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AWS Certified Solutions Architect study material · question 414 of 500

A critical function has no reserved concurrency and the account's pool is exhausted by other functions. What happens to it?

  1. Its invocations are queued until capacity frees up
  2. AWS raises the account quota automatically
  3. It is throttled and starts dropping requests
  4. It borrows concurrency reserved by other functions
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Answer: C. It is throttled and starts dropping requests

Functions without reserved concurrency share the on-demand pool and throttle once it runs out, which is exactly what reserving concurrency prevents.

Source: Understanding Lambda function scaling (Amazon Web Services) — Understanding reserved and provisioned concurrency

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