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* Feature: Support new system table to show which zookeeper node be connected Description: ============ Currently we have no place to check which zk node be connected otherwise using lsof command. It not convenient Solution: ========= Implemented a new system table, system.zookeeper_host when CK Server has zk this table will show the zk node dir which connected by current CK server Noted: This table can support multi-zookeeper cluster scenario. * fixed review comments * added test case * update test cases * remove unused code * fixed review comments and removed unused code * updated test cases for print host, port and is_expired * modify the code comments * fixed CI Failed * fixed code style check failure * updated test cases by added Tags * update test reference * update test cases * added system.zookeeper_connection doc * Update docs/en/operations/system-tables/zookeeper_connection.md * Update docs/en/operations/system-tables/zookeeper_connection.md * Update docs/en/operations/system-tables/zookeeper_connection.md --------- Co-authored-by: Alexander Tokmakov <tavplubix@gmail.com>
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| slug |
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| /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(String) — When the connection was establishedis_expired(UInt8) — Is the current connection expired.keeper_api_version(String) — Keeper API version.client_id(UInt64) — Session id of the connection.
Example:
SELECT * FROM system.zookeeper_connection;
┌─name──────────────┬─host─────────┬─port─┬─index─┬──────connected_time─┬─is_expired─┬─keeper_api_version─┬──────────client_id─┐
│ default_zookeeper │ 127.0.0.1 │ 2181 │ 0 │ 2023-05-19 14:30:16 │ 0 │ 0 │ 216349144108826660 │
└───────────────────┴──────────────┴──────┴───────┴─────────────────────┴────────────┴────────────────────┴────────────────────┘