12. Upgrade Mahout

Upgrade Mahout. On the Mahout client machines, execute the following command:

For SLES:

zypper remove mahout
zypper se -s mahout

You should see Mahout in the output. Install Mahout:

zypper install mahout

	Important
	When removing and installing packages, rename those files the `/conf` directory that have `.rpmsave` extension to original to retain the customized configs. Alternatively, you can also use the configuration files (under the `/conf` directory) you backed up before upgrading.

For Ubuntu or Debian:
```
apt-get install mahout
```
You must replace your configuration after upgrading. Copy /etc/mahout/conf from the template to the conf directory in mahout hosts.

To validate mahout:

Create a test user:

hadoop fs -put /tmp/sample-test.txt /user/testuser

Create a mahout test output directory:

hadoop fs -mkdir /user/testuser/mahouttest

Set up mahout to convert the plain text file sample-test.txt into a sequence file that is in the output directory mahouttest.
```
mahout seqdirectory --input /user/testuser/sample-test.txt --output /user/testuser/mahouttest --charset utf-8 
```