Why System Design Interviews Ask You to Count Billions of Users Without a HashSet
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Why System Design Interviews Ask You to Count Billions of Users Without a HashSet
Your interviewer asks you to count how many unique requests your site had today. Easy, I'll throw their IDs in a HashSet. Done. Then your interviewer says: it's 100 billion requests. Your HashSet just consumed a terabyte of RAM. Uh oh. You could shard it and turn this into an expensive but solvable problem, but there's a much better approach ...
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