What does "idempotency" mean in the context of API design, and why is it important for services like AWS Lambda?
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Incorrect.
The correct answer is A) An idempotent operation produces the same result no matter how many times it runs; this matters because retries (e.g. from network errors or at-least-once delivery) shouldn't cause unintended side effects like duplicate processing
Correct Answer
An idempotent operation produces the same result no matter how many times it runs; this matters because retries (e.g. from network errors or at-least-once delivery) shouldn't cause unintended side effects like duplicate processing
Because some AWS services (like SQS or certain event sources) may deliver events more than once, designing Lambda functions to be idempotent ensures repeated processing of the same event doesn't cause issues like duplicate charges or records.