# Install a driver for the PDI client

Before you can add a named connection to a cluster, you must install a driver for the vendor and version of the Hadoop cluster that you are connecting to. Perform the following steps to install a driver for the PDI client:

This task assumes that you are not using the default Hadoop driver and that you have downloaded your vendor-specific driver from the [Hitachi Vantara Lumada and Pentaho Support Portal](https://support.pentaho.com).

1. In the PDI client, select the **View** tab of your transformation or job.
2. Right-click the **Hadoop clusters** folder and click **Add driver**.

   The Add driver dialog box appears.

   ![Add driver dialog box](/files/3jIVrFDd0RRq8WKsaXO7)
3. Click **Browse**

   The Choose File to Upload dialog box appears.
4. Navigate to the location where you downloaded your driver file.
5. Select the driver (`.kar` file) you want to add, click **Open**, and then click **Next**.

   The selected file name appears in the **Browse** text field. The vendor distribution files contain their abbreviations in the `.kar` file names as shown below:

   * Amazon EMR (emr)
   * Azure HDInsight (hdi)
   * Cloudera (cdh)
   * Cloudera Data Platform (cdp)
   * Google Dataproc (dataproc)
   * Hortonworks (hdp)
6. Click **Next**.

   The Congratulations dialog box appears, notifying you that you must restart the Pentaho Server and the PDI client. The **Driver** field in the New cluster and Import cluster dialog boxes now displays the driver you have added.


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