v.20.12Improvement

Auxiliary Zookeepers Configuration Reloadable Without Server Restart

Official CH changelog text
Now, <auxiliary_zookeepers> configuration can be changed in config.xml and reloaded without server startup. #16627 (Amos Bird).
The <auxiliary_zookeepers> configuration can now be modified in config.xml and reloaded dynamically without requiring a server restart.

Why it matters

This feature enables administrators to update auxiliary ZooKeeper server configurations on the fly, reducing downtime and operational disruption by eliminating the need to restart the ClickHouse server after configuration changes.

How to use it

Edit the <auxiliary_zookeepers> section in the config.xml file and then reload the configuration using the appropriate ClickHouse server command to apply changes without restarting the server.

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