Downloading and Configuring the Driver

This topic provides instructions for downloading and configuring the Drill JDBC driver for SQuirreL.

About this task

When you configure the driver, you define the driver and create an alias. The alias is a specific instance of the driver configuration. SQuirreL uses the driver definition and alias to connect to Drill so you can access data sources that you have registered with Drill. When you create the alias, you provide a connection URL that includes the name of the Drill directory stored in ZooKeeper and the cluster ID. The URL has the following format:

jdbc:drill:zk=<zookeeper_quorum>/<drill_directory_in_zookeeper>/<cluster_ID>

The following example shows a URL for Drill installed on a single node:

jdbc:drill:zk=10.10.100.56:5181/drill/demo_mapr_com-drillbits
jdbc:drill:zk=10.10.100.24:2181/drill/drillbits1

The following example shows a URL for Drill installed in distributed mode with a connection to a ZooKeeper quorum:

jdbc:drill:zk=10.10.100.30:5181,10.10.100.31:5181,10.10.100.32:5181/drill/drillbits1

NOTE

The ZooKeeper port is 2181. In a MapR cluster, the ZooKeeper port is 5181.
The Drill directory stored in ZooKeeper is /drill.

The Drill default cluster ID is drillbits1. To determine the cluster ID, check the following file:

<drill-installation>/conf/drill-override.conf

For example:

... drill.exec: { cluster-id: "docs41cluster-drillbits", zk.connect: "centos23.lab:5181,centos28.lab:5181,centos29.lab:5181" } ...

To use the Drill JDBC driver with SQuirreL, complete the following steps:

Procedure

Download the latest Drill JDBC Driver and then unzip the file. The Drill JDBC Driver JAR files must exist in a directory on your machine before you can configure the driver in the SQuirreL client.
If using the MapR-SASL or Plain authentication mechanism, add the Drill JDBC JAR files and /opt/mapr/lib/* to Squirrel’s classpath, as shown in the following example when the path to the driver is C:\driver\MapRDrillJDBC41-1.5.6.1012:
```
-cp "%SQUIRREL_CP%;C:\driver\MapRDrillJDBC41-1.5.6.1012\*;C:\opt\mapr\lib\*"
```
NOTE The driver JAR files should appear before /opt/mapr/lib/* in the classpath.
Define the driver.
1. Open the SQuirreL client.
2. In the SQuirreL toolbar, select Drivers > New Driver. The Add Driver dialog appears.
3. Enter the following information:
  - Name - Name for the Drill JDBC Driver
  - Example URL - jdbc:drill:zk=<zookeeper_quorum>
    Example: jdbc:drill:zk=maprdemo:5181
  - Website URL - jdbc:drill:zk=<zookeeper_quorum>
    Example: jdbc:drill:zk=maprdemo:5181
    Example: jdbc:drill:zk=10.10.100.113:5181,10.10.100.115:5181
4. Select Extra Class Path, and click Add.
5. Navigate to the directory that contains the JDBC JAR files.
6. Select all of the files in the directory, and click Choose.
7. In the Class Name drop-down field, select the driver class. For driver version 1.6.6.1009 and earlier, select com.mapr.drill.jdbc41.Driver or type com.mapr.drill.jdbc41.Driver in the field if the option does not appear. For driver version 1.6.7.1010, select com.mapr.drill.jdbc.Driver or type com.mapr.drill.jdbc.Driver in the field if the option does not appear.
8. Click Ok. The SQuirreL client displays a message stating that the driver registration is successful, and you can see the driver in the Drivers panel.
Create a database alias.
1. Select the Aliases tab.
2. In the SQuirreL toolbar, select Aliases > New Alias. The Add Alias dialog box appears.
3. Enter the following information and click Ok.
  - Alias Name - A unique name for the Drill JDBC Driver alias
  - Driver - Select the Drill JDBC Driver
  - URL - Enter the connection URL with the name of the Drill directory stored in ZooKeeper and the cluster ID.
  - User Name - admin
  - Password - admin
  The Connect to: dialog appears.
4. Click Connect. SQuirreL displays a message stating that the connection is successful.
5. Click Ok. SQuirrel is connected to Drill through the Drill JDBC driver. You can run your queries.