Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 124 discussion

Cant be implemented on Lambda because the timeout for Lambda is 15mins and the Job takes 60minutes to complete Answer >> A

spot instances

Spot is a bad choice because process takes up to 60 mins and instances can be down at any time

Ec2 by themselves are not "scalable" unless they are under an autoscaling group.The question also says that the job can be started and stopped with no negative impact.So even if the execution time of 15mins runs out, it can be started again to complete the 60 mins job. Hence my answer is D

A is the correct answer, we can't use lambda because it's limit is 15 mins.

There is a chance of interrupting the jobs, but as they can be started and stopped at any given time, the MOST COST effective is going for Spot.

Spot Instances provide significant cost savings for flexible start and stop batch jobs. Purchasing Reserved Instances (B) is better for stable workloads, not dynamic ones. On-Demand Instances (C) are costly and lack potential cost savings like Spot Instances. AWS Lambda (D) is not suitable for long-running batch jobs.

key: can be started and stopped at any given time with no negative impact

Spot can do that

The key reasons are: Spot can provide significant cost savings (up to 90%) compared to On-Demand. Since the job is stateless and can be stopped/restarted anytime, the intermittent availability of Spot is not an issue. Spot supports the same instance types as On-Demand, so optimal instance types can be chosen. For a 60+ minute batch job, the chance of Spot interruption is low. But if it happens, the job can just be restarted. Reserved Instances don't offer any advantage for a highly dynamic job like this. Lambda is not a good fit given the long runtime requirement.

Spot Instances provide significant cost savings for flexible start and stop batch jobs. Purchasing Reserved Instances (B) is better for stable workloads, not dynamic ones. On-Demand Instances (C) are costly and lack potential cost savings like Spot Instances. AWS Lambda (D) is not suitable for long-running batch jobs.

A is correct

Answer A: typically takes upwards of 60 minutes total to complete.

The correct answer is Option A. To design a scalable and cost-effective solution for the batch processing job, the solutions architect should recommend implementing EC2 Spot Instances. EC2 Spot Instances allow users to bid on spare Amazon EC2 computing capacity and can be a cost-effective solution for stateless, interruptible workloads that can be started and stopped at any time. Since the batch processing job is stateless, can be started and stopped at any time, and typically takes upwards of 60 minutes to complete, EC2 Spot Instances would be a good fit for this workload.

Spot Instances should be good enough and cost effective because the job can be started and stopped at any given time with no negative impact.

Option A

A is correct