Notification of new S3 objects

Question

I have a scenario where we have many clients uploading to s3.

• What is the best approach to knowing that there is a new file?
• Is it realistic/good idea

Answer 1

Push notifications are now built into S3:

http://aws.amazon.com/blogs/aws/s3-event-notification/

You can send notifications to SQS or SNS when an object is created via PUT or POST or a multi-part upload is finished.