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Why am I writing a data store? Because my online backup service needs to store 200,000 key-value pairs for every $/month of revenue, and existing data stores aren't optimized very well for very large numbers of very small records.

Really? Every one of the dozens of open-source key/value stores is so far off from your requirements that they just don't work for you?

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Yes. The most common problem is being designed for large values. My situation of having a large number of very small values is unusual, so it's not surprising that existing code isn't optimized for this case.

Did you know that only two, maybe three of those datastores are any good? And did you know that of those three, they're not designed for every workload?

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