Delta: Highly available, strongly consistent storage using chain replication (2022)

AI Digest

Delta是Meta开发的高可用强一致性存储服务，采用链式复制技术，支持灾备与启动策略，对比分析链式复制与多数派复制的优劣。

Delta is Meta's high-available, strongly consistent storage using chain replication, designed for disaster recovery and bootstrap, with comparison to quorum replication.

Key points

• Delta通过链式复制实现高可用和强一致性，适用于关键灾备场景 Delta achieves high availability and strong consistency via chain replication for critical disaster recovery
• 链式复制在容错性上优于多数派复制，但存储效率较低 Chain replication offers better fault tolerance than quorum but lower storage efficiency
• Delta架构采用多链结构，每个链独立处理数据分片 Delta uses multi-chain architecture with independent data sharding per chain
• 写操作需全链确认，导致写延迟高于多数派系统 Write latency is higher due to full-chain confirmation requirement
• Delta优先保障可靠性而非存储效率或吞吐量 Prioritizes reliability over storage efficiency and throughput

Takeaway: Delta通过简化架构实现强一致性，适合对可靠性要求高于性能的灾备场景。 / Delta simplifies architecture for strong consistency, suitable for reliability-critical disaster recovery.

Why it matters 深入解析分布式存储设计权衡，对比不同复制机制的适用场景与技术选型。