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Replicate Multiple Impala Accounts


Replicate multiple Impala accounts to one or many databases.

CData Sync for Impala 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 Impala connections. In this article we show how to use the CLI to replicate multiple Impala accounts.

Configure Impala Connections

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

Windows

<?xml version="1.0" encoding="UTF-8" ?> <CDataSync> <DatabaseType>SQLite</DatabaseType> <DatabaseProvider>System.Data.SQLite</DatabaseProvider> <ConnectionString>Server=127.0.0.1;Port=21050;</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>Server=127.0.0.1;Port=21050;</ConnectionString> <ReplicateAll>False</ReplicateAll> <NotificationUserName></NotificationUserName> <DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString> </CDataSync>

In order to connect to Apache Impala, set the Server, Port, and ProtocolVersion. You may optionally specify a default Database. To connect using alternative methods, such as NOSASL, LDAP, or Kerberos, refer to the online Help documentation.

Configure Queries for Each Impala 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 Impala API. The statement below caches and incrementally updates a table of Impala data:

REPLICATE Customers;

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 Impala accounts into the same database:

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

REPLICATE PROD_Customers SELECT * FROM Customers

Alternatively, you can use a different schema:

REPLICATE PROD.Customers SELECT * FROM Customers

Run Sync

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

Windows

ApacheImpalaSync.exe -g MyProductionApacheImpalaConfig.xml -f MyProductionApacheImpalaSync.sql

Java

java -Xbootclasspath/p:c:\sqlitejdbc.jar -jar ApacheImpalaSync.jar -g MyProductionApacheImpalaConfig.xml -f MyProductionApacheImpalaSync.sql

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