ClickHouse/docs/en/operations/system-tables/zookeeper_connection.md
helifu 57d60dc4f2
Add a new column xid for zookeeper_connection (#50702)
* 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
2023-10-20 11:38:44 +02:00

2.3 KiB

slug
/en/operations/system-tables/zookeeper_connection

#zookeeper_connection

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.

Columns:

  • name (String) — ZooKeeper cluster's name.
  • host (String) — The hostname/IP of the ZooKeeper node that ClickHouse connected to.
  • port (String) — The port of the ZooKeeper node that ClickHouse connected to.
  • index (UInt8) — The index of the ZooKeeper node that ClickHouse connected to. The index is from ZooKeeper config.
  • connected_time (DateTime) — When the connection was established
  • session_uptime_elapsed_seconds (UInt64) — Seconds elapsed since the connection was established
  • is_expired (UInt8) — Is the current connection expired.
  • keeper_api_version (String) — Keeper API version.
  • client_id (UInt64) — Session id of the connection.
  • xid (Int32) — Xid of the current session.

Example:

SELECT * FROM system.zookeeper_connection;
┌─name────┬─host──────┬─port─┬─index─┬──────connected_time─┬─session_uptime_elapsed_seconds─┬─is_expired─┬─keeper_api_version─┬─client_id─┐
│ default │ 127.0.0.1 │ 9181 │     0 │ 2023-06-15 14:36:01 │                           3058 │          0 │                  3 │         5 │
└─────────┴───────────┴──────┴───────┴─────────────────────┴────────────────────────────────┴────────────┴────────────────────┴───────────┘