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系统。动物园管理员

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子句中的相等条件或者在某个集合中的条件。 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。

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。 如果在指定的 ‘path’ 集合中有不存在的路径，将引发异常。 它可以用来做一批ZooKeeper路径查询。

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:

SELECT *
FROM system.zookeeper
WHERE path = '/clickhouse/tables/01-08/visits/replicas'
FORMAT Vertical

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