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Exam AWS Certified Developer Associate topic 1 question 228 discussion

Exam question from Amazon's AWS Certified Developer Associate

Question #: 228
Topic #: 1

[All AWS Certified Developer Associate Questions]

A company has deployed an application on AWS Elastic Beanstalk. The company has configured the Auto Scaling group that is associated with the Elastic Beanstalk environment to have five Amazon EC2 instances. If the capacity is fewer than four EC2 instances during the deployment, application performance degrades. The company is using the all-at-once deployment policy.

What is the MOST cost-effective way to solve the deployment issue?

A. Change the Auto Scaling group to six desired instances.
B. Change the deployment policy to traffic splitting. Specify an evaluation time of 1 hour.
C. Change the deployment policy to rolling with additional batch. Specify a batch size of 1.
D. Change the deployment policy to rolling. Specify a batch size of 2.

Show Suggested Answer

Suggested Answer: C 🗳️

by k1kavi1 at Nov. 25, 2022, 2:26 p.m.

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hb0011

Highly Voted 2 years, 4 months ago

Selected Answer: C

Option A, increasing the desired instances in the Auto Scaling group to six, would increase the number of running instances and the cost. Option B, using the traffic splitting deployment policy, would increase the complexity of the deployment process and it is not necessary in this case. Option D, using rolling deployment policy, would increase the chance of the performance degradation of the application because it would update 2 instances at a time, and this would reduce the capacity to 3 instances, which would be less than the required 4 instances. The only thing left is C.

upvoted 6 times

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hamimelon

Highly Voted 2 years, 6 months ago

Why not B? You don't even need to add additional batches.

upvoted 5 times

Phinx

2 years, 4 months ago

The question states most cost-effective

upvoted 2 times

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Phinx

2 years, 4 months ago

Traffic-splitting deployments let you perform canary testing as part of your application deployment. In a traffic-splitting deployment, Elastic Beanstalk launches a full set of new instances just like during an immutable deployment. It then forwards a specified percentage of incoming client traffic to the new application version for a specified evaluation period. If the new instances stay healthy, Elastic Beanstalk forwards all traffic to them and terminates the old ones. If the new instances don't pass health checks, or if you choose to abort the deployment, Elastic Beanstalk moves traffic back to the old instances and terminates the new ones. There's never any service interruption. For details, see How traffic-splitting deployments work.

upvoted 2 times

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rcaliandro

Most Recent 1 year, 11 months ago

Selected Answer: C

For me is C. Rolling with additional step with size = 1 is cost-effective since we only run one more instance during the deployment and we have to be carefull to don't go below 4

upvoted 1 times

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pancman

2 years, 3 months ago

Selected Answer: C

The answer is C. While the rolling deployment is being performed, since the batch size is 1, there will always be at least 4 functional EC2 instances throughout. So there won't be any performance issues during the deployment

upvoted 1 times

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sichilam

2 years, 4 months ago

C is the most correct one

upvoted 1 times

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Phinx

2 years, 4 months ago

Selected Answer: C

I'll go for C. B is not cost-effective. Traffic-splitting will deploy new set of instances same with immutable. https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html

upvoted 1 times

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BobAWS23

2 years, 4 months ago

Selected Answer: B

B because of cost

upvoted 1 times

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Nosal

2 years, 5 months ago

Selected Answer: C

I'll go for C

upvoted 1 times

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k1kavi1

2 years, 6 months ago

Selected Answer: C

Going with C

upvoted 2 times

k1kavi1

2 years, 6 months ago

Or is it B because of cost effectiveness ?

upvoted 2 times

by116549

2 years, 5 months ago

Hi, if that were the case will traffic splitting not more expensive? https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.rolling-version-deploy.html Traffic-splitting deployments let you perform canary testing as part of your application deployment. In a traffic-splitting deployment, Elastic Beanstalk launches a full set of new instances just like during an immutable deployment. It then forwards a specified percentage of incoming client traffic to the new application version for a specified evaluation period. If the new instances stay healthy, Elastic Beanstalk forwards all traffic to them and terminates the old ones. If the new instances don't pass health checks, or if you choose to abort the deployment, Elastic Beanstalk moves traffic back to the old instances and terminates the new ones. There's never any service interruption.

upvoted 1 times

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