I am trying to build a Lambda function that gets triggered on S3 delete events. If multiple items are deleted at once, I want to use an S3 batch job. What I can't figure out or find in the documentation is what an event like that would look like. I'd assume it would just have multiple similar items in Records and I could iterate through, get all the keys, and then batch delete, but I can't confirm that. I've searched the documentation, and I built a test Lambda that would just log the event, but that came through as multiple distinct events. I'm stumped as to how to do what I'm trying here.

CodePudding user response：

The s3 event you need to subscribe to is s3:ObjectRemoved:Delete that by documentation is used to track an object or a batch of objects being removed:

By using the ObjectRemoved event types, you can enable notification when an object or a batch of objects is removed from a bucket.

You can expect an event structured as detailed here.

However since in the comment you said you just wanted to "copy the objects pre-delete to another bucket" you may want to explore S3 buckets versioning capabilities. Enabling versioning will allow you to preserve in a "deleted" state the objects, leaving room for future restores, as per delete workflow here.