Understanding S3 Object Lambda

In this lesson, we explored S3 Object Lambda, a powerful feature that allows on-the-fly modification of S3 objects as they are retrieved—without duplicating data across multiple buckets.

1. What is S3 Object Lambda?

📌 S3 Object Lambda enables dynamic transformation of S3 objects when accessed through an S3 Access Point. Instead of storing multiple versions of the same object in different buckets, a Lambda function processes and modifies the object at retrieval time.

Key Benefits

✅ No need to duplicate objects or buckets

✅ Data is transformed dynamically at access time

✅ Use AWS Lambda to modify, redact, or enrich data on-the-fly

2. How Does S3 Object Lambda Work?

1️⃣ Original Data is stored in an S3 bucket.

2️⃣ S3 Access Point provides controlled access to the bucket.

3️⃣ Lambda Function processes the data when an object is requested.

4️⃣ The transformed object is returned to the application.

3. Use Case Example: E-Commerce & Analytics

Imagine an e-commerce company storing raw customer data in an S3 bucket.

• The E-commerce application retrieves the original data directly from the S3 bucket.
• The Analytics application, however, needs redacted customer data (without personal information).