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Connect to Impala Data from a Connection Pool in Jetty


The Impala JDBC Driver supports connection pooling: This article shows how to connect faster to Impala data from Web apps in Jetty.

The CData JDBC driver for Impala is easy to integrate with Java Web applications. This article shows how to efficiently connect to Impala data in Jetty by configuring the driver for connection pooling. You will configure a JNDI resource for Impala in Jetty.

Configure the JDBC Driver for Salesforce as a JNDI Data Source

Follow the steps below to connect to Salesforce from Jetty.

  1. Enable the JNDI module for your Jetty base. The following command enables JNDI from the command-line:

    java -jar ../start.jar --add-to-startd=jndi
  2. Add the CData and license file, located in the lib subfolder of the installation directory, into the lib subfolder of the context path.

  3. Declare the resource and its scope. Enter the required connection properties in the resource declaration. This example declares the Impala data source at the level of the Web app, in WEB-INF\jetty-env.xml.

    <Configure id='impalademo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="impalademo" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg><Ref refid="impalademo"/></Arg> <Arg>jdbc/impaladb</Arg> <Arg> <New class="cdata.jdbc.apacheimpala.ApacheImpalaDriver"> <Set name="url">jdbc:apacheimpala:</Set> <Set name="Server">127.0.0.1</Set> <Set name="Port">21050</Set> </New> </Arg> </New> </Configure>

    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.

  4. Configure the resource in the Web.xml:

    jdbc/impaladb javax.sql.DataSource Container

  5. You can then access Impala with a lookup to java:comp/env/jdbc/impaladb: InitialContext ctx = new InitialContext(); DataSource myimpala = (DataSource)ctx.lookup("java:comp/env/jdbc/impaladb");

More Jetty Integration

The steps above show how to configure the driver in a simple connection pooling scenario. For more use cases and information, see the Working with Jetty JNDI chapter in the Jetty documentation.