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The Pulsar IO Kafka Connector code can now be found at apache/pulsar/pulsar-io/kafka.

Source documentation: https://pulsar.apache.org/docs/io-kafka-source/

Sink documentation: https://pulsar.apache.org/docs/io-kafka-sink/

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Pulsar IO Kafka Connector

pulsar-io-kafka is a Pulsar IO Connector for copying data between Kafka and Pulsar.

NOTE: This connector is an enhanced version of pulsar-io-kafka connector to support schema.

Get started

This provides a step-by-step example how to use this Kafka source connector to copy json data from a Kafka topic to a Pulsar topic and save the data in AVRO format.

Build pulsar-io-kafka connector

1. Git clone pulsar-io-kafka. Assume PULSAR_IO_KAFKA_HOME is the home directory for your cloned pulsar-io-kafka repo for the remaining steps.

   $ git clone https://github.com/streamnative/pulsar-io-kafka
   

2. Build the connector in ${PULSAR_IO_KAFKA_HOME} directory.

   mvn clean install -DskipTests
   

   After successfully built the connector, a NAR package is generated under target directory. The NAR package is the one you used for

   $ ls target/pulsar-io-kafka-2.5.0-SNAPSHOT.nar
   target/pulsar-io-kafka-2.5.0-SNAPSHOT.nar
   

Prepare a config for running pulsar-io-kafka connector

An example yaml config is available here

This example yaml config is used for copying json data from Kafka topic input-topic to Pulsar topic output-topic and save the messages in AVRO format.

Run pulsar-io-kafka connector

1. Download Pulsar 2.4.0 release from Pulsar website and follow the instructions to start a standalone Pulsar. Assume PULSAR_HOME is the home directory for your Pulsar installation for the remaining steps.

   Example command to start a standalone Pulsar.

   cd ${PULSAR_HOME}
   bin/pulsar standalone
   

2. Download Kafka release from Kafka website and follow the instructions to start a Kafka server. Assume KAFKA_HOME is the home directory for your Kafka installation for the remaining steps.

   Example commands to start a Kafka server.

   cd ${KAFKA_HOME}
   bin/zookeeper-server-start.sh config/zookeeper.properties
   bin/kafka-server-start.sh config/server.properties
   

3. Create a Kafka topic.

   Make sure the Kafka topic name is the one you configured in pulsar-io-kafka.yaml.

   bin/kafka-topics.sh --bootstrap-server 127.0.0.1:9092 --create --topic input-topic --replication-factor 1 --partitions 4
   

4. Copy the pulsar-io-kafka conenctor to ${PULSAR_HOME}/connectors directory.

   cd ${PULSAR_HOME}
   mkdir -p connectors
   cp ${PULSAR_IO_KAFKA_HOME}/target/pulsar-io-kafka-2.5.0-SNAPSHOT.nar connectors/
   

5. Localrun the pulsar-io-kafka connector.

   NOTE: --destination-topic-name is used by pulsar io runtime but not by this pulsar-io-kafka connector. We can not omit this setting at this momement. So you can given any unused topic name for now.

   cd ${PULSAR_HOME}
   bin/pulsar-admin sources localrun -a connectors/pulsar-io-kafka-2.5.0-SNAPSHOT.nar --tenant public --namespace default --name test-kafka-source --source-config-file ${PULSAR_IO_KAFKA_HOME}/conf/pulsar-io-kafka.yaml --destination-topic-name test-kafka-source-topic
   

   Once the connector is running, keep this terminal open during the remaining steps.

6. Now we can use a json kafka producer and an avro pulsar consumer to verify if the connector is working as expected.

   Start a json Kafka producer to produce 100 messages.

   cd ${PULSAR_IO_KAFKA_HOME}
   bin/kafka-json-producer.sh localhost:9092 input-topic 100
   

   Start an avro Pulsar consumer to consume the 100 messages (in avro format).

   cd ${PULSAR_IO_KAFKA_HOME}
   bin/pulsar-avro-consumer.sh pulsar://localhost:6650 output-topic sub
   

   You will see similar output in the terminal you run pulsar-avro-consumer.sh:

   Receive message : key = user-99, value = User(name=user-99, age=990, address=address-99)
   

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