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Connect to Presto Data from a Connection Pool in Jetty


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

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

    <Configure id='prestodemo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="prestodemo" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg><Ref refid="prestodemo"/></Arg> <Arg>jdbc/prestodb</Arg> <Arg> <New class="cdata.jdbc.presto.PrestoDriver"> <Set name="url">jdbc:presto:</Set> <Set name="Server">127.0.0.1</Set> <Set name="Port">8080</Set> </New> </Arg> </New> </Configure>

    Set the Server and Port connection properties to connect, in addition to any authentication properties that may be required.

    To enable TLS/SSL, set UseSSL to true.

    Authenticating with LDAP

    In order to authenticate with LDAP, set the following connection properties:

    • AuthScheme: Set this to LDAP.
    • User: The username being authenticated with in LDAP.
    • Password: The password associated with the User you are authenticating against LDAP with.

    Authenticating with Kerberos

    In order to authenticate with KERBEROS, set the following connection properties:

    • AuthScheme: Set this to KERBEROS.
    • KerberosKDC: The Kerberos Key Distribution Center (KDC) service used to authenticate the user.
    • KerberosRealm: The Kerberos Realm used to authenticate the user with.
    • KerberosSPN: The Service Principal Name for the Kerberos Domain Controller.
    • KerberosKeytabFile: The Keytab file containing your pairs of Kerberos principals and encrypted keys.
    • User: The user who is authenticating to Kerberos.
    • Password: The password used to authenticate to Kerberos.

  4. Configure the resource in the Web.xml:

    jdbc/prestodb javax.sql.DataSource Container

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

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.