In this chapter, we covered Hadoop's origins and how Hadoop evolved over time with more performance-optimized features and tools. We also covered a logical view of the Hadoop platform in detail and understood its different layers. Hadoop distribution was also covered, to help you understand which distribution you should choose. We described the new features available in Hadoop version 3 and will discuss these in more detail in upcoming chapters.
In the next chapter, we will cover HDFS and will walk you through the HDFS architecture and its component in detail. We will go much deeper into the internals of HDFS and HDFS high availability features. We will then look into HDFS read-write operations and how the HDFS caching and federation service works.