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URL: https://www.cdata.com/kb/tech/kafka-sync-multiple-databases.rst

⇱ Replicate Kafka Data to Multiple Databases via the CData Sync CLI

Replicate Kafka Data to Multiple Databases via the CData Sync CLI

👁 Jerod Johnson
Jerod Johnson
Director, Technology Evangelism
Replicate Kafka data to disparate databases with a single configuration.

Always-on applications rely on automatic failover capabilities and real-time access to data. CData Sync for Kafka integrates live Kafka data into your mirrored databases, always-on cloud databases, and other databases such as your reporting server: Automatically synchronize with remote Kafka data from Windows or any machine running Java.

You can use Sync's command-line interface (CLI) to easily control almost all aspects of the replication. You can use the CLI to replicate Kafka data to one or many databases without any need to change your configuration.

Connect to Kafka Data

You can save connection strings and other settings like email notifications in XML configuration files.

The following example shows how to replicate to SQLite.

Windows

<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync><DatabaseType>SQLite</DatabaseType>
 <DatabaseProvider>System.Data.SQLite</DatabaseProvider>
 <ConnectionString>User=admin;Password=pass;BootStrapServers=https://localhost:9091;Topic=MyTopic;</ConnectionString>
 <ReplicateAll>False</ReplicateAll>
 <NotificationUserName></NotificationUserName>
 <DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
 <TaskSchedulerStartTime>09:51</TaskSchedulerStartTime>
 <TaskSchedulerInterval>Never</TaskSchedulerInterval>
</CDataSync>

Java

<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync><DatabaseType>SQLite</DatabaseType><DatabaseProvider>org.sqlite.JDBC</DatabaseProvider>
<ConnectionString>User=admin;Password=pass;BootStrapServers=https://localhost:9091;Topic=MyTopic;</ConnectionString>
<ReplicateAll>False</ReplicateAll>
<NotificationUserName></NotificationUserName>
<DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
</CDataSync>

Set BootstrapServers and the Topic properties to specify the address of your Apache Kafka server, as well as the topic you would like to interact with.

Authorization Mechanisms

  • SASL Plain: The User and Password properties should be specified. AuthScheme should be set to 'Plain'.
  • SASL SSL: The User and Password properties should be specified. AuthScheme should be set to 'Scram'. UseSSL should be set to true.
  • SSL: The SSLCert and SSLCertPassword properties should be specified. UseSSL should be set to true.
  • Kerberos: The User and Password properties should be specified. AuthScheme should be set to 'Kerberos'.

You may be required to trust the server certificate. In such cases, specify the TrustStorePath and the TrustStorePassword if necessary.

Configure Replication Queries

Sync enables you to control replication with standard SQL. The REPLICATE statement is a high-level command that caches and maintains a table in your database. You can define any SELECT query supported by the Kafka API. The statement below caches and incrementally updates a table of Kafka data: 

REPLICATE SampleTable_1;

You can specify a file containing the replication queries. This enables you to use the same replication queries to replicate to several databases.

Run Sync

After you have configured the connection strings and replication queries, you can run Sync with the following command-line options:

Windows

ApacheKafkaSync.exe -g MySQLiteConfig.xml -f ApacheKafkaSync.sql

Java

java -Xbootclasspath/p:c:\sqlitejdbc.jar -jar ApacheKafkaSync.jar -g MySQLiteConfig.xml -f ApacheKafkaSync.sql