DVA-C02 · Question #258
A developer is building a serverless application by using AWS Serverless Application Model (AWS SAM) on multiple AWS Lambda functions. When the application is deployed, the developer wants to shift 10
The correct answer is A. Set the Deployment Preference Type to Canary10Percent10Minutes. Set the AutoPublishAlias. The Canary10Percent10Minutes deployment preference type shifts exactly 10% of traffic to the new Lambda version for 10 minutes, then shifts all remaining traffic if no alarms fire.
Question
A developer is building a serverless application by using AWS Serverless Application Model (AWS SAM) on multiple AWS Lambda functions. When the application is deployed, the developer wants to shift 10% of the traffic to the new deployment of the application for the first 10 minutes after deployment. If there are no issues, all traffic must switch over to the new version. Which change to the AWS SAM template will meet these requirements?
Options
- ASet the Deployment Preference Type to Canary10Percent10Minutes. Set the AutoPublishAlias
- BSet the Deployment Preference Type to Linear10PercentEvery10Minutes. Set AutoPublishAlias
- CSet the Deployment Preference Type to Canary10Percent10Minutes. Set the PreTraffic and
- DSet the Deployment Preference Type to Linear10PercentEvery10Minutes. Set PreTraffic and
How the community answered
(37 responses)- A84% (31)
- B3% (1)
- C3% (1)
- D11% (4)
Why each option
The Canary10Percent10Minutes deployment preference type shifts exactly 10% of traffic to the new Lambda version for 10 minutes, then shifts all remaining traffic if no alarms fire.
Canary10Percent10Minutes is a predefined AWS CodeDeploy deployment preference that routes 10% of traffic to the new Lambda alias for a 10-minute bake period, then shifts 100% of traffic at once. Setting AutoPublishAlias enables Lambda versioning and alias management required for traffic shifting.
Linear10PercentEvery10Minutes shifts an additional 10% every 10 minutes incrementally until 100% is reached, which would take 100 minutes total. This does not match the requirement of shifting all traffic after just 10 minutes.
PreTraffic and PostTraffic hooks are used for running validation Lambda functions before and after deployment, not for configuring the traffic shift percentage or timing. They are optional and not required to meet this requirement.
Linear10PercentEvery10Minutes does not meet the timing requirement, and PreTraffic/PostTraffic hooks do not control the traffic shift schedule.
Concept tested: AWS SAM canary deployment preference for Lambda traffic shifting
Source: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/automating-updates-to-serverless-apps.html
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