Introduction
Modern applications increasingly operate across multiple geographical regions to improve availability, reduce latency, and ensure business continuity. Whether you're building a disaster recovery strategy, enabling multi-region analytics, or serving users closer to their location, replicating data across data centers has become a critical architectural requirement.
ClickHouse® supports cross-datacenter replication through its ReplicatedMergeTree table engine. Combined with a distributed ClickHouse cluster and a coordination service such as ClickHouse Keeper, it allows organizations to maintain synchronized copies of data across multiple data centers while continuing to deliver high-performance analytical queries.
This architecture ensures that if one data center becomes unavailable due to hardware failures, network outages, or maintenance, other replicas continue serving requests with minimal disruption.
In this article, you'll learn how cross-datacenter replication works in ClickHouse®, the components involved, how to configure a replicated cluster, monitor replication health, troubleshoot common issues, and follow best practices for reliable deployments.
