Domain 2.1: Scalable Architectures — AWS SAA-C03 Practice Question 24

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Identify the bottlenecks in a serverless stack: Lambda concurrency limits and DynamoDB capacity limits.

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In a serverless stack, 429 (Too Many Requests) errors usually indicate API Gateway or Lambda throttling. Lambda has a default concurrency limit of 1,000, which needs a quota increase for 10,000 rps. 503 errors often indicate backend timeouts or failures, which can happen if DynamoDB throttles the Lambda function due to insufficient capacity.

Common mistakes

Thinking increasing Lambda memory solves concurrency issues.

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Common mistakes

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