5. Smoke Test MapReduce

Try browsing to the ResourceManager:
```
http://$resourcemanager.full.hostname:8088/
```
Create a $CLIENT_USER in all the nodes and add it in users group.
```
useradd client
usermod -a -G users client
```

As the HDFS user, create a /user/$CLIENT_USER.

sudo su $HDFS_USER 
hdfs dfs -mkdir /user/$CLIENT_USER 
hdfs dfs -chown $CLIENT_USER:$CLIENT_USER /user/$CLIENT_USER 
hdfs dfs -chmod -R 755 /user/$CLIENT_USER

Run the smoke test as the $CLIENT_USER, using Terasort and sort 10GB of data.

su $CLIENT_USER 
/usr/lib/hadoop/bin/hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples-*.jar teragen 10000 /tmp/teragenout 
/usr/lib/hadoop/bin/hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples-*.jar terasort /tmp/teragenout /tmp/terasortout

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