Book Image

Scaling Big Data with Hadoop and Solr

By : Hrishikesh Vijay Karambelkar
Book Image

Scaling Big Data with Hadoop and Solr

By: Hrishikesh Vijay Karambelkar

Overview of this book

<p>As data grows exponentially day-by-day, extracting information becomes a tedious activity in itself. Technologies like Hadoop are trying to address some of the concerns, while Solr provides high-speed faceted search. Bringing these two technologies together is helping organizations resolve the problem of information extraction from Big Data by providing excellent distributed faceted search capabilities.</p> <p>Scaling Big Data with Hadoop and Solr is a step-by-step guide that helps you build high performance enterprise search engines while scaling data. Starting with the basics of Apache Hadoop and Solr, this book then dives into advanced topics of optimizing search with some interesting real-world use cases and sample Java code.</p> <p>Scaling Big Data with Hadoop and Solr starts by teaching you the basics of Big Data technologies including Hadoop and its ecosystem and Apache Solr. It explains the different approaches of scaling Big Data with Hadoop and Solr, with discussion regarding the applicability, benefits, and drawbacks of each approach. It then walks readers through how sharding and indexing can be performed on Big Data followed by the performance optimization of Big Data search. Finally, it covers some real-world use cases for Big Data scaling.</p> <p>With this book, you will learn everything you need to know to build a distributed enterprise search platform as well as how to optimize this search to a greater extent resulting in maximum utilization of available resources.</p>
Table of Contents (15 chapters)
Scaling Big Data with Hadoop and Solr
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Using Solr 1301 patch – reduce-side indexing


This patch focuses on using the Apache MapReduce framework for index creation. Keyword search can happen over Apache Solr or Apache SolrCloud. Unlike Solr-1045, in this patch, the indexes are created in the reduce phase of MapReduce. In this patch, a map task is responsible for converting input records to a <key, value> pair; later, they are passed to the reducer, which in turn converts them into SolrInputDocument, and then creates indexes out of it. This index is then passed as outputs of Hadoop MapReduce process. The following diagram depicts this process:

To use Solr-1301 patch, you need to set up a Hadoop cluster. Once the index is created through Hadoop patch, it should then be provisioned to Solr server. The patch contains default converter for CSV files. Let's look at some of the important classes which are part of this patch.

Important class

Description

CSVDocumentConverter

This class is responsible for converting output of the...