Replicate Multiple Cassandra Accounts

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CData Sync



Replicate multiple Cassandra accounts to one or many databases.

CData Sync for Cassandra is a stand-alone application that provides solutions for a variety of replication scenarios such as replicating sandbox and production instances into your database. Both Sync for Windows and Sync for Java include a command-line interface (CLI) that makes it easy to manage multiple Cassandra connections. In this article we show how to use the CLI to replicate multiple Cassandra accounts.

Configure Cassandra Connections

You can save connection and email notification settings in an XML configuration file. To replicate multiple Cassandra accounts, use multiple configuration files. Below is an example configuration to replicate Cassandra to SQLite:

Windows

<?xml version="1.0" encoding="UTF-8" ?> <CDataSync> <DatabaseType>SQLite</DatabaseType> <DatabaseProvider>System.Data.SQLite</DatabaseProvider> <ConnectionString>Database=MyCassandraDB;Port=7000;Server=127.0.0.1;</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>Database=MyCassandraDB;Port=7000;Server=127.0.0.1;</ConnectionString> <ReplicateAll>False</ReplicateAll> <NotificationUserName></NotificationUserName> <DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString> </CDataSync>

Set the Server, Port, and Database connection properties to connect to Cassandra. Additionally, to use internal authentication set the User and Password connection properties.

Configure Queries for Each Cassandra Instance

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 Cassandra API. The statement below caches and incrementally updates a table of Cassandra data:

REPLICATE Customer;

You can specify a file containing the replication queries you want to use to update a particular database. Separate replication statements with semicolons. The following options are useful if you are replicating multiple Cassandra accounts into the same database:

You can use a different table prefix in the REPLICATE SELECT statement:

REPLICATE PROD_Customer SELECT * FROM Customer

Alternatively, you can use a different schema:

REPLICATE PROD.Customer SELECT * FROM Customer

Run Sync

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

Windows

CassandraSync.exe -g MyProductionCassandraConfig.xml -f MyProductionCassandraSync.sql

Java

java -Xbootclasspath/p:c:\sqlitejdbc.jar -jar CassandraSync.jar -g MyProductionCassandraConfig.xml -f MyProductionCassandraSync.sql