DVA-C02 Question 323
Select 4You are a developer troubleshooting a performance issue in an AWS Lambda function that processes data from an Amazon S3 bucket. The function is taking significantly longer to execute than expected. Upon investigation, you find that the issue occurs intermittently when the Lambda function tries to retrieve objects from the S3 bucket. Which of the following steps will help you identify the root cause of the issue?
- A
Enable Amazon S3 server access logging and review the logs for anomalies in object retrieval requests.
- B
Use AWS X-Ray to trace the Lambda function execution and identify performance bottlenecks.
- C
Increase the memory allocation of the Lambda function to reduce execution time.
- D
Verify the S3 bucket's permissions to ensure the Lambda function has the correct access.
- E
Check the Amazon CloudWatch Logs for the Lambda function to identify any error messages or throttling issues.
Show answer and explanation
Correct answers: A, B, D, E
Explanation
To identify the root cause of the performance issue, you need to gather diagnostic data and investigate potential areas of failure. Enabling S3 server access logging and checking CloudWatch Logs help identify issues with S3 access and Lambda execution errors. Using AWS X-Ray can trace the execution of the Lambda function to pinpoint bottlenecks. Verifying permissions ensures the Lambda function can reliably access the S3 bucket. Increasing Lambda memory allocation is not a diagnostic step and does not address the underlying cause of the issue.
- A. Correct.
Enabling Amazon S3 server access logging can provide detailed information about object retrieval requests, which can reveal anomalies such as delays or errors in accessing objects.
- B. Correct.
AWS X-Ray allows you to trace the execution of the Lambda function and pinpoint performance bottlenecks, such as delays caused by external calls to S3.
- C. Incorrect.
Increasing memory allocation can improve performance, but it does not help identify the root cause of the issue. This is a reactive measure, not a diagnostic step.
- D. Correct.
Verifying the S3 bucket's permissions ensures that the Lambda function has the necessary access, as permission issues can cause intermittent failures.
- E. Correct.
Amazon CloudWatch Logs can provide insights into the Lambda function's execution, including error messages or throttling issues that might be causing performance problems.