Grokking the System Design Interview, Volume II
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Step 7: Detailed Component Design

Priya mostly watches crime dramas, and last month she finished one documentary series. Tonight she opens Netflix on her TV, finishes the first season of a Korean thriller, a genre she has never tried, and gives it a thumbs-up from her phone. When she returns to the home page, she expects rows that already reflect that.

The home page has about 200 ms to respond, and scoring the catalog for one user takes far longer than that. Every model in this design therefore runs before Priya arrives or shortly after she acts, never while she waits. Her evening raises four questions:

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