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Amazon DVA-C02 Exam - Topic 1 Question 35 Discussion

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?
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.
B) Change 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
C) Do 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).
D) Create 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.

Amazon DVA-C02 Exam - Topic 1 Question 35 Discussion

Actual exam question for Amazon's DVA-C02 exam
Question #: 35
Topic #: 1
[All DVA-C02 Questions]

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?

Show Suggested Answer Hide 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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Jina
6 months ago
C sounds risky, no gradual testing at all!
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Deane
6 months ago
Wait, can you really just switch aliases like that?
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Whitney
7 months ago
D seems overly complicated for just a rollback.
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Teresita
7 months ago
I think B is better for gradual rollouts.
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Shantell
7 months ago
Option A is the simplest way to roll back.
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Fanny
7 months ago
I’m leaning towards option B since it allows for a gradual rollout, but I’m not entirely sure if that’s the best way to handle errors.
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Adelle
7 months ago
I practiced a question like this, and I feel like option D is overcomplicated. I wonder if the simpler options might be just as effective.
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Tammi
8 months ago
I think option A sounds familiar because it’s straightforward, but I’m not confident if it minimizes user impact as much as option B might.
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Chauncey
8 months ago
I remember studying how aliases work with Lambda versions, but I'm not sure if we should use an alias for gradual traffic shifting or just roll back completely.
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Lennie
8 months ago
Option C seems the simplest, but I'm not sure if directly updating the ARN is the best practice here. I'll need to double-check the AWS documentation on that.
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Afton
8 months ago
Option D looks like the most robust solution, with the ability to gradually roll out the new version and easily roll back if needed. That's the one I'm leaning towards.
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Leigha
8 months ago
I'm a bit confused by the different alias options. I'll need to review the details of each approach more carefully before deciding.
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Orville
8 months ago
This question seems straightforward. I think option A is the best approach to minimize impact on users.
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Jeannetta
8 months ago
I'm a bit confused on this one. I know the CALs are important, but I'm not sure which file would be the right one to restore. I'll have to review the material again and see if I can figure it out.
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Cherry
1 year 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
1 year 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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Micaela
11 months ago
C) Do 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).
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Amie
12 months ago
B) Change 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
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Patti
1 year 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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Carolynn
1 year ago
Option D with the three aliases is the most complex, but it does give the most control over the rollout. Gradually shifting traffic is a good idea.
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Shenika
1 year ago
It's important to have a plan in place to easily roll back changes if needed, especially for critical functions like AWS Lambda.
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Ruthann
1 year ago
I agree, having the ability to gradually shift traffic can help in case of errors with the new deployment.
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Fletcher
1 year ago
Option D sounds like a good way to control the rollout and minimize impact on users.
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Alexia
1 year ago
Option C is the simplest, but I'm not sure I like the idea of directly pointing the application back to the previous version. Seems risky.
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Renay
1 year ago
Option B with the 10% traffic split is an interesting approach. Gradually shifting users to the new version is a smart way to test it.
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Billy
1 year ago
Definitely, it allows for a controlled rollout and easy rollback if needed.
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Corrinne
1 year ago
It's a clever way to ensure that any errors can be caught early before affecting all users.
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Lottie
1 year ago
I agree, gradually directing 10% of users to the new version is a smart testing strategy.
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Cary
1 year ago
Option B sounds like a good way to minimize impact on users.
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Jeffrey
1 year ago
I prefer option D. It provides more flexibility by using multiple aliases to manage traffic and rollback if necessary.
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Mignon
1 year ago
I agree with Meghan. Option A minimizes impact on users by using aliases to control traffic flow.
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Meghan
1 year ago
I think option A is the best choice. It allows us to easily switch back to the previous version if needed.
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Evette
1 year 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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Jovita
1 year ago
Having that flexibility is key in case errors occur during deployment.
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Carlee
1 year ago
It definitely minimizes the impact on users, which is important.
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Santos
1 year ago
I agree, using an alias to switch versions is a smart approach.
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Rosalia
1 year ago
Option A seems like a good choice. It allows for easy rollback if needed.
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