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The FoundationDB Record Layer is an open source library
that provides a record-oriented datastore with semantics
similar to a relational database, implemented on top of FoundationDB, an ordered, transactional key-value store. The
Record Layer provides a lightweight, highly extensible way
to store structured data. It offers schema management and a
rich set of query and indexing facilities, some of which are
not usually found in traditional relational databases, such
as nested record types, indexes on commit versions, and indexes that span multiple record types. The Record Layer is
stateless and built for massive multi-tenancy, encapsulating
and isolating all of a tenant’s state, including indexes, into a
separate logical database. We demonstrate how the Record
Layer is used by CloudKit, Apple’s cloud backend service, to
provide powerful abstractions to applications serving hundreds of millions of users. CloudKit uses the Record Layer
to host billions of independent databases, many with a common schema. Features provided by the Record Layer enable
CloudKit to provide richer APIs and stronger semantics, with
reduced maintenance overhead and improved scalability.
filetype:pdf  foundationdb  apple  paper  comp-sci  database  scale  design  experience 
january 2019 by jabley
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