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130 lines
7.9 KiB
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130 lines
7.9 KiB
Markdown
# system.zookeeper_log {#system-zookeeper_log}
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This table contains information about the parameters of the request to the ZooKeeper server and the response from it.
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For requests, only columns with request parameters are filled in, and the remaining columns are filled with default values (`0` or `NULL`). When the response arrives, the data from the response is added to the other columns.
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Columns with request parameters:
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- `type` ([Enum](../../sql-reference/data-types/enum.md)) — Event type in the ZooKeeper client. Can have one of the following values:
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- `Request` — The request has been sent.
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- `Response` — The response was received.
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- `Finalize` — The connection is lost, no response was received.
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- `event_date` ([Date](../../sql-reference/data-types/date.md)) — The date when the event happened.
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- `event_time` ([DateTime64](../../sql-reference/data-types/datetime64.md)) — The date and time when the event happened.
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- `address` ([IPv6](../../sql-reference/data-types/domains/ipv6.md)) — IP address of ZooKeeper server that was used to make the request.
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- `port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — The port of ZooKeeper server that was used to make the request.
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- `session_id` ([Int64](../../sql-reference/data-types/int-uint.md)) — The session ID that the ZooKeeper server sets for each connection.
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- `xid` ([Int32](../../sql-reference/data-types/int-uint.md)) — The ID of the request within the session. This is usually a sequential request number. It is the same for the request row and the paired `response`/`finalize` row.
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- `has_watch` ([UInt8](../../sql-reference/data-types/int-uint.md)) — The request whether the [watch](https://zookeeper.apache.org/doc/r3.3.3/zookeeperProgrammers.html#ch_zkWatches) has been set.
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- `op_num` ([Enum](../../sql-reference/data-types/enum.md)) — The type of request or response.
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- `path` ([String](../../sql-reference/data-types/string.md)) — The path to the ZooKeeper node specified in the request, or an empty string if the request not requires specifying a path.
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- `data` ([String](../../sql-reference/data-types/string.md)) — The data written to the ZooKeeper node (for the `SET` and `CREATE` requests — what the request wanted to write, for the response to the `GET` request — what was read) or an empty string.
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- `is_ephemeral` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Is the ZooKeeper node being created as an [ephemeral](https://zookeeper.apache.org/doc/r3.3.3/zookeeperProgrammers.html#Ephemeral+Nodes).
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- `is_sequential` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Is the ZooKeeper node being created as an [sequential](https://zookeeper.apache.org/doc/r3.3.3/zookeeperProgrammers.html#Sequence+Nodes+--+Unique+Naming).
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- `version` ([Nullable(Int32)](../../sql-reference/data-types/nullable.md)) — The version of the ZooKeeper node that the request expects when executing. This is supported for `CHECK`, `SET`, `REMOVE` requests (is relevant `-1` if the request does not check the version or `NULL` for other requests that do not support version checking).
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- `requests_size` ([UInt32](../../sql-reference/data-types/int-uint.md)) — The number of requests included in the multi request (this is a special request that consists of several consecutive ordinary requests and executes them atomically). All requests included in multi request will have the same `xid`.
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- `request_idx` ([UInt32](../../sql-reference/data-types/int-uint.md)) — The number of the request included in multi request (for multi request — `0`, then in order from `1`).
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Columns with request response parameters:
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- `zxid` ([Int64](../../sql-reference/data-types/int-uint.md)) — ZooKeeper transaction ID. The serial number issued by the ZooKeeper server in response to a successfully executed request (`0` if the request was not executed/returned an error/the client does not know whether the request was executed).
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- `error` ([Nullable(Enum)](../../sql-reference/data-types/nullable.md)) — Error code. Can have many values, here are just some of them:
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- `ZOK` — The request was executed seccessfully.
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- `ZCONNECTIONLOSS` — The connection was lost.
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- `ZOPERATIONTIMEOUT` — The request execution timeout has expired.
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- `ZSESSIONEXPIRED` — The session has expired.
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- `NULL` — The request is completed.
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- `watch_type` ([Nullable(Enum)](../../sql-reference/data-types/nullable.md)) — The type of the `watch` event (for responses with `op_num` = `Watch`), for the remaining responses: `NULL`.
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- `watch_state` ([Nullable(Enum)](../../sql-reference/data-types/nullable.md)) — The status of the `watch` event (for responses with `op_num` = `Watch`), for the remaining responses: `NULL`.
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- `path_created` ([String](../../sql-reference/data-types/string.md)) — The path to the created ZooKeeper node (for responses to the `CREATE` request), may differ from the `path` if the node is created as a `sequential`.
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- `stat_czxid` ([Int64](../../sql-reference/data-types/int-uint.md)) — The `zxid` of the change that caused this ZooKeeper node to be created.
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- `stat_mzxid` ([Int64](../../sql-reference/data-types/int-uint.md)) — The `zxid` of the change that last modified this ZooKeeper node.
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- `stat_pzxid` ([Int64](../../sql-reference/data-types/int-uint.md)) — The transaction ID of the change that last modified childern of this ZooKeeper node.
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- `stat_version` ([Int32](../../sql-reference/data-types/int-uint.md)) — The number of changes to the data of this ZooKeeper node.
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- `stat_cversion` ([Int32](../../sql-reference/data-types/int-uint.md)) — The number of changes to the children of this ZooKeeper node.
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- `stat_dataLength` ([Int32](../../sql-reference/data-types/int-uint.md)) — The length of the data field of this ZooKeeper node.
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- `stat_numChildren` ([Int32](../../sql-reference/data-types/int-uint.md)) — The number of children of this ZooKeeper node.
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- `children` ([Array(String)](../../sql-reference/data-types/array.md)) — The list of child ZooKeeper nodes (for responses to `LIST` request).
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**Example**
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Query:
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``` sql
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SELECT * FROM system.zookeeper_log WHERE (session_id = '106662742089334927') AND (xid = '10858') FORMAT Vertical;
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```
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Result:
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``` text
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Row 1:
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──────
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type: Request
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event_date: 2021-08-09
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event_time: 2021-08-09 21:38:30.291792
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address: ::
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port: 2181
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session_id: 106662742089334927
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xid: 10858
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has_watch: 1
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op_num: List
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path: /clickhouse/task_queue/ddl
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data:
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is_ephemeral: 0
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is_sequential: 0
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version: ᴺᵁᴸᴸ
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requests_size: 0
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request_idx: 0
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zxid: 0
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error: ᴺᵁᴸᴸ
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watch_type: ᴺᵁᴸᴸ
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watch_state: ᴺᵁᴸᴸ
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path_created:
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stat_czxid: 0
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stat_mzxid: 0
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stat_pzxid: 0
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stat_version: 0
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stat_cversion: 0
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stat_dataLength: 0
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stat_numChildren: 0
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children: []
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Row 2:
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──────
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type: Response
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event_date: 2021-08-09
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event_time: 2021-08-09 21:38:30.292086
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address: ::
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port: 2181
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session_id: 106662742089334927
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xid: 10858
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has_watch: 1
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op_num: List
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path: /clickhouse/task_queue/ddl
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data:
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is_ephemeral: 0
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is_sequential: 0
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version: ᴺᵁᴸᴸ
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requests_size: 0
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request_idx: 0
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zxid: 16926267
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error: ZOK
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watch_type: ᴺᵁᴸᴸ
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watch_state: ᴺᵁᴸᴸ
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path_created:
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stat_czxid: 16925469
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stat_mzxid: 16925469
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stat_pzxid: 16926179
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stat_version: 0
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stat_cversion: 7
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stat_dataLength: 0
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stat_numChildren: 7
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children: ['query-0000000006','query-0000000005','query-0000000004','query-0000000003','query-0000000002','query-0000000001','query-0000000000']
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```
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**See Also**
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- [ZooKeeper](../../operations/tips.md#zookeeper)
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- [ZooKeeper guide](https://zookeeper.apache.org/doc/r3.3.3/zookeeperProgrammers.html)
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