An application uses AWS Lambda functions to process images uploaded to S3. During marketing campaigns, thousands of images are uploaded simultaneously, causing the Lambda functions to hit the account concurrency limit and throttle other critical Lambda functions. How can this be prevented?

Answer options:

Configure Provisioned Concurrency for the image processing Lambda function.

Configure Reserved Concurrency for the image processing Lambda function.

Increase the memory allocation for the Lambda function.

Move the image processing to Amazon EC2.

How to approach this question

Identify the need to limit a specific Lambda function from consuming all account concurrency. Reserved Concurrency does this.

Full Answer

B.Configure Reserved Concurrency for the image processing Lambda function.✓ Correct

Configure Reserved Concurrency for the image processing Lambda function.

Reserved concurrency guarantees a specific number of concurrent executions for a function. Crucially, it also acts as a maximum limit. By setting reserved concurrency, you ensure the function cannot scale beyond that limit and consume the unreserved concurrency pool needed by other functions.

Common mistakes

Confusing Provisioned Concurrency (for cold starts) with Reserved Concurrency (for limits/guarantees).

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