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Merge pull request #38655 from den-crane/patch-18

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Doc. Fix a note about ClickHouse Keeper
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alesapin 2022-07-01 13:40:29 +02:00 committed by GitHub
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docs/en/operations/tips.md
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@ -128,7 +128,8 @@ You should never use manually written scripts to transfer data between different
If you want to divide an existing ZooKeeper cluster into two, the correct way is to increase the number of its replicas and then reconfigure it as two independent clusters. If you want to divide an existing ZooKeeper cluster into two, the correct way is to increase the number of its replicas and then reconfigure it as two independent clusters.
You can run ClickHouse Keeper on the same server as ClickHouse, but do not run ZooKeeper on the same servers as ClickHouse. Because ZooKeeper is very sensitive for latency and ClickHouse may utilize all available system resources. You can run ClickHouse Keeper on the same server as ClickHouse in test environments, or in environments with low ingestion rate.
For production environments we suggest to use separate servers for ClickHouse and ZooKeeper/Keeper, or place ClickHouse files and Keeper files on to separate disks. Because ZooKeeper/Keeper are very sensitive for disk latency and ClickHouse may utilize all available system resources.
You can have ZooKeeper observers in an ensemble but ClickHouse servers should not interact with observers. You can have ZooKeeper observers in an ensemble but ClickHouse servers should not interact with observers.