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Exam AWS Certified Solutions Architect - Professional topic 1 question 517 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 517
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

A company receives clickstream data files to Amazon S3 every five minutes. A Python script runs as a cron job once a day on an Amazon EC2 instance to process each file and load it into a database hosted on Amazon RDS. The cron job takes 15 to 30 minutes to process 24 hours of data. The data consumers ask for the data be available as soon as possible.
Which solution would accomplish the desired outcome?

A. Increase the size of the instance to speed up processing and update the schedule to run once an hour.
B. Convert the cron job to an AWS Lambda function and trigger this new function using a cron job on an EC2 instance.
C. Convert the cron job to an AWS Lambda function and schedule it to run once an hour using Amazon CloudWatch Events.
D. Create an AWS Lambda function that runs when a file is delivered to Amazon S3 using S3 event notifications.

Show Suggested Answer

Suggested Answer: D 🗳️
Reference:
https://docs.aws.amazon.com/lambda/latest/dg/with-s3.html

by donathon at Sept. 11, 2019, 8:41 a.m.

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Comments

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donathon

Highly Voted 3 years, 8 months ago

D A: Will not help. B: Not feasible since it is based on a schedule not event. C: This is still based on schedule.

upvoted 28 times

donathon

3 years, 8 months ago

https://docs.aws.amazon.com/lambda/latest/dg/with-s3.html

upvoted 2 times

PacoDerek

3 years, 8 months ago

C as s3 event may lost. cloudwatch event is more reliable. using rate expression to trigger Lambda is ok

upvoted 1 times

PacoDerek

3 years, 8 months ago

https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html

upvoted 2 times

LunchTime

3 years, 7 months ago

D is the correct answer. If S3 event notifications are configured property, this will not be an issue, as explained in the following link: https://aws.amazon.com/premiumsupport/knowledge-center/lambda-configure-s3-event-notification/

upvoted 1 times

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pixepe

2 years, 8 months ago

C (hourly schedule) is INCORRECT as requirement is "The data consumers ask for the data be available as soon as possible." D is correct

upvoted 1 times

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shammous

3 years, 7 months ago

D is the answer, but I disagree with you regarding CW Event being "still based on schedule". It can do the same job as S3 events by instantaneously triggering a lambda function based on a write event on S3, but the fact that it should be "as soon as possible" make S3 events service a better choice as it will perform quicker than CW Event.

upvoted 3 times

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uopspop

Highly Voted 3 years, 8 months ago

prefer D, too. C is still hour-based, which is not "as soon as possible".

upvoted 9 times

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SkyZeroZx

Most Recent 1 year, 11 months ago

3 years, 7 months ago

D is correct

upvoted 1 times

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