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What happens when an AWS Lambda function reaches its reserved concurrency limit?

easy📝 Conceptual Q1 of 15
AWS - Lambda
What happens when an AWS Lambda function reaches its reserved concurrency limit?
AThe function scales down to reduce resource usage.
BAdditional invocation requests are throttled and receive a throttling error.
CThe function queues the extra requests until capacity is available.
DLambda automatically increases concurrency to handle more requests.
Step-by-Step Solution
Solution:

  1. Step 1: Understand reserved concurrency behavior

    Reserved concurrency sets a fixed limit on how many instances of a Lambda function can run simultaneously.

  2. Step 2: Identify what happens when limit is reached

    If the limit is reached, new invocation requests are throttled and receive an error response.

  3. Final Answer:

    Additional invocation requests are throttled and receive a throttling error. -> Option B

  4. Quick Check:

    Reserved concurrency limit reached = Throttling [OK]
Quick Trick: Reserved concurrency caps running instances, excess calls get throttled [OK]
Common Mistakes:
MISTAKES
  • Thinking Lambda auto-scales beyond reserved concurrency
  • Assuming requests queue instead of throttling
  • Believing function scales down automatically

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