Exam AWS DevOps Engineer Professional topic 1 question 8 discussion

Exam question from Amazon's AWS DevOps Engineer Professional

Question #: 8
Topic #: 1

[All AWS DevOps Engineer Professional Questions]

A company has developed an AWS Lambda function that handles orders received through an API. The company is using AWS CodeDeploy to deploy the Lambda function as the final stage of a CI/CD pipeline.
A DevOps Engineer has noticed there are intermittent failures of the ordering API for a few seconds after deployment. After some investigation, the DevOps
Engineer believes the failures are due to database changes not having fully propagated before the Lambda function begins executing.
How should the DevOps Engineer overcome this?

A. Add a BeforeAllowTraffic hook to the AppSpec file that tests and waits for any necessary database changes before traffic can flow to the new version of the Lambda function
B. Add an AfterAllowTraffic hook to the AppSpec file that forces traffic to wait for any pending database changes before allowing the new version of the Lambda function to respond
C. Add a BeforeInstall hook to the AppSpec file that tests and waits for any necessary database changes before deploying the new version of the Lambda function
D. Add a ValidateService hook to the AppSpec file that inspects incoming traffic and rejects the payload if dependent services, such as the database, are not yet ready

Show Suggested Answer

Suggested Answer: A 🗳️

by otsu at April 9, 2020, 5:39 p.m.

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otsu

Highly Voted 3 years, 8 months ago

should be A https://docs.aws.amazon.com/codedeploy/latest/userguide/reference-appspec-file-structure-hooks.html#appspec-hooks-lambda

upvoted 14 times

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xlFireman

Highly Voted 3 years, 7 months ago

A - Correct B - Does not fit into the frame of the question. We want the database to be up and running BEFORE we start serving production traffic. C - Not applicable in the appspec.yml file for Lambda D - Same explanation as C

upvoted 9 times

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xhi158

Most Recent 1 year, 6 months ago

To overcome the issue of intermittent failures of the ordering API for a few seconds after deployment, the DevOps Engineer should add a BeforeAllowTraffic hook to the AppSpec file that tests and waits for any necessary database changes before traffic can flow to the new version of the Lambda function 1. This will ensure that the database changes have fully propagated before the Lambda function begins executing. So the answer is A

upvoted 2 times

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