The table does not exist if ZooKeeper is not configured. Allows reading data from the ZooKeeper cluster defined in the config.
The query must either have a ‘path =’ condition or a
path IN condition set with the
WHERE clause as shown below. This corresponds to the path of the children in ZooKeeper that you want to get data for.
SELECT * FROM system.zookeeper WHERE path = '/clickhouse' outputs data for all children on the
To output data for all root nodes, write path = ‘/’.
If the path specified in ‘path’ doesn’t exist, an exception will be thrown.
SELECT * FROM system.zookeeper WHERE path IN ('/', '/clickhouse') outputs data for all children on the
If in the specified ‘path’ collection has doesn't exist path, an exception will be thrown.
It can be used to do a batch of ZooKeeper path queries.
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.
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