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    Has anyone seen it in the wild? Other than Apple?

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      Many people. Check the HN thread.

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        I’m guessing not, because their goal is a lower level “building blocks” interface

        FoundationDB (FDB) [5] was created in 2009 and gets its name from the focus on providing what we saw as the foundational set of building blocks required to build higher-level distributed systems.It is an ordered, transactional, key-value store natively supporting multi-key strictly serializable transactions across its entire key-space. Unlike most databases, which bundle together a storage engine, data model, and query language, forcing users to choose all three or none, FDB takes a modular approach: it provides a highly scalable, transactional storage engine with a minimal yet carefully chosen set of features. It provides no structured semantics, no query language, data model or schema management, secondary indices or many other features one normally finds in a transactional database. Offering these would benefit some applications but others that do not require them (or do so in a slightly different form) would need to work around. Instead, the NoSQL model leaves application developers with great flexibility. While FDB defaults to strictly serializable transactions, it allows relaxing these semantics for applications that don’t require them with flexible, fine-grained controls over conflicts.