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Concerning that their total uncompressed data size including full history is only 520MB and they built this complex distributed system rather than, say, rsyncing an sqlite database. It sounds like only Netflix staff write to the database.

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I don't know any of the details, but they seem to have moved a lot of their internal stuff to Hollow.

So maybe it's just an attempt at unification of the tech stack, rather than a concrete need. But Hollow itself is definitely heavily used within, e.g. see its whitepaper.

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