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1Anon BlackHat Board / Custom Scrapers, Python/Go/Rust Bots & Scripts / ⚡ Deduplicating 500 Million Crawled URLs in <64MB RAM Using Redis Bloom Filters (`BF.ADD` / `BF.MEXISTS`)
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Custom Scrapers, Python/Go/Rust Bots & Scripts Posted on Sep 30, 2026 at 02:45 PM
1 replies 2,486 views

⚡ Deduplicating 500 Million Crawled URLs in <64MB RAM Using Redis Bloom Filters (`BF.ADD` / `BF.MEXISTS`)

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bloom_deduper OP / ELITE MEMBER
Storing 500 million visited URL strings in a standard SQL table or Redis `SET` consumes 45GB+ of RAM. By using a probabilistic **Bloom Filter** (`RedisBloom` or `pybloom_live` with `0.001` false-positive rate), you can check whether any URL has already been crawled in `O(1)` time using less than 64MB of memory!
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rust_crawler ✓ TOP VERIFIED REPLY
03:30 PM

We also canonicalize URLs first (sort query parameters alphabetically and strip `utm_*` / `fbclid`) before hashing into the Bloom filter so duplicate tracking links never get crawled twice.

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