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

The daily average of this system is modest. The load that decides the design is the spike at the end of a contest, and the estimates below size both.

Users. Assume 5 to 10 million registered users, of whom about 500,000 are active on a typical day. During busy hours or a popular contest, tens of thousands use the site at the same moment.

Problems and test data. The catalog holds about 5,000 problems. Each has a description of a few KB and 50 to 80 hidden test cases. Test files average about 50 KB, and the largest reach several MB

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