DVA-C02 Question 318
Select 3A developer has deployed an AWS Lambda function that processes data from an Amazon S3 bucket. The function intermittently fails with a TimeoutError, and the developer notices that the function execution occasionally exceeds the default timeout of 3 seconds. What steps should the developer take to resolve this issue?
- A
Increase the Lambda function timeout value to accommodate longer processing times.
- B
Enable Amazon S3 Event Notifications to ensure the Lambda function is invoked more reliably.
- C
Use Amazon CloudWatch Logs to analyze the function's execution and identify which specific operations are taking the longest time.
- D
Optimize the Lambda function code to reduce processing time by using more efficient algorithms or libraries.
- E
Add a retry mechanism within the Lambda function to handle temporary issues and avoid failures.
Show answer and explanation
Correct answers: A, C, D
Explanation
Timeout errors in AWS Lambda can occur when the function's execution time exceeds its configured timeout. To address this, the developer should first increase the timeout value to accommodate longer processing times. Analyzing the function's execution using Amazon CloudWatch Logs can help identify which parts of the code need optimization. By improving the code efficiency, the developer can reduce execution time and prevent future timeouts, ensuring smoother operation of the Lambda function.
- A. Correct.
Correct. Increasing the Lambda function timeout value can prevent the function from timing out if the processing time occasionally exceeds the default limit.
- B. Incorrect.
Incorrect. While Amazon S3 Event Notifications help trigger the Lambda function, they do not address the issue of the function hitting a timeout.
- C. Correct.
Correct. Using Amazon CloudWatch Logs to analyze execution times can help the developer identify the root cause of the timeout issue and optimize the function accordingly.
- D. Correct.
Correct. Optimizing the Lambda function code can reduce execution time and prevent timeouts, making the function more efficient.
- E. Incorrect.
Incorrect. Adding a retry mechanism within the function itself is not a best practice for handling timeouts. AWS retries the invocation automatically in case of failures, and handling retries within the function could compound the problem.