2020-06-22 08:45:22 +00:00
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---
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machine_translated: true
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machine_translated_rev: 5decc73b5dc60054f19087d3690c4eb99446a6c3
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---
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2021-06-24 12:47:02 +00:00
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# system.zookeeper {#system-zookeeper}
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2020-06-22 08:45:22 +00:00
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2021-06-24 12:47:02 +00:00
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如果未配置ZooKeeper，则该表不存在。 允许从配置中定义的ZooKeeper集群读取数据。
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查询必须具有 ‘path’ WHERE子句中的相等条件。 这是ZooKeeper中您想要获取数据的子路径。
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2020-06-22 08:45:22 +00:00
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2021-06-24 12:47:02 +00:00
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查询 `SELECT * FROM system.zookeeper WHERE path = '/clickhouse'` 输出`/clickhouse`节点的对所有子路径的数据。
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要输出所有根节点的数据，使用path= ‘/’.
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如果在指定的路径 ‘path’ 不存在，将引发异常。
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2021-02-05 09:46:08 +00:00
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查询`SELECT * FROM system.zookeeper WHERE path IN ('/', '/clickhouse')` 输出`/` 和 `/clickhouse`节点上所有子节点的数据。
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如果在指定的 ‘path’ 集合中有不存在的路径，将引发异常。
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它可以用来做一批ZooKeeper路径查询。
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2020-06-22 08:45:22 +00:00
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列:
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2021-06-24 12:47:02 +00:00
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- `name` (String) — 节点的名字。
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- `path` (String) — 节点的路径。
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- `value` (String) — 节点的值。
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- `dataLength` (Int32) — 节点的值长度。
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- `numChildren` (Int32) — 子节点的个数。
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- `czxid` (Int64) — 创建该节点的事务ID。
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- `mzxid` (Int64) — 最后修改该节点的事务ID。
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- `pzxid` (Int64) — 最后删除或者增加子节点的事务ID。
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- `ctime` (DateTime) — 节点的创建时间。
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- `mtime` (DateTime) — 节点的最后修改时间。
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- `version` (Int32) — 节点版本：节点被修改的次数。
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- `cversion` (Int32) — 增加或删除子节点的个数。
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- `aversion` (Int32) — ACL的修改次数。
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- `ephemeralOwner` (Int64) — 针对临时节点，拥有该节点的事务ID。
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2020-06-22 08:45:22 +00:00
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示例:
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``` sql
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SELECT *
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FROM system.zookeeper
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WHERE path = '/clickhouse/tables/01-08/visits/replicas'
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FORMAT Vertical
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```
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``` text
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Row 1:
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──────
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name: example01-08-1.yandex.ru
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value:
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czxid: 932998691229
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mzxid: 932998691229
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ctime: 2015-03-27 16:49:51
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mtime: 2015-03-27 16:49:51
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version: 0
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cversion: 47
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aversion: 0
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ephemeralOwner: 0
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dataLength: 0
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numChildren: 7
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pzxid: 987021031383
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path: /clickhouse/tables/01-08/visits/replicas
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Row 2:
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──────
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name: example01-08-2.yandex.ru
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value:
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czxid: 933002738135
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mzxid: 933002738135
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ctime: 2015-03-27 16:57:01
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mtime: 2015-03-27 16:57:01
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version: 0
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cversion: 37
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aversion: 0
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ephemeralOwner: 0
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dataLength: 0
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numChildren: 7
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pzxid: 987021252247
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path: /clickhouse/tables/01-08/visits/replicas
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```
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2021-06-24 12:47:02 +00:00
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[原文](https://clickhouse.tech/docs/zh/operations/system-tables/zookeeper) <!--hide-->
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