AWS Certified Data Engineer Associate DEA-C01 Practice Question
Every night at 02:00 UTC a third-party exposes a new daily_sales.csv file through its REST API. You need a serverless ingestion pipeline that automatically downloads the file to Amazon S3 at that time with minimal ongoing administration. Which solution satisfies these requirements?
Create an Amazon EventBridge rule with a 02:00 UTC cron expression that invokes an AWS Lambda function to call the vendor API and write the file to Amazon S3.
Launch an Amazon EC2 instance and configure a Linux cron job at 02:00 UTC to download the file to S3 using the AWS CLI.
Configure an Amazon S3 event notification that triggers a Lambda function to fetch the file from the vendor API when a new object appears in the destination bucket.
Deploy Amazon MWAA and schedule an hourly DAG that checks the vendor endpoint, downloads the file when available, and stores it in S3.
An Amazon EventBridge rule with a cron expression is a fully managed, serverless scheduler that can invoke AWS targets such as Lambda on a precise timetable without requiring infrastructure management. Invoking a Lambda function keeps the solution serverless while allowing the code to call the vendor's API and place the object in S3. Running a cron job on EC2 adds operational overhead and is not serverless. S3 event notifications cannot fire until an object is already in the bucket, so they cannot start the download. Amazon MWAA is managed but still requires environment provisioning, version upgrades, and incurs higher cost and complexity compared with a simple EventBridge rule.
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AWS Certified Data Engineer Associate DEA-C01
Data Ingestion and Transformation
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