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

schema.xml


Broadly schema.xml contains following information:

  • Different types of field names of schema and data types (<fields>…<field>)

  • Definition of user/seeded defined data types (<types>…<fieldTypes>)

  • Dynamic fields (<fields>….<dynamicField>)

  • Information about uniqueKey to define each document uniquely (<uniqueKey>)

  • Information regarding QueryParser for Solr (<solrQueryParser>)

  • Default search field is used when the user does not pass the field name (<defaultSearchField>)

  • Information about copying a field from one to another (<copyField>)

In Chapter 2, Understanding Solr, we have already explained important attributes of the schema.xml file. Here is a sample schema.xml file in which the fields will look like the following screenshot:

Remove all the copy fields, if not needed. The uniqueKey field is used to determine each document uniquely and will be required unless it is marked as required=false. The default search field provides a field name that Solr will use for searching when the user does not specify any field. Specify unique key and default search as shown in the following screenshot: