Exporting Data to a File with Kafka Connect

30 minutes
  • 2 Learning Objectives

About this Hands-on Lab

Kafka Connect provides several connectors to help you move data to and from a variety of external sources. In this lab, you will implement a basic connector to copy Kafka data to a file on the local disk. This simple exercise will give you some hands-on experience interacting with Kafka Connect, and this introduction will prepare you to work with more advanced use cases.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Create a Connector to Export Data from the `inventory_purchases` Topic to a File
  1. Create a FileStreamSinkConnector:

    curl -X POST http://localhost:8083/connectors -H "Content-Type: application/json" -d '{
    "name": "file_sink",
    "config": {
      "connector.class": "org.apache.kafka.connect.file.FileStreamSinkConnector",
      "tasks.max": "1",
      "file": "/home/cloud_user/output/output.txt",
      "topics": "inventory_purchases",
      "key.converter": "org.apache.kafka.connect.storage.StringConverter",
      "value.converter": "org.apache.kafka.connect.storage.StringConverter"
    }
    }'
  1. We should see data from the topic appearing in the output file:

    cat /home/cloud_user/output/output.txt
Publish a New Purchase of Plums to the `inventory_purchases` Topic
  1. Start up a console producer:

    kafka-console-producer --broker-list localhost:9092 --topic inventory_purchases
  2. Publish some data representing a purchase of plums:

    plums:5
  3. Check the file and verify that the purchase of plums shows up in the file data:

    cat /home/cloud_user/output/output.txt

    Note: It may take a few moments for the connector to process the new data.

Additional Resources

Your supermarket company is using Kafka to manage some data. They want to export data from a topic to a data file on the disk for analysis. You have been asked to set up a connector to automatically export records from the inventory_purchases topic to a file located at /home/cloud_user/output/output.txt.

Use the following information as you implement a solution:

  • The connector class org.apache.kafka.connect.file.FileStreamSinkConnector can be used to export data to a file.
  • Set the number of tasks to 1.
  • The data in the topic is string data, so use org.apache.kafka.connect.storage.StringConverter for key.converter and value.converter.

Here is an example of a connector configuration for a FileStream Sink Connector:

"connector.class": "org.apache.kafka.connect.file.FileStreamSinkConnector",
"tasks.max": "1",
"file": "<file path>",
"topics": "<topic>",
"key.converter": "<key converter>",
"value.converter": "<value converter>"

Once you have set up the connector, publish a new record to the topic for a purchase of plums:

kafka-console-producer --broker-list localhost:9092 --topic inventory_purchases

plums:5

Check the file to verify that the new record appears:

cat /home/cloud_user/output/output.txt

If you get stuck, feel free to check out the solution video, or the detailed instructions under each objective. Good luck!

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