System design interview question
"Design YouTube. Creators upload videos of any length and format; viewers watch them anywhere in the world on any device and any connection. 500 hours of video uploaded every minute, 1 billion hours watched per day."
an asynchronous processing pipeline feeding a global delivery network. The two halves are quite different: the upload/transcode path is a batch-processing and workflow problem; the playback path is a CDN, adaptive-bitrate, and caching problem. Strong candidates design them as two systems joined by a queue.
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