# Install a driver for the Pentaho Server

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 Pentaho Server.

This task assumes that you have downloaded your driver from the [Hitachi Vantara Lumada and Pentaho Support Portal](https://support.pentaho.com/hc/en-us) or that you are using the Apache Hadoop driver that is shipped with Pentaho.

1. Verify that you are connected to a repository.
2. In the PDI client, select the **View** tab of your transformation or job.
3. Right-click the **Hadoop clusters** folder and click **Add driver**.

   The Add driver dialog box appears.

   ![Add driver dialog box](/files/MbhJcjzEVuldMd1i12b2)
4. Click **Browse**

   The Choose File to Upload dialog box appears.
5. Navigate to the directory where you downloaded your `.kar` file from the Lumada and Pentaho Support Portal.
6. 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)
7. Click **Next**.

   The Congratulations dialog box appears, notifying you that you must restart the Pentaho Server and the PDI client. The installed driver is now available for selection in the **Driver** field in the New cluster and Import cluster dialog boxes.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.pentaho.com/install/9.3-install/pentaho-configuration/tasks-to-be-performed-by-an-it-administrator/set-up-the-pentaho-server-to-connect-to-a-hadoop-cluster/install-a-driver-for-the-pentaho-server.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.