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Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 98 discussion

Exam question from Amazon's AWS Certified Developer - Associate DVA-C02
Question #: 98
Topic #: 1
[All AWS Certified Developer - Associate DVA-C02 Questions]

A developer is creating an AWS Lambda function in VPC mode. An Amazon S3 event will invoke the Lambda function when an object is uploaded into an S3 bucket. The Lambda function will process the object and produce some analytic results that will be recorded into a file. Each processed object will also generate a log entry that will be recorded into a file.

Other Lambda functions, AWS services, and on-premises resources must have access to the result files and log file. Each log entry must also be appended to the same shared log file. The developer needs a solution that can share files and append results into an existing file.

Which solution should the developer use to meet these requirements?

  • A. Create an Amazon Elastic File System (Amazon EFS) file system. Mount the EFS file system in Lambda. Store the result files and log file in the mount point. Append the log entries to the log file.
  • B. Create an Amazon Elastic Block Store (Amazon EBS) Multi-Attach enabled volume. Attach the EBS volume to all Lambda functions. Update the Lambda function code to download the log file, append the log entries, and upload the modified log file to Amazon EBS.
  • C. Create a reference to the /tmp local directory. Store the result files and log file by using the directory reference. Append the log entry to the log file.
  • D. Create a reference to the /opt storage directory. Store the result files and log file by using the directory reference. Append the log entry to the log file.
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Suggested Answer: A 🗳️
by loctong at May 18, 2023, 1:50 p.m.
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Dushank
Highly Voted 1 year, 7 months ago
Selected Answer: A
The requirement is to have a shared file system that allows for appending to files and can be accessed by multiple Lambda functions, AWS services, and on-premises resources. Amazon Elastic File System (Amazon EFS) is a good fit for these requirements. EFS provides a scalable and elastic NFS file system which can be mounted to multiple EC2 instances and Lambda functions at the same time, making it easier for these resources to share files. You can also append to existing files on an EFS file system, which meets the requirement for a shared log file that can have new entries appended to it.
upvoted 9 times
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sumanshu
Most Recent 4 months ago
Selected Answer: A
B) Eliminated - Amazon Elastic Block Store (EBS) volumes are designed for single-instance use or Multi-Attach for specific EC2 instances, not for Lambda functions or serverless environments. C) Eliminated - The /tmp directory in Lambda is ephemeral storage that exists only for the duration of the Lambda invocation. It is not shared between functions or persistent across invocations D) Eliminated - The /opt directory in Lambda is used for deploying custom runtimes or external libraries. It is read-only during execution, so it cannot be used to store or update files.
upvoted 1 times
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Saudis
7 months, 2 weeks ago
Selected Answer: A
Elastic File System file shareing
upvoted 1 times
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65703c1
11 months, 1 week ago
Selected Answer: A
A is the correct answer.
upvoted 1 times
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mgonblan
1 year, 10 months ago
A) There are several references for this: https://docs.aws.amazon.com/lambda/latest/operatorguide/networking-vpc.html and this blog entry: https://aws.amazon.com/es/blogs/compute/choosing-between-aws-lambda-data-storage-options-in-web-apps/
upvoted 1 times
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delak
1 year, 11 months ago
Selected Answer: A
shared files == EFS
upvoted 3 times
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loctong
1 year, 11 months ago
Selected Answer: A
EFS is true
upvoted 2 times
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