Solr is a popular and robust open source enterprise search platform from Apache Lucene. Solr is Java-based and runs as a standalone search server within a servlet container such as Tomcat or Jetty. It is built of Lucene Java search library as the core, which is primarily used for full-text indexing and searching. Additionally, Solr core consists of REST-like HTML/XML and JSON APIs, which makes it easy to be virtually compatible with any programming and/or scripting language. Solr is extremely scalable and its external configuration allows you to use it efficiently without any Java coding. Moreover, due to its extensive plugin architecture, you can even customize it as and when required.
Solr's salient features include robust full-text search, faceted search, real-time indexing, clustering, document (Word, PDF, and so on) handling, and geospacial search. Reliability, scalability, and fault tolerance capabilities make Solr even more demanding to the developers, especially to SEO and DevOp professionals.
Chapter 1, Searching data, covers the steps to install Solr, how request and response are handled, ways to query your Solr for most relevant search results, and how to use faceting, geospacial, and distributed search.
Chapter 2, Monitoring Solr, covers how we can monitor Solr, what performance metrics we should be interested in, and how to monitor Solr by using various monitoring tools such as Opsview, New Relic, and Solr Performance Monitoring.
Chapter 3, Managing Solr, covers basic scripts of managing your Solr, scripts to configure both temporary and permanent Solr logs on Tomcat and Jetty, backup your Solr, and collection distribution scripts which include configuration of scripts, SSH, and Rsyncd setup, and how to manage Solr with Drupal 7.
Chapter 4, Optimizing Solr Tools and Scripts, covers business rules and how to write custom rules using Drools, language detection, comparative study of different language detections such as CLD, LangDetect, and Tika, what is NLP, OpenNLP, how does it function and what the different phases OpenNLP consists of and how to implement Solr operation tool using Drupal 7, and the corresponding contributed Drupal modules.
Appendix, Solr Resources, lists down the necessary and essential resources in the form of reference links, books, and video tutorial, which will help you to explore Solr further.
With an intention to run most of the examples in the book, you will need a XAMPP or any other Linux-based web server, Apache Tomcat or Jetty, Java JDK (latest version), Apache Solr 4.x, and Solr PHP client.
A couple of concepts in this book will require additional software and/or tools such as Tomcat Add-on, Opsview, New Relic, and Solr performance monitoring.
Administrating Solr is for developers and Solr administrators who have basic knowledge of Solr and are looking for ways to keep their Solr server healthy and well maintained. Basic working knowledge on Apache Lucene is recommended, but is not mandatory.
In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text, folder names, filenames, file extensions, pathnames, dummy URLs, and user input are shown as follows:
The field definition entry in the solrconfig.xml file tells Solr to look for all the JAR files from the ../../lib directory.
A block of code is set as follows:
<field name="id" type="string" indexed="true" stored="true" required="true" /> <field name="title" type="text" indexed="true" stored="true" /> <field name="author" type="string" indexed="true" stored="true"/>
When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:
<entry>
<name>documentCache</name>
<class>org.apache.solr.search.LRUCache</class>
<version>1.0</version>
<description>LRU Cache(maxSize=512, initialSize=512)</description>
<stats>
<stat name="lookups">3251</stat>
<stat name="hits">3101</stat>
<stat name="hitratio">0.95</stat>
<stat name="inserts">160</stat>
<stat name="evictions">0</stat>
<stat name="size">160</stat>
<stat name="warmupTime">0</stat>
<stat name="cumulative_lookups">3251</stat>
<stat name="cumulative_hits">3101</stat>
<stat name="cumulative_hitratio">0.95</stat>
<stat name="cumulative_inserts">150</stat>
<stat name="cumulative_evictions">0</stat>
</stats>
</entry>
<entry>Any command-line input or output is written as follows:
curl http://localhost:8080/solr/mbartists/admin/stats.jsp
New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "clicking on the Next button moves you to the next screen".
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