Chapter 4. YARN and Hadoop Ecosystems
This chapter discusses YARN with respect to Hadoop, since it is very important to know where exactly YARN fits in Hadoop 2 now.
Hadoop 2 has undergone a complete change in terms of architecture and components compared to Hadoop 1.
In this chapter, we will be cover the following topics:
- A short introduction to Hadoop 1
- The difference between MRv1 and MRv2
- Where YARN fits in Hadoop 2
- Old and new MapReduce APIs
- Backward compatibility of MRv2 APIs
- Practical examples of MRv1 and MRv2
