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system.zookeeper_connection

Querying in ClickHouse Cloud

The data in this system table is held locally on each node in ClickHouse Cloud. Obtaining a complete view of all data, therefore, requires the clusterAllReplicas function. See here for further details.

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 (UIn16) — The port of the ZooKeeper node that ClickHouse connected to.
  • index (Nullable(UInt8)) — The index of the ZooKeeper node that ClickHouse connected to. The index is from ZooKeeper config. If not connected, this column is NULL.
  • 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 (UInt8) — Keeper API version.
  • client_id (Int64) — Session id of the connection.
  • xid (Int64) — XID of the current session.
  • enabled_feature_flags (Array(Enum16)) — Feature flags which are enabled. Only applicable to ClickHouse Keeper. Possible values are FILTERED_LIST, MULTI_READ, CHECK_NOT_EXISTS, CREATE_IF_NOT_EXISTS, REMOVE_RECURSIVE.
  • availability_zone (String) — Availability zone.

Example: