Redis sink connector

note

You can download all the Pulsar connectors on download page.

The Redis sink connector pulls messages from Pulsar topics and persists the messages to a Redis database.

Configuration

The configuration of the Redis sink connector has the following properties.

Property

Name	Type	Required	Default	Description
redisHosts	String	true	" " (empty string)	A comma-separated list of Redis hosts to connect to.
redisPassword	String	false	" " (empty string)	The password used to connect to Redis.
redisDatabase	int	true	0	The Redis database to connect to.
clientMode	String	false	Standalone	The client mode when interacting with Redis cluster. Below are the available options: Standalone Cluster
autoReconnect	boolean	false	true	Whether the Redis client automatically reconnect or not.
requestQueue	int	false	2147483647	The maximum number of queued requests to Redis.
tcpNoDelay	boolean	false	false	Whether to enable TCP with no delay or not.
keepAlive	boolean	false	false	Whether to enable a keepalive to Redis or not.
connectTimeout	long	false	10000	The time to wait before timing out when connecting in milliseconds.
operationTimeout	long	false	10000	The time before an operation is marked as timed out in milliseconds .
batchTimeMs	int	false	1000	The Redis operation time in milliseconds.
batchSize	int	false	200	The batch size of writing to Redis database.

Example

Before using the Redis sink connector, you need to create a configuration file in the path you will start the Pulsar service (PULSAR_HOME) through one of the following methods.

• JSON

  {
     "configs": {
        "redisHosts": "localhost:6379",
        "redisPassword": "mypassword",
        "redisDatabase": "0",
        "clientMode": "Standalone",
        "operationTimeout": "2000",
        "batchSize": "1",
        "batchTimeMs": "1000",
        "connectTimeout": "3000"
     }
  }

• YAML

  configs:
      redisHosts: "localhost:6379"
      redisPassword: "mypassword"
      redisDatabase: 0
      clientMode: "Standalone"
      operationTimeout: 2000
      batchSize: 1
      batchTimeMs: 1000
      connectTimeout: 3000

Usage

This example shows how to write records to a Redis database using the Pulsar Redis connector.

1. Start a Redis server.

   docker pull redis:5.0.5
   docker run -d -p 6379:6379 --name my-redis redis:5.0.5 --requirepass "mypassword"

2. Start a Pulsar service locally in standalone mode.

   bin/pulsar standalone

   Make sure the NAR file is available at connectors/pulsar-io-redis-3.0.4.nar.

3. Start the Pulsar Redis connector in local run mode using one of the following methods.

   • Use the JSON configuration file as shown previously.

   bin/pulsar-admin sinks localrun \
       --archive $PWD/connectors/pulsar-io-redis-3.0.4.nar \
       --tenant public \
       --namespace default \
       --name my-redis-sink \
       --sink-config '{"redisHosts": "localhost:6379","redisPassword": "mypassword","redisDatabase": "0","clientMode": "Standalone","operationTimeout": "3000","batchSize": "1"}' \
       --inputs my-redis-topic

   • Use the YAML configuration file as shown previously.

     bin/pulsar-admin sinks localrun \
         --archive $PWD/connectors/pulsar-io-redis-3.0.4.nar \
         --tenant public \
         --namespace default \
         --name my-redis-sink \
         --sink-config-file $PWD/redis-sink-config.yaml \
         --inputs my-redis-topic

4. Publish records to the topic.

   bin/pulsar-client produce \
       persistent://public/default/my-redis-topic \
       -k "streaming" \
       -m "Pulsar"

5. Start a Redis client in Docker.

   docker exec -it my-redis redis-cli -a "mypassword"

6. Check the key/value in Redis.

   127.0.0.1:6379> keys *
   1) "streaming"
   127.0.0.1:6379> get "streaming"
   "Pulsar"