---
title: "Conflict-Free Multi-Region Replicated Data Store | Distributed Systems Architecture Canon"
description: "Multi-region active-active database utilizing Conflict-Free Replicated Data Types (CRDTs) to provide local write latency with mathematically guaranteed eventual convergence."
image: "https://tinycto.tv/assets/distributed-systems/distributed_systems_architectures_og.jpg"
canonicalUrl: "https://tinycto.tv/distributed-systems/architectures/multi-master-active-active-crdt"
locale: "en"
---

# Conflict-Free Multi-Region Replicated Data Store (`arch-multi-master-active-active-crdt`)

> **Architectural Pillar**: STORAGE_PARTITIONING | **Archetype**: CRDT_ACTIVE_ACTIVE
> **PACELC**: PA/EL | **Consensus Protocol**: None

Multi-region active-active database utilizing Conflict-Free Replicated Data Types (CRDTs) to provide local write latency with mathematically guaranteed eventual convergence.

### 3 Maturity Target Configurations

#### 1. Initial Target: 5,000 ops/sec

- **Guarantees**: State-based Last-Write-Wins Register (LWW-Element-Set)
- **Infrastructure Topology**: Two Redis clusters in US and EU synchronized via bidirectional CRDT replication.
- **Operational Trade-Off**: LWW-Element-Set relies on clock synchronization; clock skew can drop concurrent writes.

#### 2. Scaled Target: 60,000 ops/sec

- **Guarantees**: Observed-Remove Set (OR-Set) with Vector Clocks
- **Infrastructure Topology**: State replication across 3 continents using delta-CRDTs to minimize replication bandwidth.
- **Operational Trade-Off**: Delta tracking increases memory footprint until peer acknowledgments are received.

#### 3. Ultra-Scale Target: 500,000 ops/sec

- **Guarantees**: Pure Operation-Based CRDTs with Bounded Tombstone Compaction
- **Infrastructure Topology**: Worldwide mesh of 12 cloud points of presence communicating over QUIC streams with automatic tombstone cleanup.
- **Operational Trade-Off**: Requires strict causality tracking and dedicated distributed vector clock infrastructure.

### Handled Failure Modes

- `DS-FAIL-14: CRDT Tombstone Memory Bloat`
- `DS-FAIL-07: Clock Skew Ordering`


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