MapReduce Assignment

Map/Reduce simplified system which tokenize input *.txt file. Output creates a text file, which contain each token and its count.

Details

The Map/Reduce system has been built using the following two classes:

1. Map class This class contains:

• a private ArrayList
• a public method map(), which tokenize workshop.txt into its words, each of which is inserted into the Arraylist (duplicates are allowed).
• a public method getList() to return the ArrayList (getter)

2. Reduce class This class contains:

• a private Hashtable<String, Integer>
• a public method reduce(ArrayList), which (a) load all the tokens of the ArrayList, passed as argument, into the Hashtable, (b) count the number of times (count) each token appears in the ArrayList, and store each count in the Hashtable <key: token, value:count>, (c) creates a text file, which contain each token and its count, e.g., author: 15. Each line of the text file contain one such tuple.

The Reduce class host the main part, which drive the workflow of the application.