Amazon S3 Event Notifications: Automating Reactions to S3 Events

Introduction to S3 Event Notifications

Amazon S3 Event Notifications allow you to automatically trigger actions when specific events occur in your S3 bucket. These events include:

• Object Created (e.g., file upload)
• Object Removed (e.g., file deletion)
• Object Restored (e.g., from Glacier)
• Replication Events

You can filter these events, for example, by triggering notifications only for objects with a .jpeg extension.

Use Cases for S3 Event Notifications

S3 Event Notifications enable real-time automation in AWS workflows. Common use cases include:

✅ Generating Thumbnails – Automatically create thumbnails for uploaded images.

✅ Data Processing Pipelines – Trigger Lambda functions to process uploaded files.

✅ Real-time Logging & Monitoring – Stream logs to Amazon Kinesis or Amazon CloudWatch.

✅ Workflow Automation – Send events to Step Functions for further processing.

Event Notification Destinations

S3 can send event notifications to multiple AWS services:

1. Amazon SNS (Simple Notification Service)
   • Sends messages to multiple subscribers (e.g., email, SMS, or another AWS service).
2. Amazon SQS (Simple Queue Service)
   • Enables event-driven message queuing for distributed applications.