This post more to test idea feature than pushing a revolutionnary idea ... i admit.
In DEV301 material most of command line path, sh script content, ... are using old hadoop path not matching path of current hadoop version on last sandbox (5.1) :
hadoop jar /opt/mapr/hadoop/hadoop-2.5.1/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.1-mapr-1503.jar wordcount /user/user01/1.1/IN1 /user/user01/1.1/OUT1
hadoop jar /opt/mapr/hadoop/hadoop-2.7.0/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.0-mapr-1602.jar wordcount /user/user01/1.1/IN1 /user/user01/1.1/OUT1
Lab exercices could be used with out this update but would be nice to have it up to date.