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The formula said 1.0039%. Ten million queries said 1.0056%.
A Bloom filter's error rate is one of the few things we teach that you can actually check, so I built one, inserted 500,000 keys, queried it with ten million keys that were not in it, and compared the result against the textbook formula at seven different sizings.
AdminAugust 11, 202613 min read

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