Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 91 discussion

Exam question from Amazon's AWS Certified DevOps Engineer - Professional DOP-C02

Question #: 91
Topic #: 1

[All AWS Certified DevOps Engineer - Professional DOP-C02 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 is invoked.

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 devnv at May 14, 2023, 10:22 a.m.

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Gomer

Highly Voted 1 year ago

Selected Answer: A

In my research, there are only TWO CodeDeploy AppSpec ifecycle event hooks for Lambda deployment: BeforeAllowTraffic # Use to run tasks before traffic is shifted to the deployed Lambda function version. AfterAllowTraffic # Use to run tasks after all traffic is shifted to the deployed Lambda function version. A: (YES) Don't redirect traffic untill ready B: (NO) Block traffic until ready C: (NO) Event hook N/A for Lambda D: (NO) Event hook N/A for Lambda

upvoted 5 times

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thanhnv142

Highly Voted 1 year, 5 months ago

A is correct: <using AWS CodeDeploy to deploy> and <a CI/CD pipeline> means lifecycle event hook B: AfterAllowTraffic wont solve the problem, we need to hook before traffic is allowed, as in <not having fully propagated before the Lambda function is invoked> C: beforeInstall is used to prepare for the installation process, so it is not relevant D: there is no ValidateService hook

upvoted 5 times

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seetpt

Most Recent 1 year, 2 months ago

Selected Answer: A

I think A

upvoted 1 times

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jojom19980

1 year, 4 months ago

Selected Answer: A

D can be correct if there is a wait to database to be ready so I will go with A

upvoted 3 times

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habros

1 year, 12 months ago

"Hooks": [ { "BeforeInstall": "BeforeInstallHookFunctionName" }, { "AfterInstall": "AfterInstallHookFunctionName" }, { "AfterAllowTestTraffic": "AfterAllowTestTrafficHookFunctionName" }, { "BeforeAllowTraffic": "BeforeAllowTrafficHookFunctionName" }, { "AfterAllowTraffic": "AfterAllowTrafficHookFunctionName" } ] }

upvoted 3 times