Design YouTube Video Delivery · System Design Interview

Design YouTube Video DeliveryDesign only the delivery half of a video platform at YouTube’s size: how the bytes of an already-transcoded video reach a player anywhere in the world, cheaply and without stalling. Scalability, availability and cost are the whole exercise.What it has to do

A player fetches a video’s segments and plays them without stalling

The same video is served to viewers on every continent

A video that suddenly becomes popular is still served

Scale

Hours watched per day: 1 billion

Videos in the library: 15 billion

Peak egress: 200 Tbps

Out of scope

Upload and transcoding

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