Searching with Lucene Chapter 2

For discussion Information retrieval What is Lucene? Code for indexer using Lucene Pagerank algorithm

Information Retrieval Consider a collection of documents You want to know what words are in each of the documents Given a word you want to know which document it occurs You want to know how many times a word occurs in document. You want to rank documents according to count

What is Lucene? Apache Lucene is a free/open source information retrieval software library, originally created in Java by Doug Cutting. It is supported by the Apache Software Foundation and is released under the Apache Software License It does indexing at lightning speed. Lucene experience lead to the development of Hadoop (by Doug Cutting).

Why do need to study it? But search is more than indexing: link analysis, click analysis, natural language processing, latent dirichlet allocation (LDA),…page rank,… We are interested in data-intensive computing algorithm such as mapreduce and data structure such as Google file systems. Algorithms we discuss in the context of Lucene could all be converted to data-intensive methods for improving performance and scalability.

Pagerank algorithm