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57d60dc4f2
* Refactor the code * Add a new column xid for zookeeper_connection * Support hostnames in the configuration * Fix a typo * Fix a typo * Fix a typo * Fix a bug about connect_time * Update test case * Update test case * Fix a special build check error * Resolve conflicts caused by rebase. * Update failed test case * Refactor the code according to comment * Fix two compilation errors
32 lines
2.3 KiB
Markdown
32 lines
2.3 KiB
Markdown
---
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slug: /en/operations/system-tables/zookeeper_connection
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---
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#zookeeper_connection
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This table does not exist if ZooKeeper is not configured. The 'system.zookeeper_connection' table shows current connections to ZooKeeper (including auxiliary ZooKeepers). Each row shows information about one connection.
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Columns:
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- `name` ([String](../../sql-reference/data-types/string.md)) — ZooKeeper cluster's name.
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- `host` ([String](../../sql-reference/data-types/string.md)) — The hostname/IP of the ZooKeeper node that ClickHouse connected to.
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- `port` ([String](../../sql-reference/data-types/string.md)) — The port of the ZooKeeper node that ClickHouse connected to.
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- `index` ([UInt8](../../sql-reference/data-types/int-uint.md)) — The index of the ZooKeeper node that ClickHouse connected to. The index is from ZooKeeper config.
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- `connected_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — When the connection was established
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- `session_uptime_elapsed_seconds` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Seconds elapsed since the connection was established
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- `is_expired` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Is the current connection expired.
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- `keeper_api_version` ([String](../../sql-reference/data-types/string.md)) — Keeper API version.
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- `client_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Session id of the connection.
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- `xid` ([Int32](../../sql-reference/data-types/int-uint.md)) — Xid of the current session.
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Example:
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``` sql
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SELECT * FROM system.zookeeper_connection;
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```
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``` text
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┌─name────┬─host──────┬─port─┬─index─┬──────connected_time─┬─session_uptime_elapsed_seconds─┬─is_expired─┬─keeper_api_version─┬─client_id─┐
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│ default │ 127.0.0.1 │ 9181 │ 0 │ 2023-06-15 14:36:01 │ 3058 │ 0 │ 3 │ 5 │
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└─────────┴───────────┴──────┴───────┴─────────────────────┴────────────────────────────────┴────────────┴────────────────────┴───────────┘
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```
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