HDFS common interfaces

In this section, we will dig into the HDFS Java interfaces and APIs that can be used to interact with the HDFS File System. We will also to focus on the method implementation of FileSystem classes so that you can understand how to write your own implementation if needed. This will also help you when you test your program against certain test cases. 

HDFS read 

We will talk about two approaches to reading a file and will discuss when to use what. In the first approach, we can use the URL class, which is part of the java.net package and can be used to read files stored on HDFS. The URL calls setURLStreamHandlerFactory(), which requires an instance of FsUrlStreamHandlerFactory(). This initialization...