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benlivengood
on Nov 2, 2020
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You might not need to store plaintext email addres...
It's pretty scalable. 10 billion email addresses times 16+32+4 bytes of salt, SHA512/256, and ID is 520GB of RAM; available in a single (big) machine and searchable in under a second with a few cores.
Shard it into multiple machines for higher QPS.
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Shard it into multiple machines for higher QPS.