For starters, there are tons of indexes and snippets extrapolated from the data, and they're cached all over the place. More fundamentally, why do you think an

For starters, there are tons of indexes and snippets extrapolated from the data, and they're cached all over the place. More fundamentally, why do you think any of the records are mutable at all? You reap enormous benefits at that kind of scale by making all writes log-structured.