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Version: 2.3.10

Clickhouse

Clickhouse sink connector

Support Those Engines​

Spark
Flink
SeaTunnel Zeta

Key Features​

The Clickhouse sink plug-in can achieve accuracy once by implementing idempotent writing, and needs to cooperate with aggregatingmergetree and other engines that support deduplication.

Description​

Used to write data to Clickhouse.

Supported DataSource Info​

In order to use the Clickhouse connector, the following dependencies are required. They can be downloaded via install-plugin.sh or from the Maven central repository.

DatasourceSupported VersionsDependency
ClickhouseuniversalDownload

Data Type Mapping​

SeaTunnel Data TypeClickhouse Data Type
STRINGString / Int128 / UInt128 / Int256 / UInt256 / Point / Ring / Polygon MultiPolygon
INTInt8 / UInt8 / Int16 / UInt16 / Int32
BIGINTUInt64 / Int64 / IntervalYear / IntervalQuarter / IntervalMonth / IntervalWeek / IntervalDay / IntervalHour / IntervalMinute / IntervalSecond
DOUBLEFloat64
DECIMALDecimal
FLOATFloat32
DATEDate
TIMEDateTime
ARRAYArray
MAPMap

Sink Options​

NameTypeRequiredDefaultDescription
hostStringYes-ClickHouse cluster address, the format is host:port , allowing multiple hosts to be specified. Such as "host1:8123,host2:8123".
databaseStringYes-The ClickHouse database.
tableStringYes-The table name.
usernameStringYes-ClickHouse user username.
passwordStringYes-ClickHouse user password.
clickhouse.configMapNoIn addition to the above mandatory parameters that must be specified by clickhouse-jdbc , users can also specify multiple optional parameters, which cover all the parameters provided by clickhouse-jdbc.
bulk_sizeStringNo20000The number of rows written through Clickhouse-jdbc each time, the default is 20000.
split_modeStringNofalseThis mode only support clickhouse table which engine is 'Distributed'.And internal_replication option-should be true.They will split distributed table data in seatunnel and perform write directly on each shard. The shard weight define is clickhouse will counted.
sharding_keyStringNo-When use split_mode, which node to send data to is a problem, the default is random selection, but the 'sharding_key' parameter can be used to specify the field for the sharding algorithm. This option only worked when 'split_mode' is true.
primary_keyStringNo-Mark the primary key column from clickhouse table, and based on primary key execute INSERT/UPDATE/DELETE to clickhouse table.
support_upsertBooleanNofalseSupport upsert row by query primary key.
allow_experimental_lightweight_deleteBooleanNofalseAllow experimental lightweight delete based on *MergeTree table engine.
schema_save_modeEnumnoCREATE_SCHEMA_WHEN_NOT_EXISTSchema save mode. Please refer to the schema_save_mode section below.
data_save_modeEnumnoAPPEND_DATAData save mode. Please refer to the data_save_mode section below.
custom_sqlStringno-When data_save_mode selects CUSTOM_PROCESSING, you should fill in the CUSTOM_SQL parameter. This parameter usually fills in a SQL that can be executed. SQL will be executed before synchronization tasks.
save_mode_create_templatestringnosee belowSee below.
common-optionsNo-Sink plugin common parameters, please refer to Sink Common Options for details.

schema_save_mode[Enum]​

Before starting the synchronization task, choose different processing options for the existing table schema.
Option descriptions:
RECREATE_SCHEMA: Create the table if it does not exist; drop and recreate the table when saving.
CREATE_SCHEMA_WHEN_NOT_EXIST: Create the table if it does not exist; skip if the table already exists.
ERROR_WHEN_SCHEMA_NOT_EXIST: Throw an error if the table does not exist.
IGNORE: Ignore the processing of the table.

data_save_mode[Enum]​

Before starting the synchronization task, choose different processing options for the existing data on the target side.
Option descriptions:
DROP_DATA: Retain the database schema but delete the data.
APPEND_DATA: Retain the database schema and the data.
CUSTOM_PROCESSING: Custom user-defined processing.
ERROR_WHEN_DATA_EXISTS: Throw an error if data exists.

save_mode_create_template​

Automatically create Clickhouse tables using templates.
The table creation statements will be generated based on the upstream data types and schema. The default template can be modified as needed.

Default template:

CREATE TABLE IF NOT EXISTS `${database}`.`${table}` (
    ${rowtype_primary_key},
    ${rowtype_fields}
) ENGINE = MergeTree()
ORDER BY (${rowtype_primary_key})
PRIMARY KEY (${rowtype_primary_key})
SETTINGS
    index_granularity = 8192
COMMENT '${comment}';

If custom fields are added to the template, for example, adding an id field:

CREATE TABLE IF NOT EXISTS `${database}`.`${table}` (
    id,
    ${rowtype_fields}
) ENGINE = MergeTree()
    ORDER BY (${rowtype_primary_key})
    PRIMARY KEY (${rowtype_primary_key})
    SETTINGS
    index_granularity = 8192
COMMENT '${comment}';

The connector will automatically retrieve the corresponding types from the upstream source and fill in the template, removing the id field from the rowtype_fields. This method can be used to modify custom field types and attributes.

The following placeholders can be used:

  • database: Retrieves the database from the upstream schema.
  • table_name: Retrieves the table name from the upstream schema.
  • rowtype_fields: Retrieves all fields from the upstream schema and automatically maps them to Clickhouse field descriptions.
  • rowtype_primary_key: Retrieves the primary key from the upstream schema (this may be a list).
  • rowtype_unique_key: Retrieves the unique key from the upstream schema (this may be a list).
  • comment: Retrieves the table comment from the upstream schema.

How to Create a Clickhouse Data Synchronization Jobs​

The following example demonstrates how to create a data synchronization job that writes randomly generated data to a Clickhouse database:

# Set the basic configuration of the task to be performed
env {
  parallelism = 1
  job.mode = "BATCH"
  checkpoint.interval  = 1000
}

source {
  FakeSource {
      row.num = 2
      bigint.min = 0
      bigint.max = 10000000
      split.num = 1
      split.read-interval = 300
      schema {
        fields {
          c_bigint = bigint
        }
      }
    }
}

sink {
  Clickhouse {
    host = "127.0.0.1:9092"
    database = "default"
    table = "test"
    username = "xxxxx"
    password = "xxxxx"
  }
}

Tips​

1.SeaTunnel Deployment Document.
2.The table to be written to needs to be created in advance before synchronization.
3.When sink is writing to the ClickHouse table, you don't need to set its schema because the connector will query ClickHouse for the current table's schema information before writing.

Clickhouse Sink Config​

sink {
  Clickhouse {
    host = "localhost:8123"
    database = "default"
    table = "fake_all"
    username = "xxxxx"
    password = "xxxxx"
    clickhouse.config = {
      max_rows_to_read = "100"
      read_overflow_mode = "throw"
    }
  }
}

Split Mode​

sink {
  Clickhouse {
    host = "localhost:8123"
    database = "default"
    table = "fake_all"
    username = "xxxxx"
    password = "xxxxx"
    
    # split mode options
    split_mode = true
    sharding_key = "age"
  }
}

CDC(Change data capture) Sink​

sink {
  Clickhouse {
    host = "localhost:8123"
    database = "default"
    table = "fake_all"
    username = "xxxxx"
    password = "xxxxx"
    
    # cdc options
    primary_key = "id"
    support_upsert = true
  }
}

CDC(Change data capture) for *MergeTree engine​

sink {
  Clickhouse {
    host = "localhost:8123"
    database = "default"
    table = "fake_all"
    username = "xxxxx"
    password = "xxxxx"
    
    # cdc options
    primary_key = "id"
    support_upsert = true
    allow_experimental_lightweight_delete = true
  }
}

Changelog​

Change Log
ChangeCommitVersion
[Fix][Clickhouse] Parallelism makes data duplicate (#8916)https://github.com/apache/seatunnel/commit/45345f2732.3.10
[Fix][Connector-V2]Fix Descriptions for CUSTOM_SQL in Connector (#8778)https://github.com/apache/seatunnel/commit/96b610eb72.3.10
[improve] update clickhouse connector config option (#8755)https://github.com/apache/seatunnel/commit/b964189b72.3.10
[Fix][Connector-V2] fix starRocks automatically creates tables with comment (#8568)https://github.com/apache/seatunnel/commit/c4cb1fc4a2.3.10
[Fix][Connector-V2] Fixed adding table comments (#8514)https://github.com/apache/seatunnel/commit/edca75b0d2.3.10
[hotfix] fix exceptions caused by operator priority in connector-clickhouse when using sharding_key (#8162)https://github.com/apache/seatunnel/commit/5560e3dab2.3.9
[Imporve][ClickhouseFile] Directly connect to each shard node to obtain the corresponding path (#8449)https://github.com/apache/seatunnel/commit/757641bad2.3.9
[Feature][ClickhouseFile] Support add publicKey to identity (#8351)https://github.com/apache/seatunnel/commit/287b8c8212.3.9
[Improve][ClickhouseFile] Improve rsync log output (#8332)https://github.com/apache/seatunnel/commit/179223e3c2.3.9
[Improve][ClickhouseFile] Added attach sql log for better debugging (#8315)https://github.com/apache/seatunnel/commit/ade428c5f2.3.9
[Chore] delete chinese desc in code (#8306)https://github.com/apache/seatunnel/commit/a50a8b9252.3.9
[Improve][ClickhouseFile Connector] Unified specifying clickhouse file generation path (#8302)https://github.com/apache/seatunnel/commit/455f1ed762.3.9
[Improve][ClickhouseFile] Clickhouse supports option configuration when connecting to shard nodes (#8297)https://github.com/apache/seatunnel/commit/1ded1b6202.3.9
[Imporve][ClickhouseFile] Improve clickhousefile generation parameter configuration (#8293)https://github.com/apache/seatunnel/commit/753e058fe2.3.9
[Improve][ClickhouseFile] ClickhouseFile Connector's rsync transmission supports specifying users (#8236)https://github.com/apache/seatunnel/commit/e012bd0a42.3.9
[Feature][Clickhouse] Support sink savemode (#8086)https://github.com/apache/seatunnel/commit/e6f92fd792.3.9
[Improve][dist]add shade check rule (#8136)https://github.com/apache/seatunnel/commit/51ef800012.3.9
[Fix][Connecotr-V2] Fix clickhouse sink does not support composite primary key (#8021)https://github.com/apache/seatunnel/commit/24d0542592.3.9
[Improve] update clickhouse connector, use factory to create source/sink (#7946)https://github.com/apache/seatunnel/commit/b69fcecee2.3.9
[Fix][Connector-V2] Fixed clickhouse connectors cannot stop under multiple parallelism (#7921)https://github.com/apache/seatunnel/commit/8d9c6a3712.3.9
Bump commons-io:commons-io from 2.11.0 to 2.14.0 in /seatunnel-connectors-v2/connector-clickhouse (#7784)https://github.com/apache/seatunnel/commit/f4393a02b2.3.9
[Feature][Restapi] Allow metrics information to be associated to logical plan nodes (#7786)https://github.com/apache/seatunnel/commit/6b7c53d032.3.9
[Improve] Improve some connectors prepare check error message (#7465)https://github.com/apache/seatunnel/commit/6930a25ed2.3.8
[Improve][Connector-V2] Close all ResultSet after used (#7389)https://github.com/apache/seatunnel/commit/853e973212.3.8
[Feature][Connector-V2][Clickhouse] Add clickhouse.config to the source connector (#7143)https://github.com/apache/seatunnel/commit/f7994d9ae2.3.6
[Improve] Make ClickhouseFileSinker support tables containing materialized columns (#6956)https://github.com/apache/seatunnel/commit/87c6adcc22.3.6
[Improve][Clickhouse] Remove check when set allow_experimental_lightweight_delete false(#6727) (#6728)https://github.com/apache/seatunnel/commit/b25e1b1ae2.3.6
[Improve][Common] Adapt FILE_OPERATION_FAILED to CommonError (#5928)https://github.com/apache/seatunnel/commit/b3dc0bbc22.3.4
[Improve][Connector-V2] Replace CommonErrorCodeDeprecated.JSON_OPERATION_FAILED (#5978)https://github.com/apache/seatunnel/commit/456cd17712.3.4
[Feature][Core] Upgrade flink source translation (#5100)https://github.com/apache/seatunnel/commit/5aabb14a92.3.4
[Improve] Speed up ClickhouseFile Local generate a mmap object (#5822)https://github.com/apache/seatunnel/commit/cf39e29da2.3.4
[Improve][Common] Introduce new error define rule (#5793)https://github.com/apache/seatunnel/commit/9d1b2582b2.3.4
[Improve] Remove use SeaTunnelSink::getConsumedType method and mark it as deprecated (#5755)https://github.com/apache/seatunnel/commit/8de7408102.3.4
[Hotfix][connector-v2][clickhouse] Fixed an out-of-order BUG with output data fields of clickhouse-sink (#5346)https://github.com/apache/seatunnel/commit/fce9ddaa22.3.4
[Bugfix][Clickhouse] Fix clickhouse sink flush bug (#5448)https://github.com/apache/seatunnel/commit/cef03f6672.3.4
[Hotfix][Clickhouse] Fix clickhouse old version compatibility (#5326)https://github.com/apache/seatunnel/commit/1da49f5a22.3.4
[Improve][CheckStyle] Remove useless 'SuppressWarnings' annotation of checkstyle. (#5260)https://github.com/apache/seatunnel/commit/51c0d709b2.3.4
[Hotfix] Fix com.google.common.base.Preconditions to seatunnel shade one (#5284)https://github.com/apache/seatunnel/commit/ed5eadcf72.3.3
[Feature][Connector-V2][Clickhouse] Add clickhouse connector time zone key,default system time zone (#5078)https://github.com/apache/seatunnel/commit/309b58d122.3.3
[Bugfix]fix clickhouse source connector read Nullable() type is not null,example:Nullable(Float64) while value is null the result is 0.0 (#5080)https://github.com/apache/seatunnel/commit/cf3d0bba22.3.3
[Feature][Connector-V2][Clickhouse] clickhouse writes with checkpoints (#4999)https://github.com/apache/seatunnel/commit/f8fefa1e52.3.3
[Hotfix][Connector-V2][ClickhouseFile] Fix ClickhouseFile write file failed when field value is null (#4937)https://github.com/apache/seatunnel/commit/06671474c2.3.3
[Hotfix][connector-clickhouse] fix get clickhouse local table name with closing bracket from distributed table engineFull (#4710)https://github.com/apache/seatunnel/commit/e5e0cba262.3.2
[Bug][Connector-V2] Clickhouse File Connector failed to sink to table with settings like storage_policy (#4172)https://github.com/apache/seatunnel/commit/e120dc44b2.3.1
[Improve][build] Give the maven module a human readable name (#4114)https://github.com/apache/seatunnel/commit/d7cd601052.3.1
[Improve][Project] Code format with spotless plugin. (#4101)https://github.com/apache/seatunnel/commit/a2ab166562.3.1
[Bug][Connector-V2] Clickhouse File Connector not support split mode for write data to all shards of distributed table (#4035)https://github.com/apache/seatunnel/commit/3f1dcfc912.3.1
[Hotfix][Connector-V2] Fix connector source snapshot state NPE (#4027)https://github.com/apache/seatunnel/commit/e39c4988c2.3.1
[Hotfix][Connector-v2][Clickhouse] Fix clickhouse write cdc changelog update event (#3951)https://github.com/apache/seatunnel/commit/67e6027972.3.1
[Feature][shade][Jackson] Add seatunnel-jackson module (#3947)https://github.com/apache/seatunnel/commit/5d8862ec92.3.1
[Improve][Connector-V2][Clickhouse] Improve performance (#3910)https://github.com/apache/seatunnel/commit/aeceb855f2.3.1
[Improve][Connector-V2] Remove Clickhouse Fields Config (#3826)https://github.com/apache/seatunnel/commit/74704c3622.3.1
[Improve][Connector-V2][clickhouse] Special characters in column names are supported (#3881)https://github.com/apache/seatunnel/commit/9069609c12.3.1
[Feature][Connector] add get source method to all source connector (#3846)https://github.com/apache/seatunnel/commit/417178fb82.3.1
[Improve][Connector-V2] Change Connector Custom Config Prefix To Map (#3719)https://github.com/apache/seatunnel/commit/ef1b8b1bb2.3.1
[Feature][API & Connector & Doc] add parallelism and column projection interface (#3829)https://github.com/apache/seatunnel/commit/b9164b8ba2.3.1
[Bug][Connector-V2] Fix ClickhouseFile Committer Serializable Problems (#3803)https://github.com/apache/seatunnel/commit/1b26192cb2.3.1
[feature][connector-v2][clickhouse] Support write cdc changelog event in clickhouse sink (#3653)https://github.com/apache/seatunnel/commit/6093c213b2.3.0
[Connector-V2][Clickhouse] Improve Clickhouse File Connector (#3416)https://github.com/apache/seatunnel/commit/e07e9a7cc2.3.0
[Hotfix][OptionRule] Fix option rule about all connectors (#3592)https://github.com/apache/seatunnel/commit/226dc6a112.3.0
[Improve][Connector-V2][Clickhouse] Unified exception for Clickhouse source & sink connector (#3563)https://github.com/apache/seatunnel/commit/04e1743d92.3.0
options in conditional need add to required or optional options (#3501)https://github.com/apache/seatunnel/commit/51d5bcba12.3.0
[Feature][Connector-V2][Clickhouse]Optimize clickhouse connector data type inject (#3471)https://github.com/apache/seatunnel/commit/9bd0fc8ee2.3.0
[improve][connector-v2][clickhouse] Fix DoubleInjectFunction (#3441)https://github.com/apache/seatunnel/commit/9781a6a382.3.0
[feature][api] add option validation for the ReadonlyConfig (#3417)https://github.com/apache/seatunnel/commit/4f824fea32.3.0
[improve][connector] The Factory#factoryIdentifier must be consistent with PluginIdentifierInterface#getPluginName (#3328)https://github.com/apache/seatunnel/commit/d9519d6962.3.0
[Improve][Connector-V2] Add Clickhouse and Assert Source/Sink Factory (#3306)https://github.com/apache/seatunnel/commit/9e4a128382.3.0
[Improve][Clickhouse-V2] Clickhouse Support Geo type (#3141)https://github.com/apache/seatunnel/commit/01cdc4e332.3.0
[Improve][Connector-V2][Clickhouse] Support nest type and array (#3047)https://github.com/apache/seatunnel/commit/97b5727ec2.3.0
[Feature][Connector-V2-Clickhouse] Clickhouse Source random use host when config multi-host (#3108)https://github.com/apache/seatunnel/commit/c9583b7f62.3.0-beta
[Improve][Clickhouse-V2] Clickhouse Support Int128,Int256 Type (#3067)https://github.com/apache/seatunnel/commit/e118ccea02.3.0-beta
[Improve][all] change Log to @Slf4j (#3001)https://github.com/apache/seatunnel/commit/6016100f12.3.0-beta
[Connector-V2][Clickhouse] Fix Clickhouse Type Mapping and Spark Map reconvert Bug (#2767)https://github.com/apache/seatunnel/commit/f0a1f50132.2.0-beta
[DEV][Api] Replace SeaTunnelContext with JobContext and remove singleton pattern (#2706)https://github.com/apache/seatunnel/commit/cbf82f7552.2.0-beta
[#2606]Dependency management split (#2630)https://github.com/apache/seatunnel/commit/fc047be692.2.0-beta
[Feature][Connector-V1 & V2] Support unauthorized ClickHouse (#2393)https://github.com/apache/seatunnel/commit/0e4e2b1232.2.0-beta
[Feature][connector] clickhousefile sink connector support non-root username for fileTransfer (#2263)https://github.com/apache/seatunnel/commit/704661f1f2.2.0-beta
StateT of SeaTunnelSource should extend Serializable (#2214)https://github.com/apache/seatunnel/commit/8c426ef852.2.0-beta
[Bug][connector-v2] When outputting data to clickhouse, a ClassCastException was encountered (#2160)https://github.com/apache/seatunnel/commit/a3a2b5d182.2.0-beta
[API-DRAFT][MERGE] fix merge errorhttps://github.com/apache/seatunnel/commit/736ac01c82.2.0-beta
merge dev to api-drafthttps://github.com/apache/seatunnel/commit/d265597c62.2.0-beta
[api-draft][connector] support Rsync to transfer clickhouse data file (#2080)https://github.com/apache/seatunnel/commit/02a41902a2.2.0-beta
[api-draft][Optimize] Optimize module name (#2062)https://github.com/apache/seatunnel/commit/f79e3112b2.2.0-beta