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by seidoger 2708 days ago
The FDB Record Layer white paper [0], section 8.1, does open with:

> 8.1 New CloudKit Capabilities

> CloudKit was initially implemented using Cassandra as the underlying storage engine.

So it seems this is what happened, for CloudKit at least.

[0] https://www.foundationdb.org/files/record-layer-paper.pdf