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Lessons (3)

• Data Structures for Scale

  … Never use a Bloom-filter positive as proof of authorization or inventory ownership.

• Design a Polite Web Crawler

  … A Bloom filter cheaply says definitely unseen or possibly seen; false positives mean it cannot be the final …

• Caching & Redis

  … the "not found" result briefly, or use a Bloom filter to reject IDs that certainly don't exist …