Use Kafka Connect to synchronize data from a MySQL database to Message Queue for Apache Kafka

Prerequisites

Before you start this tutorial, make sure that the following operations are completed:

• A MySQL source connector is downloaded.
  Note In this tutorial, MySQL source connector 0.5.2 is used as an example.
• Kafka Connect is downloaded.
  Note In this tutorial, Kafka Connect 0.10.2.2 is used as an example.
• Docker is installed.

Step 1: Configure Kafka Connect

1. Decompress the downloaded MySQL source connector package to the specified directory.
2. In the configuration file connect-distributed.properties of Kafka Connect, specify the plug-in installation path.

   plugin.path=/kafka/connect/plugins

   Notice

   In earlier versions of Kafka Connect, plugin.path cannot be configured, and you must specify the plug-in path in CLASSPATH.

   export CLASSPATH=/kafka/connect/plugins/mysql-connector/*

Step 2: Start Kafka Connect

After connect-distributed.properties is configured, run the following command to start Kafka Connect:

• Access from a VPC

  Run the command bin/connect-distributed.sh config/connect-distributed.properties to start Kafka Connect.

Step 3: Install MySQL

1. Download docker-compose-mysql.yaml.
2. Run the following command to install MySQL:

   export DEBEZIUM_VERSION=0.5
   docker-compose -f docker-compose-mysql.yaml up

Step 4: Configure MySQL

1. Run the following command to enable binary logging for MySQL and set the binary logging mode to row.

   [mysqld]
   log-bin=mysql-bin
   binlog-format=ROW
   server_id=1 

2. Run the following command to grant permissions to the MySQL user:

   GRANT SELECT, RELOAD, SHOW DATABASES, REPLICATION SLAVE, REPLICATION CLIENT ON *. * TO 'debezium' IDENTIFIED BY 'dbz';

   Note In this example, the MySQL user is debezium and the password is dbz.

Step 5: Start the MySQL source connector

1. Download register-mysql.json.
2. Edit register-mysql.json.
   • Access from a VPC

     ##  Message Queue for Apache Kafka  endpoints. You can obtain the endpoints in the Message Queue for Apache Kafka console.
     ## The default endpoint that you obtained in the Message Queue for Apache Kafka console.
     "database.history.kafka.bootstrap.servers" : "kafka:9092",
     ## The topic that you created in the Message Queue for Apache Kafka console. In this example, the topic is server1.
     ## All table change data is recorded in server1. $DATABASE. $TABLE topics, for example, the server1.inventory.products topic.
     ## Therefore, you must create all the related topics in the Message Queue for Apache Kafka console in advance.
     "database.server.name": "server1",
     ## Schema changes are recorded in this topic.
     ## You must create this topic in the console in advance.
     "database.history.kafka.topic": "schema-changes-inventory"

3. After you configure register-mysql.json, you must create the corresponding topics in the Message Queue for Apache Kafka console based on the configuration. For more information about the steps, see Step 1: Create a topic.
   In MySQL that is installed based on this tutorial, database:inventory is created in advance. The database contains the following tables:

   • customers
   • orders
   • products
   • products_on_hand

   Based on the preceding configuration, you must create the following topics by calling the CreateTopic operation:

   • server1
   • server1.inventory.customers
   • server1.inventory.orders
   • server1.inventory.products
   • server1.inventory.products_on_hand

   Based on the configuration in register-mysql.json, schema change information needs to be stored in schema-changes-testDB. Therefore, you must create the schema-changes-inventory topic by calling the CreateTopic operation. For more information about how to create a topic by calling the CreateTopic operation, see CreateTopic.

4. Run the following command to start the MySQL source connector.

   > curl -i -X POST -H "Accept:application/json" -H  "Content-Type:application/json" http://localhost:8083/connectors/ -d @register-mysql.json

Verify the result

Perform the following steps to check whether Message Queue for Apache Kafka can receive change data from MySQL.

1. Modify the data of a table in MySQL.
2. Log on to the Message Queue for Apache Kafka console. On the Message Query page, query the table change data.