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AWS Certified Solutions Architect study material · question 416 of 500

A function with 400 reserved concurrency hits that ceiling while the account has spare capacity elsewhere. What happens?

  1. The function throttles, because it cannot use concurrency outside its reservation
  2. The function borrows from the unreserved pool
  3. The reservation is raised automatically
  4. Requests are redirected to another Region
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Answer: A. The function throttles, because it cannot use concurrency outside its reservation

Reserved concurrency is a hard ceiling as well as a guarantee, so the function throttles even while concurrency sits idle elsewhere.

Source: Understanding Lambda function scaling (Amazon Web Services) — Reserved concurrency

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