Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 161 discussion

B: Rolling with additional batch , considering "minimize the cost of additional resources" C costly than B, due to double capacity

D. Immutable The immutable method strikes a balance between maintaining service availability and controlling costs. It avoids the downtime associated with the all-at-once method and doesn't require the more extensive resource duplication of the blue/green method. While it does temporarily increase resource usage (similar to rolling with an additional batch), it's generally more efficient and less risky than updating instances in-place.

Rolling deployments reuse existing instances for a portion of the deployment time. While new instances are launched, old ones continue to serve traffic. This minimizes idle compute time and reduces costs.

D is the correct answer.

Ans-B: The immutable deployment method updates an application by launching new instances with the new version in a new Auto Scaling group, alongside the existing instances running the old version. This ensures that the application maintains full capacity during the deployment because the existing environment is unaffected until the new environment is fully deployed and verified. Once the deployment is successful, traffic is shifted to the new instances, and the old ones are terminated. This minimizes downtime and provides a quick rollback if needed. The cost of additional resources is limited to the duration of the deployment, after which the old resources are terminated.

https://docs.aws.amazon.com/whitepapers/latest/practicing-continuous-integration-continuous-delivery/deployment-methods.html#:~:text=During%20the%20deployment%20process%20two%20software%20versions%2C%20new%20and%20old%2C%20are%20running%20on%20the%20same%20fleet.%20This%20method%20allows%20a%20zero%2Ddowntime%20update.%20If%20the%20deployment%20fails%2C%20only%20the%20updated%20portion%20of%20the%20fleet%20will%20be%20affected. It does not need a new instance

This method performs updates by launching a new set of instances in a new Auto Scaling group. Once the new instances pass health checks, they are moved into the existing Auto Scaling group, and the old instances are terminated. This method ensures full capacity, avoids downtime, and minimizes additional costs because it does not double the environment's running resources for an extended period. It adds resources temporarily and only in the amount necessary to maintain capacity.

Shoulc be B "Ultimately, the choice between "Rolling with additional batch" and "Blue/green" deployments should depend on your specific requirements and constraints. If maintaining full capacity is a crucial factor, then "Rolling with additional batch" could be the better choice."

MS Bing answer: B vs Chag GPT answer: C Your choice?

C and D are wrong, since they both require additional resources.

chat gpt replied

Answer is B One of requirement - the developer [must minimize the cost of additional resources] that support the deployment.

I vote for D since the requirement is to minimize the costs of resources. Blue/green is a good and safe way to solve this but it costs more resources than an Immutable rollout. Immutable: Launches a new set of instances in a new temporary environment to ensure that the new version works as expected. Once the new version is verified, traffic is rerouted to the new set of instances, and the old instances are terminated. This method maintains full capacity, avoids service interruptions, and minimizes the cost compared to blue/green deployments since the overlap in running resources is shorter.

The correct answer is (C). The blue/green deployment method is the best option to meet the developer's requirements. Blue/green allows the developer to deploy a new version of the application without service interruption. This is done by creating a blue production environment and a green production environment. The blue environment is the current production environment and the green environment is the new version of the application. The developer can then test the new version of the application in the green environment before putting it into production.