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Introducing Amazon S3 Object Lambda – Use Your Code to Process Data as It Is Being Retrieved from S3 | AWS News Blog

aws.amazon.com/blogs/aws/introducing-amazon-s3-object-lambda-use-your-code-to-process-data-as-it-is-being-retrieved-from-s3

What Jamie wrote

Interesting new AWS capability to modify data as it is accessed in S3. These could be useful to keep data duplication down. It would seem critical that you make these Lamba methods as fast and dependency-free as possible.