Embedded ClickHouse Keeper vs External ZooKeeper for Operational Isolation on Node Failure
Selecting coordination for a ClickHouse cluster involves choosing between embedded ClickHouse Keeper and an external ZooKeeper ensemble. The decision is framed by a concrete operational constraint: maintaining metadata availability and DDL progress when individual ClickHouse nodes fail under load. ClickHouse Keeper runs in-process with the server since v21.8
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