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Interview: What Is a Bloom Filter?š§ Analytics Table
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Bloom Filters Explained With a Username Check!š§ An app with 500 million users canāt afford a database query every time someone types a username. A Bloom filter handles most of those checks in memory. Itās a long row of bits, all starting at 0, plus a few hash functions that turn any text into a number. When āJohnā signs up, three hash functions return positions like 4, 19 and 42, and those bits flip to 1. The word āJohnā itself is never stored in the filter. To check a new username, hash it the same way. If any of its bits is still 0, that name was never added, so itās definitely available. If all its bits are 1, the name might be taken, since other usernames could have flipped those same bits. Thatās a false positive, and only then does the app ask the database. šSubscribe if you want more data structures explained with real examples. #BloomFilter #SystemDesign #DataStructures #HashFunctions #BackendEngineering #SoftwareEngineering #Programming #Scalability #DatabaseOptimization #ComputerScience #CodingInterview #TechExplained #KodeKloud
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