The original title is "Day 74/100 - Cross-Datacenter Replication in ClickHouse®"

Short summary

This tutorial covers cross-datacenter replication in ClickHouse using the ReplicatedMergeTree engine coordinated by ClickHouse Keeper. It explains the architecture of a replicated cluster with one shard and three replicas, how data parts are synchronized, and the benefits including fault tolerance, read scalability, and zero-downtime maintenance. The article targets engineers building multi-region analytical databases.

• •ReplicatedMergeTree engine plus ClickHouse Keeper enables cross-DC replication
• •Only newly created data parts are replicated, minimizing network traffic
• •Covers architecture, configuration, monitoring, and troubleshooting

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