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How a single SQS queue consumer can silently throttle your entire AWS account

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A software developer investigating AWS Lambda concurrency risks found that a single SQS queue consumer can exhaust an entire account's concurrency pool within minutes. By default, AWS Lambda allows up to 1,000 concurrent executions per region, and a queue-backed function can scale to 1,250 concurrent instances, consuming all unreserved capacity and throttling unrelated functions. A second failure mode occurs when each Lambda execution environment opens a database connection, potentially overwhelming a Postgres instance with far more connections than it can handle. Neither issue is visible in application code — both stem from function configuration and event source mapping settings that live outside the codebase. The developer notes that AI coding assistants can correctly generate handler logic but cannot account for these infrastructure-level constraints, which are absent from the repository.

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How a single SQS queue consumer can silently throttle your entire AWS account · ShortSingh