24. AWS S3 Event Notification → Lambda Trigger → Auto File Copy Between Buckets

Code used : https://github.com/bedwalsanjay/aws-data-engineering/blob/main/s3_event_notification_copy_lambda.md

In this video, we will build a real-world AWS automation where an S3 event notification triggers a Lambda function to automatically copy files from one S3 bucket to another.

This is a very common data engineering and cloud automation use case, especially for building event-driven pipelines.

🔹 What you will learn in this video:

* What are S3 Event Notifications
* How S3 triggers AWS Lambda automatically
* Step-by-step setup of S3 → Lambda integration
* Writing Lambda function to copy objects between buckets
* Required IAM roles and permissions
* Testing the complete workflow in real time

🔹 Use Cases Covered:

* Automated data ingestion pipelines
* Backup and replication between S3 buckets
* Real-time file processing
* Data lake architecture (bronze → silver layer movement)

🔹 Architecture Explained:
Whenever a file is uploaded to the source S3 bucket, an event notification is generated. This event triggers a Lambda function, which reads the file metadata and copies the file to the destination bucket automatically.

This eliminates manual effort and enables scalable, event-driven data processing.

🔹 Tech Stack:

* Amazon S3
* AWS Lambda
* IAM Roles & Policies
* Python (Boto3)

This tutorial is perfect for beginners as well as data engineers who want to understand how event-driven architectures work in AWS.

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Видео 24. AWS S3 Event Notification → Lambda Trigger → Auto File Copy Between Buckets канала SanjayBedwal