Before describing HDFS, just 2 cents on what is a File System? If you studied a theoretical Operating System Course, you already know or have a sense what does file system mean.
To the Hadoop Job client, you mention the path for the input files and the output files (in the HDFS file system). You write your Map Reduce functions in Java and supply them as Jars. You can use C# or other languages for Hadoop functionality, however that is not the focus here.

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