Preparing the Cloudera Impala Environment

How to:

Configure the Java CLASSPATH

The following components are needed to use the adapter for Hadoop/Hive/Impala:

Java. To use this JDBC-based adapter, you must have Java installed. Hadoop requires Version 1.7 or later. Java can be downloaded from http://www.java.com.
The location of Java must be specified in an environment variable.

If you are using Linux, add a line to your profile with the location where Java is installed. For example:
```
export JAVA_HOME=/usr/lib/jvm/jre-1.7.0
```
If you have JDK installed:
```
export JAVA_HOME=/usr/lib/jvm/jdk-1.7.0
```
If you are using Windows, right-click Computer and click Properties. Then click Advanced System Settings and click Environment Variables. Add the locations to your PATH variable. For example:
```
C:\Program Files\Java\jdk7\bin\server;C:\Program Files\Java\jdk7\bin;
```
JDBC Driver. The JDBC driver requires a collection of jar files. If you are using the Apache Hive JDBC driver, they are included in CDH. If you are installing the server on the same system where Hive is installed, you can point to the jar files as described in the next section. If you are installing the server on some other system, copy those files to a location of your choice. If you are using the Cloudera Impala JDBC driver, download as described below.

Procedure: How to Configure the Java CLASSPATH

The location of the JDBC driver jar files must be specified to the server. If you are running the server on the same system as the Impala server, you can specify their location. If you are running the server on another system, copy the files listed below to a location on your system and specify their location.

This can be done in the system CLASSPATH or in the DataMigrator or WebFOCUS Reporting Server IBI_CLASSPATH variable as follows:

From the Web Console menu bar, click Workspace

or

From the Data Management Console, expand the Workspace folder.
Expand the Java Services folder. Right-click DEFAULT and click Properties.

The Java Services Configuration page opens.
Click the chevrons to expand Class Path.
In the IBI_CLASSPATH box, enter the full location of the Hive and Hadoop files shown below, where hive_home is where Hive is installed and hadoop_home is where Hadoop is installed. You must type them explicitly and cannot use $HIVE_HOME. The file names must be entered one per line.

If you are installing the adapter on a different system than where Hadoop and Hive are installed, copy the jar files to a location on that system.
Note: For a server running on Windows, use Windows syntax for directory names. For example:
```
C:\jdbc\hive-jdbc-1.2.0-standalone.jar
```
For the Apache Hive JDBC Driver:
```
/hive_home/lib/hive-jdbc-standalone.jar
/hadoop_home/hadoop-common.jar
```
If your Hive server is Kerberos enabled, also add:
```
/hadoop_home/client/hadoop-auth.jar
```
For Cloudera Impala

Download the JDBC driver from Cloudera. Go to the Downloads page at http://www.cloudera.com/downloads.html.

Click the link for Impala JDBC Driver downloads. For your operating system, select your OS Version and click the Download Now link.

This will download a file called impala_jdbc_2.5.34.zip (the numbers will change with new releases). It contains two more .zip files. Unzip the file Cloudera_Impala_JDBC41_2.5.34.zip to a location on your system (the 41 in the name indicates JDBC 4.1, which supports Java 1.7 or later). These 15 jar files constitute the Cloudera Impala JDBC driver.

Add the names of all of them to your CLASSPATH or IBI_CLASSPATH as described above.
Scroll down and click the Save and Restart Java Services button.