DVA-C02 Question #286: Real Exam Question with Answer & Explanation

Question

An Amazon Simple Queue Service (Amazon SQS) queue serves as an event source for an AWS Lambda function. In the SQS queue, each item corresponds to a video file that the Lambda function must convert to a smaller resolution. The Lambda function is timing out on longer video files, but the Lambda function's timeout is already configured to its maximum value. What should a developer do to avoid the timeouts without additional code changes?

Options

• AIncrease the memory configuration of the Lambda function.
• BIncrease the visibility timeout on the SQS queue.
• CIncrease the instance size of the host that runs the Lambda function.
• DUse multi-threading for the conversion.

Explanation

In Lambda, memory allocation directly controls CPU power; increasing memory gives the function proportionally more CPU cycles, allowing it to process long video files faster and avoid timeouts.

Common mistakes.

• B. Increasing the SQS visibility timeout prevents a message from being redelivered to another consumer while in flight, but it does not make the Lambda function run faster or prevent it from timing out during processing.
• C. Lambda is a managed serverless service; developers cannot choose or configure the underlying host instance size — this is controlled entirely by the memory configuration setting.
• D. Adding multi-threading requires code changes, which the question explicitly prohibits as a solution path.

Concept tested. Lambda memory-to-CPU ratio for compute-intensive workload optimization

Reference. https://docs.aws.amazon.com/lambda/latest/dg/configuration-memory.html

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