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An order-processing service consumes messages from an Amazon SQS Standard queue using a custom worker. During traffic spikes, the worker occasionally times out after performing some work but before acknowledging the message, so SQS redelivers it and it may be processed again. You also observe that a small set of “poison” messages always fail validation. What change most directly improves resilience by (1) preventing poison messages from retrying indefinitely and (2) avoiding duplicate side effects caused by legitimate retries?
Option C is correct because a dead-letter queue (DLQ) with a maxReceiveCount redrive policy directly addresses the poison message problem by moving messages that repeatedly fail validation out of the main queue after a set number of retries, preventing indefinite retries. Impleme…Read full explanation
A Lambda function behind API Gateway has predictable traffic spikes every hour. The function does not need access to resources in a VPC, and p95 latency spikes are caused by cold starts during scale-out. Which two actions are most effective? Select two.
Option A is correct because provisioned concurrency pre-warms a specified number of Lambda execution environments, eliminating cold starts for those instances. This directly addresses the p95 latency spikes caused by cold starts during predictable traffic spikes, as the function …Read full explanation
A Lambda function needs to read the current value of exactly one AWS Secrets Manager secret at startup. Which least-privilege IAM permission (action and resource scope) should you grant to the Lambda execution role?
The Lambda function needs to read the current value of exactly one secret at startup. The least-privilege permission is `secretsmanager:GetSecretValue` scoped to that secret's full ARN. This action retrieves the secret value, and restricting the resource to the specific ARN ensur…Read full explanation
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