K2+: A Multi-Region OLTP Database with Disaggregated Storage for High Availability and Strong Consistency

This is the authors' abstract. We don't add key points for this paper.

Cloud computing has fundamentally reshaped database system architectures by enabling the decoupling of compute and storage resources and supporting global, multi-region deployments. However, effectively integrating storage-disaggregated architectures with multi-region OLTP processing remains challenging, particularly when maintaining transactional consistency and performing cross-region replication. This paper presents K2+, a multi-region transactional key-value store. K2+ achieves fine-grained data partitioning across regions by combining region-local storage pools with independent, region-specific commit logs. To support replication within and across regions, K2+ incorporates regional partition management with dedicated cross-region replication middleware. This architecture allows different regions to split, merge, and place physical partitions independently while preserving high reliability, high availability, and strong consistency.