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Connect to HDFS Data from a Connection Pool in Jetty


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

The CData JDBC driver for HDFS is easy to integrate with Java Web applications. This article shows how to efficiently connect to HDFS data in Jetty by configuring the driver for connection pooling. You will configure a JNDI resource for HDFS 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 HDFS data source at the level of the Web app, in WEB-INF\jetty-env.xml.

    <Configure id='hdfsdemo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="hdfsdemo" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg><Ref refid="hdfsdemo"/></Arg> <Arg>jdbc/hdfsdb</Arg> <Arg> <New class="cdata.jdbc.hdfs.HDFSDriver"> <Set name="url">jdbc:hdfs:</Set> <Set name="Host">sandbox-hdp.hortonworks.com</Set> <Set name="Port">50070</Set> <Set name="Path">/user/root</Set> <Set name="User">root</Set> </New> </Arg> </New> </Configure>

    In order to authenticate, set the following connection properties:

    • Host: Set this value to the host of your HDFS installation.
    • Port: Set this value to the port of your HDFS installation. Default port: 50070

  4. Configure the resource in the Web.xml:

    jdbc/hdfsdb javax.sql.DataSource Container

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

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.