Sink data from RisingWave to StarRocks

This guide describes how to sink data from RisingWave to StarRocks.

StarRocks is an open-source, massively parallel processing (MPP) database. For details on how to get started with StarRocks, see the Quick start guide.

The StarRocks stream load does not support sinking struct type.

Prerequisites

Before sinking data from RisingWave to StarRocks, please ensure the following:

• The StarRocks database you want to sink to is accessible from RisingWave.
• Ensure you have an upstream materialized view or source in RisingWave that you can sink data from.

Syntax

CREATE SINK [ IF NOT EXISTS ] sink_name
[FROM sink_from | AS select_query]
WITH (
   connector='starrocks',
   connector_parameter = 'value', ...
);

Parameters

All parameters are required unless specified otherwise.

Parameter names	Description
starrocks.host	The StarRocks host address.
starrocks.query_port	The port to the MySQL server of the StarRocks frontend.
starrocks.http_port	The port to the HTTP server of the StarRocks frontend.
starrocks.user	The user name used to access the StarRocks database.
starrocks.password	The password associated with the user.
starrocks.database	The StarRocks database where the target table is located
starrocks.table	The StarRocks table you want to sink data to.
starrocks.partial_update	Optional. If you set the value to "true", the partial update optimization feature of StarRocks will be enabled. This feature enhances ingestion performance in scenarios where there is a need to update a large number of rows with only a small number of columns. You can learn more about this feature in the partial update optimization section of the StarRocks documentation.
type	Data format. Allowed formats: append-only: Output data with insert operations. upsert: Output data as a chagelog stream. In StarRocks, Primary Key table must be selected.
force_append_only	If true, forces the sink to be append-only, even if it cannot be.
primary_key	Required if type is upsert. The primary key of the downstream table.

Examples

Assume we have a materialized view, bhv_mv.

CREATE SINK bhv_starrocks_sink
FROM bhv_mv WITH (
    connector = 'starrocks',
    type = 'append-only',
    starrocks.host = 'starrocks-fe',
    starrocks.mysqlport = '9030',
    starrocks.httpport = '8030',
    starrocks.user = 'users',
    starrocks.password = '123456',
    starrocks.database = 'demo',
    starrocks.table = 'demo_bhv_table',
    force_append_only='true'
);

Data type mapping

The following table shows the corresponding data type in RisingWave that should be specified when creating a sink. For details on native RisingWave data types, see Overview of data types.

StarRocks type	RisingWave type
BOOLEAN	BOOLEAN
SMALLINT	SMALLINT
INT	INTEGER
BIGINT	BIGINT
FLOAT	REAL
DOUBLE	DOUBLE
DECIMAL	DECIMAL
DATE	DATE
VARCHAR	VARCHAR
No support	TIME
DATETIME	TIMESTAMP WITHOUT TIME ZONE
No support	TIMESTAMP WITH TIME ZONE（Can be converted to timestamp in RisingWave then sinked into StarRocks ）
No support	INTERVAL
No support	STRUCT
ARRAY	ARRAY
No support	BYTEA
JSON	JSONB
BIGINT	SERIAL

note

Before v1.9, when inserting data into a StarRocks sink, an error would be reported if the values were "nan (not a number)", "inf (infinity)", or "-inf (-infinity)". Since v1.9, we have made a change to the behavior. If a decimal value is out of bounds or represents "inf", "-inf", or "nan", we will insert null values.