O'Reilly logo

Hadoop MapReduce v2 Cookbook - Second Edition by Thilina Gunarathne

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Generating an inverted index using Hadoop MapReduce

Simple text searching systems rely on inverted index to look up the set of documents that contain a given word or a term. In this recipe, we implement a simple inverted index building application that computes a list of terms in the documents, the set of documents that contains each term, and the term frequency in each of the documents. Retrieval of results from an inverted index can be as simple as returning the set of documents that contains the given terms or can involve much more complex operations such as returning the set of documents ordered based on a particular ranking.

Getting ready

You must have Apache Hadoop v2 configured and installed to follow this recipe. Gradle is needed for the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required