Amazon Exam DVA-C02 Topic 1 Question 35 Discussion

Actual exam question for Amazon's DVA-C02 exam

Question #: 35
Topic #: 1

A developer wants the ability to roll back to a previous version of an AWS Lambda function in the event of errors caused by a new deployment. How can the developer achieve this with MINIMAL impact on users?

AChange the application to use an alias that points to the current version. Deploy the new version of the code Update the alias to use the newly deployed version. If too many errors are encountered, point the alias back to the previous version.

BChange the application to use an alias that points to the current version. Deploy the new version of the code. Update the alias to direct 10% of users to the newly deployed version. If too many errors are encountered, send 100% of traffic to the previous version

CDo not make any changes to the application. Deploy the new version of the code. If too many errors are encountered, point the application back to the previous version using the version number in the Amazon Resource Name (ARN).

DCreate three aliases: new, existing, and router. Point the existing alias to the current version. Have the router alias direct 100% of users to the existing alias. Update the application to use the router alias. Deploy the new version of the code. Point the new alias to this version. Update the router alias to direct 10% of users to the new alias. If too many errors are encountered, send 100% of traffic to the existing alias.

Show Suggested Answer

Suggested Answer: A

Pseudo Parameters:CloudFormation provides pseudo parameters that reference runtime context, including the current AWS Region.

Operational Efficiency:TheAWS::Regionpseudo parameter offers the most direct and self-contained way to obtain the Region dynamically within the template.

CloudFormation Pseudo Parameters:https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/pseudo-parameter-reference.html

by Charisse at Sep 10, 2024, 07:43 AM

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Cherry

21 days ago

I'm feeling a bit like a 'lambda' in this exam question. Get it? 'Lambda' function? Eh, tough crowd.

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Delsie

24 days ago

Why not just have the app auto-rollback to the previous version if it detects too many errors? That would be the most seamless approach.

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Patti

14 hours ago

A) Change the application to use an alias that points to the current version. Deploy the new version of the code Update the alias to use the newly deployed version. If too many errors are encountered, point the alias back to the previous version.

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2 months ago

Option A seems like a straightforward way to roll back to the previous version. I like how it minimizes the impact on users.

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Santos

21 days ago

I agree, using an alias to switch versions is a smart approach.

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Rosalia

25 days ago

Option A seems like a good choice. It allows for easy rollback if needed.

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