Grokking the System Design Interview, Volume II
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Netflix Recommendations: Capacity Estimation

Step 3: Capacity Estimations

Before we fix the design, we estimate the scale. That way we know each part can carry its load.

Summary. The numbers below drive the choices ahead. The diagram lays them out together.

  • User scale. About 200M registered users and 100M daily active users (DAU). This needs horizontal sharding by user ID, that is splitting the data across servers by user.
  • Content catalog. Small, about 100k titles and under a few GB. It can be fully cached in memory or copied to every server.
  • **Data volume

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