8. The Role of the NameNode and How HDFS Works
As you learned in earlier chapters, HDFS is one of the two main architectural pillars of Hadoop 2, the other being YARN. In this chapter, I start off with an explanation of the interaction between the NameNode and the DataNodes and go on to discuss the theory behind how clients read from and write to HDFS. I then discuss HDFS features such as archival storage and HDFS cache management.
This chapter discusses the following topics pertaining to HDFS:
The interaction between the NameNode and the DataNodes
HDFS data organization
How clients read and write HDFS data
HDFS recovery processes
Hadoop archival ...
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