3. Validate the Tez Installation

Use the following procedure to run an example Tez application, such as OrderedWordCount, and validate your Tez installation.

Create a sample test.txt file:
```
foo
bar
foo
bar
foo
```
Log in as the $HDFS_USER. The $HDFS_USER is the user that owns the HDFS service. For example, hdfs:
```
su $HDFS_USER
```
Upload the test.txt file into HDFS:
```
hadoop fs -put test.txt /tmp/test.txt
```
Execute the following command to run the OrderedWordCount application using Tez:
```
hadoop jar /usr/lib/tez/tez-mapreduce-examples-*.jar orderedwordcount /tmp/test.txt /tmp/out
```
Run the following command to verify the word count:
```
hadoop fs -cat '/tmp/out/*'
```
This should return:
```
foo 3
bar 2
```