The table does not exist unless ClickHouse Keeper or ZooKeeper is configured. The
system.zookeeper table exposes data from the Keeper 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 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’ does not 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 does not exist path, an exception will be thrown.
It can be used to do a batch of Keeper 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.
WHERE path = '/clickhouse/tables/01-08/visits/replicas'
ctime: 2015-03-27 16:49:51
mtime: 2015-03-27 16:49:51
ctime: 2015-03-27 16:57:01
mtime: 2015-03-27 16:57:01