Finally, you will need to learn how to develop MapReduce applications. You should complete this course series, and pay special attention to the lab activities:
- DEV 300 - Build Hadoop MapReduce Applications
- DEV 301 - Manage and Test Hadoop MapReduce Applications
- DEV 302 - Launch Jobs and Advanced Hadoop MapReduce
Completing the instructor-led DEV 3000 - Developing Hadoop Applications course is also recommended, if possible.
You can also read the MCHD Study Guide - MapR Certified Hadoop Developer.