How to Identify and Resolve Replication Conflicts in ClickHouse Clusters

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ClickHouse uses the ReplicatedMergeTree engine to replicate immutable data parts across multiple servers, coordinating synchronization through ClickHouse Keeper rather than row-level changes. While this architecture is highly reliable, issues such as network interruptions, Keeper outages, disk failures, or configuration mismatches can cause replicas to fall out of sync. Common symptoms include replicas entering read-only mode, growing replication queues, missing data parts, and schema mismatches between nodes. ClickHouse provides built-in system tables, such as system.replicas, that allow administrators to monitor replica health and diagnose the root cause of replication problems. Resolving these issues typically involves querying system tables, inspecting the replication queue, and using ClickHouse's administrative tools to restore cluster consistency.

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