Grokking the System Design Interview, Volume II
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Code Judging System: Capacity Estimation

Step 3: Capacity Estimation

The requirements from step 2 name what the system must do. Now we turn them into numbers: how many users, how much data, how many requests per second.

User base. Assume 5 to 10 million registered users worldwide. On a normal day, hundreds of thousands of them are active. At peak, like a popular contest or the busiest hours, tens of thousands use the system at the same time.

Problem catalog. The catalog holds about 5,000 coding problems. Each has a description of a few KB of text, and a set of test cases

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