Grokking the System Design Interview, Volume II
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Step 3: Capacity Estimation

The numbers below lead to three conclusions. The write rate is modest, the read rate is roughly ten times larger, and storage grows every day because old events are rarely deleted. Each conclusion drives a later design choice.

Summary:

  • About 100 million users, with 10 to 20 million active each day.
  • Up to 50 million new events a day as a planning ceiling: about 600 writes per second on average and 2,000 to 5,000 at peak.
  • About 100 to 200 million reads a day, roughly ten times the write volume of a typical day.

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