v.21.6Improvement

Querying system.tables no longer accesses ZooKeeper

Official CH changelog text
Querying system.tables does not go to ZooKeeper anymore. #23793 (Fuwang Hu).
Querying system.tables no longer accesses ZooKeeper, improving query performance and reducing load.

Why it matters

Previously, querying the system.tables system table involved communication with ZooKeeper, which could introduce latency and unnecessary load. This change optimizes the process by removing ZooKeeper access, thereby speeding up metadata querying and enhancing overall system efficiency.

How to use it

Users benefit from this improvement automatically when querying system.tables; no additional configuration or changes in query syntax are required.

Related resources

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