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AWS Certified Solutions Architect Professional SAP-C02 Practice Question

Your company runs a batch-processing service on Amazon EC2 instances that are managed by an Auto Scaling group (ASG) spanning two Availability Zones. Each worker instance polls an Amazon SQS queue and may process a single job for up to 25 minutes. The operations team has several reliability requirements. First, when the average CPU utilization of the ASG rises above 70 percent for two consecutive 1-minute periods, new instances must start launching within 90 seconds to prevent the queue backlog from growing. Second, after an instance has begun processing a job, the ASG must allow up to 30 minutes for that instance to finish before it can be terminated by a scale-in event. Finally, the scaling configuration should require minimal ongoing manual tuning as traffic patterns change.

Which combination of actions will meet these requirements?

  • Enable detailed monitoring on the ASG. Create a target tracking scaling policy that maintains 70 percent average CPU utilization and sets Instance warm-up = 90 seconds. Add an EC2 Auto Scaling lifecycle hook on the autoscaling:EC2_INSTANCE_TERMINATING transition with a 1,800-second heartbeat timeout; have each instance call CompleteLifecycleAction when its current job finishes.

  • Create a step scaling policy that adds instances when CPU exceeds 70 percent. Set EstimatedInstanceWarmup = 90 seconds and configure the ASG's default cooldown to 1,800 seconds. Do not use lifecycle hooks.

  • Turn on instance scale-in protection for all new instances at launch. Use a scheduled AWS Lambda function to remove protection after 30 minutes. Configure a simple scaling policy that launches two instances when CPU exceeds 70 percent with the default 300-second cooldown.

  • Enable predictive scaling on the ASG to forecast capacity needs. Add a target tracking policy but disable scale-in for 30 minutes after every scale-out event. Rely on an alarm that tracks the SQS queue depth to trigger additional scale-out if necessary.

AWS Certified Solutions Architect Professional SAP-C02
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