Framework

Primary Policy

This policy is used with the following primary policy:

AWS > Well-Architected Tool > AWS Well-Architected Framework > Reliability > REL 04. How do you design interactions in a distributed system to prevent failures?

Controls

Setting this policy configures this control:

AWS > Well-Architected Tool > AWS Well-Architected Framework > Reliability > REL 04. How do you design interactions in a distributed system to prevent failures?

Policy Specification

Schema Type	`string`
Default	`Skip`
Valid Values [YAML]	`Skip` `True` `False`

In Your Workspace

Policy Settings by Type report

Developers

Category URI

tmod:@turbot/turbot#/control/categories/other

Policy Type URI

tmod:@turbot/aws-wellarchitected-framework#/policy/types/rel04Idempotent

GraphQL

query policyType(id: "tmod:@turbot/aws-wellarchitected-framework#/policy/types/rel04Idempotent") { … }

query policySettings(filter: "policyTypeId:'tmod:@turbot/aws-wellarchitected-framework#/policy/types/rel04Idempotent'") { … }

query policyValues(filter: "policyTypeId:'tmod:@turbot/aws-wellarchitected-framework#/policy/types/rel04Idempotent'") { … }

CLI

Get Policy Type

turbot graphql policy-type --id "tmod:@turbot/aws-wellarchitected-framework#/policy/types/rel04Idempotent"

Get Policy Settings

turbot graphql policy-settings --filter "policyTypeId:tmod:@turbot/aws-wellarchitected-framework#/policy/types/rel04Idempotent"