Conflict-free Replicated Data Types: An Overview

06/27/2018

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by   Nuno Preguiça, et al.

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Internet-scale distributed systems often replicate data at multiple geographic locations to provide low latency and high availability, despite node and network failures. Geo-replicated systems that adopt a weak consistency model allow replicas to temporarily diverge, requiring a mechanism for merging concurrent updates into a common state. Conflict-free Replicated Data Types (CRDT) provide a principled approach to address this problem. This document presents an overview of Conflict-free Replicated Data Types research and practice, organizing the presentation in the aspects relevant for the application developer, the system developer and the CRDT developer.