Lambda

Part of the MediaBridge series. Why Thumbnails in Lambda Thumbnail generation on the backend server would mean every file upload triggers a download from S3, a resize operation, and an upload back to S3 - all inline with the upload flow. That adds latency to every upload, burns bandwidth on the server, and blocks the upload response until the thumbnail is ready. Lambda is a better fit. S3 fires an event for every object creation. The Lambda processes it asynchronously, after the upload has already completed and the user has their presigned URL. The backend is not involved. ...

Part of the MediaBridge series. The Problem S3 Glacier and Glacier Deep Archive are cheap cold storage tiers. Files in Glacier take 3-5 hours to restore. Files in Deep Archive take up to 12 hours. When a user tries to access an archived file, S3 returns a 403 (or the object is simply missing from the listing depending on how the bucket is configured). The user gets no feedback about what happened or when the file will be available. ...