Try browsing to the ResourceManager:
http://$resourcemanager.full.hostname:8088/
Smoke test using Terasort and sort 10GB of data.
su $HDFS_USER /usr/lib/hadoop/bin/hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples-2.2.0.2.0.6.0-76.jar teragen 10000 /tmp/teragenout /usr/lib/hadoop/bin/hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples-2.2.0.2.0.6.0-76.jar terasort /tmp/teragenout /tmp/terasortout
