1. Introduction  
2. What is MapReduce?  
3. Hadoop Ecosystem  
4. Hadoop Distributed File System (HDFS)  
5. HDFS Failures and Optimization  
6. Hadoop Scheduler  
7. Hadoop on Cloud, Grid and GPU  
8. Security  
9. Integrated Execution Platform and Hadoop Usages  
10. Hadoop Problems and Challenges  
11. Conclusion