Design a Background Task Queue · System Design Interview

Design a Background Task QueueDesign the queue a photo site puts work on when an upload finishes, so the thumbnails are made outside the request that uploaded the file.What it has to do

Accept a task from the upload request and return before it runs

Run every accepted task exactly once, or say why it could not run

A caller can ask whether the work for an upload is finished

Scale

Uploads per day: 40 million

Thumbnail sizes per upload: 4

Out of scope

The image processing itself

The upload path

Serving the finished thumbnails

Billing

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