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SaltTan
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Mar 24, 2026
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| ## ON CLUSTER relation (important) | ||
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| `ON CLUSTER` itself uses Keeper-backed distributed DDL queue (row 4). |
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| `ON CLUSTER` itself uses Keeper-backed distributed DDL queue (row 4). | |
| `ON CLUSTER` itself relies on a Keeper-backed distributed DDL queue (see row 4). |
| ## ON CLUSTER relation (important) | ||
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| `ON CLUSTER` itself uses Keeper-backed distributed DDL queue (row 4). | ||
| Some features above already replicate through Keeper, so `ON CLUSTER` can be redundant: |
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| Some features above already replicate through Keeper, so `ON CLUSTER` can be redundant: | |
| Some of the features listed above already replicate via Keeper, which can make `ON CLUSTER` redundant: |
| | 15 | Experimental transactions | Configure `transaction_log.zookeeper_path` (and enable related experimental transaction settings). | Default: `/clickhouse/txn`. | `<path>/tail_ptr` and `<path>/log/csn-*` sequential nodes storing commit sequence and transaction IDs. | | ||
| | 16 | `Shared` database engine (Cloud) | ClickHouse Cloud managed behavior (not typically user-configured in self-managed OSS). | Internal/cloud-managed. | Shared catalog is Keeper-backed; low-level path layout is internal and not documented as a stable public contract. | | ||
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| ## ON CLUSTER relation (important) |
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| ## ON CLUSTER relation (important) | |
| ## How ON CLUSTER fits in (important) |
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| ## Notes | ||
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| - For many rows, path names can be redirected to auxiliary Keeper clusters using `<auxiliary_zookeepers>` and `cluster_name:/path` notation where supported. |
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| - For many rows, path names can be redirected to auxiliary Keeper clusters using `<auxiliary_zookeepers>` and `cluster_name:/path` notation where supported. | |
| - For many features, path names can be redirected to auxiliary Keeper clusters using `<auxiliary_zookeepers>` and the `cluster_name:/path` notation, where supported. |
| ## Notes | ||
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| - For many rows, path names can be redirected to auxiliary Keeper clusters using `<auxiliary_zookeepers>` and `cluster_name:/path` notation where supported. | ||
| - Node names shown above are the stable conceptual layout from current source tree; some minor subnodes are version-specific. |
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| - Node names shown above are the stable conceptual layout from current source tree; some minor subnodes are version-specific. | |
| - The metadata structure shown above reflects the stable conceptual layout from the current source tree; some minor subnodes may vary by version. |
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