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Sink data from RisingWave to Redis

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

Redis is an open-source, in-memory data structure store, often referred to as a data structure server. RisingWave sinks data to Redis in the form of strings storing key-value pairs in the specified format (JSON or TEMPLATE), so a primary key must always be provided.

You can test out this process on your own device by using the redis-sink demo in the integration_test directory of the RisingWave repository.

Prerequisites

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

  • The Redis 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='redis',
connector_parameter = 'value', ...
)
FORMAT data_format ENCODE data_encode [ (
format_parameter = 'value' ) ]
;

Parameters

Parameter NamesDescription
redis.urlRequired. The address of the Redis database.
primary_keyRequired. The primary keys of the sink. If necessary, use ',' to delimit the primary key columns.

Sink parameters

FieldNotes
data_formatData format. Allowed formats:
  • PLAIN: Output data with insert operations.
  • UPSERT: Output data as a changelog stream.
data_encodeData encoding. Supported encodings:
  • JSON:
    • date: number of days since the Common Era (CE).
    • interval: P<years>Y<months>M<days>DT<hours>H<minutes>M<seconds>S format string.
    • time without time zone: number of milliseconds past the last midnight.
    • timestamp: number of milliseconds since the Epoch.
  • TEMPLATE: converts data to the string specified by redis_key_format/redis_value_format.
force_append_onlyIf true, forces the sink to be PLAIN (also known as append-only), even if it cannot be.
redis_key_formatRequired if data_encode is TEMPLATE. Specify the format for the key as a string.
redis_value_formatRequired if data_encode is TEMPLATE. Specify the format for the value as a string.

Example

Assume we create a materialized view, bhv_mv, from a source.

CREATE MATERIALIZED VIEW bhv_mv AS
SELECT
user_id,
target_id,
event_timestamp
FROM
source_1;

We can sink data from bhv_mv to Redis by creating a sink. Here, data_encode is JSON.

CREATE SINK redis_sink
FROM bhv_mv WITH (
connector = 'redis',
primary_key = 'user_id',
redis.url= 'redis://127.0.0.1:6379/'
) FORMAT PLAIN ENCODE JSON (
force_append_only='true'
);

We can sink data from bhv_mv to Redis by creating a sink. Here, data_encode is TEMPLATE, so redis_key_format and redis_value_format must be defined.

CREATE SINK redis_sink_2
FROM bhv_mv WITH (
primary_key = 'user_id',
connector = 'redis',
redis.url= 'redis://127.0.0.1:6379/',
) FORMAT PLAIN ENCODE TEMPLATE (
force_append_only='true',
redis_key_format = 'UserID:{user_id}',
redis_value_format = 'TargetID:{target_id},EventTimestamp{event_timestamp}'
);
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