mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-15 20:24:07 +00:00
76 lines
2.4 KiB
Markdown
76 lines
2.4 KiB
Markdown
|
---
|
|||
|
|
machine_translated: true
|
|||
|
|
machine_translated_rev: 5decc73b5dc60054f19087d3690c4eb99446a6c3
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
# 系统。动物园管理员 {#system-zookeeper}
|
|||
|
|
|
|||
|
|
如果未配置ZooKeeper，则表不存在。 允许从配置中定义的ZooKeeper集群读取数据。
|
|||
|
|
查询必须具有 ‘path’ WHERE子句中的平等条件。 这是ZooKeeper中您想要获取数据的孩子的路径。
|
|||
|
|
|
|||
|
|
查询 `SELECT * FROM system.zookeeper WHERE path = '/clickhouse'` 输出对所有孩子的数据 `/clickhouse` 节点。
|
|||
|
|
要输出所有根节点的数据，write path= ‘/’.
|
|||
|
|
如果在指定的路径 ‘path’ 不存在，将引发异常。
|
|||
|
|
|
|||
|
|
列:
|
|||
|
|
|
|||
|
|
- `name` (String) — The name of the node.
|
|||
|
|
- `path` (String) — The path to the node.
|
|||
|
|
- `value` (String) — Node value.
|
|||
|
|
- `dataLength` (Int32) — Size of the value.
|
|||
|
|
- `numChildren` (Int32) — Number of descendants.
|
|||
|
|
- `czxid` (Int64) — ID of the transaction that created the node.
|
|||
|
|
- `mzxid` (Int64) — ID of the transaction that last changed the node.
|
|||
|
|
- `pzxid` (Int64) — ID of the transaction that last deleted or added descendants.
|
|||
|
|
- `ctime` (DateTime) — Time of node creation.
|
|||
|
|
- `mtime` (DateTime) — Time of the last modification of the node.
|
|||
|
|
- `version` (Int32) — Node version: the number of times the node was changed.
|
|||
|
|
- `cversion` (Int32) — Number of added or removed descendants.
|
|||
|
|
- `aversion` (Int32) — Number of changes to the ACL.
|
|||
|
|
- `ephemeralOwner` (Int64) — For ephemeral nodes, the ID of the session that owns this node.
|
|||
|
|
|
|||
|
|
示例:
|
|||
|
|
|
|||
|
|
``` sql
|
|||
|
|
SELECT *
|
|||
|
|
FROM system.zookeeper
|
|||
|
|
WHERE path = '/clickhouse/tables/01-08/visits/replicas'
|
|||
|
|
FORMAT Vertical
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
``` text
|
|||
|
|
Row 1:
|
|||
|
|
──────
|
|||
|
|
name: example01-08-1.yandex.ru
|
|||
|
|
value:
|
|||
|
|
czxid: 932998691229
|
|||
|
|
mzxid: 932998691229
|
|||
|
|
ctime: 2015-03-27 16:49:51
|
|||
|
|
mtime: 2015-03-27 16:49:51
|
|||
|
|
version: 0
|
|||
|
|
cversion: 47
|
|||
|
|
aversion: 0
|
|||
|
|
ephemeralOwner: 0
|
|||
|
|
dataLength: 0
|
|||
|
|
numChildren: 7
|
|||
|
|
pzxid: 987021031383
|
|||
|
|
path: /clickhouse/tables/01-08/visits/replicas
|
|||
|
|
|
|||
|
|
Row 2:
|
|||
|
|
──────
|
|||
|
|
name: example01-08-2.yandex.ru
|
|||
|
|
value:
|
|||
|
|
czxid: 933002738135
|
|||
|
|
mzxid: 933002738135
|
|||
|
|
ctime: 2015-03-27 16:57:01
|
|||
|
|
mtime: 2015-03-27 16:57:01
|
|||
|
|
version: 0
|
|||
|
|
cversion: 37
|
|||
|
|
aversion: 0
|
|||
|
|
ephemeralOwner: 0
|
|||
|
|
dataLength: 0
|
|||
|
|
numChildren: 7
|
|||
|
|
pzxid: 987021252247
|
|||
|
|
path: /clickhouse/tables/01-08/visits/replicas
|
|||
|
|
```
|