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| <h1>Introduction to The Solr Enterprise Search Server</h1> |
| <div id="minitoc-area"> |
| <ul class="minitoc"> |
| <li> |
| <a href="#Solr+in+a+Nutshell">Solr in a Nutshell</a> |
| </li> |
| <li> |
| <a href="#Solr+Uses+the+Lucene+Search+Library+and+Extends+it%21">Solr Uses the Lucene Search Library and Extends it!</a> |
| </li> |
| <li> |
| <a href="#Detailed+Features">Detailed Features</a> |
| <ul class="minitoc"> |
| <li> |
| <a href="#Schema">Schema</a> |
| </li> |
| <li> |
| <a href="#Query">Query</a> |
| </li> |
| <li> |
| <a href="#Core">Core</a> |
| </li> |
| <li> |
| <a href="#Caching">Caching</a> |
| </li> |
| <li> |
| <a href="#Replication">Replication</a> |
| </li> |
| <li> |
| <a href="#Admin+Interface">Admin Interface</a> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| |
| |
| <a name="N1000E"></a><a name="Solr+in+a+Nutshell"></a> |
| <h2 class="boxed">Solr in a Nutshell</h2> |
| <div class="section"> |
| <p> |
| Solr is a standalone enterprise search server with a REST-like API. You put documents in it (called "indexing") via XML, JSON or binary over HTTP. You query it via HTTP GET and receive XML, JSON, or binary results. |
| </p> |
| <ul> |
| |
| <li> Advanced Full-Text Search Capabilities </li> |
| |
| <li> Optimized for High Volume Web Traffic </li> |
| |
| <li> Standards Based Open Interfaces - XML,JSON and HTTP </li> |
| |
| <li> Comprehensive HTML Administration Interfaces </li> |
| |
| <li> Server statistics exposed over JMX for monitoring </li> |
| |
| <li> Scalability - Efficient Replication to other Solr Search Servers </li> |
| |
| <li> Flexible and Adaptable with XML configuration </li> |
| |
| <li> Extensible Plugin Architecture </li> |
| |
| </ul> |
| </div> |
| |
| |
| <a name="N10033"></a><a name="Solr+Uses+the+Lucene+Search+Library+and+Extends+it%21"></a> |
| <h2 class="boxed">Solr Uses the Lucene Search Library and Extends it!</h2> |
| <div class="section"> |
| <ul> |
| |
| <li> A Real Data Schema, with Numeric Types, Dynamic Fields, Unique Keys </li> |
| |
| <li> Powerful Extensions to the Lucene Query Language </li> |
| |
| <li> Faceted Search and Filtering </li> |
| |
| <li> Geospatial Search </li> |
| |
| <li> Advanced, Configurable Text Analysis </li> |
| |
| <li> Highly Configurable and User Extensible Caching </li> |
| |
| <li> Performance Optimizations </li> |
| |
| <li> External Configuration via XML </li> |
| |
| <li> An Administration Interface </li> |
| |
| <li> Monitorable Logging </li> |
| |
| <li> Fast Incremental Updates and Index Replication </li> |
| |
| <li> Highly Scalable Distributed search with sharded index across multiple hosts </li> |
| |
| <li> JSON, XML, CSV/delimited-text, and binary update formats </li> |
| |
| <li> Easy ways to pull in data from databases and XML files from local disk and HTTP sources </li> |
| |
| <li> Rich Document Parsing and Indexing (PDF, Word, HTML, etc) using Apache Tika </li> |
| |
| <li> Apache UIMA integration for configurable metadata extraction </li> |
| |
| <li> Multiple search indices </li> |
| |
| </ul> |
| </div> |
| |
| |
| <a name="N10070"></a><a name="Detailed+Features"></a> |
| <h2 class="boxed">Detailed Features</h2> |
| <div class="section"> |
| <a name="N10076"></a><a name="Schema"></a> |
| <h3 class="boxed">Schema</h3> |
| <ul> |
| |
| <li>Defines the field types and fields of documents</li> |
| |
| <li>Can drive more intelligent processing</li> |
| |
| <li>Declarative Lucene Analyzer specification</li> |
| |
| <li>Dynamic Fields enables on-the-fly addition of new fields</li> |
| |
| <li>CopyField functionality allows indexing a single field multiple ways, or combining multiple fields into a single searchable field</li> |
| |
| <li>Explicit types eliminates the need for guessing types of fields</li> |
| |
| <li>External file-based configuration of stopword lists, synonym lists, and protected word lists</li> |
| |
| <li>Many additional text analysis components including word splitting, regex and sounds-like filters</li> |
| |
| </ul> |
| <a name="N10097"></a><a name="Query"></a> |
| <h3 class="boxed">Query</h3> |
| <ul> |
| |
| <li>HTTP interface with configurable response formats (XML/XSLT, JSON, Python, Ruby, PHP, Velocity, binary)</li> |
| |
| <li>Sort by any number of fields, and by complex functions of numeric fields</li> |
| |
| <li>Advanced DisMax query parser for high relevancy results from user-entered queries</li> |
| |
| <li>Highlighted context snippets</li> |
| |
| <li>Faceted Searching based on unique field values, explicit queries, date ranges, and numeric ranges</li> |
| |
| <li>Multi-Select Faceting by tagging and selectively excluding filters</li> |
| |
| <li>Spelling suggestions for user queries</li> |
| |
| <li>More Like This suggestions for given document</li> |
| |
| <li>Function Query - influence the score by user specified complex functions of |
| numeric fields or query relevancy scores.</li> |
| |
| <li>Range filter over Function Query results</li> |
| |
| <li>Date Math - specify dates relative to "NOW" in queries and updates</li> |
| |
| <li>Dynamic search results clustering using Carrot2</li> |
| |
| <li>Numeric field statistics such as min, max, average, standard deviation </li> |
| |
| <li>Combine queries derived from different syntaxes</li> |
| |
| <li>Auto-suggest functionality for completing user queries</li> |
| |
| <li>Allow configuration of top results for a query, overriding normal scoring and sorting</li> |
| |
| <li>Performance Optimizations</li> |
| |
| </ul> |
| <a name="N100D3"></a><a name="Core"></a> |
| <h3 class="boxed">Core</h3> |
| <ul> |
| |
| <li>Dynamically create and delete document collections without restarting</li> |
| |
| <li>Pluggable query handlers and extensible XML data format</li> |
| |
| <li>Pluggable user functions for Function Query</li> |
| |
| <li>Customizable component based request handler with distributed search support</li> |
| |
| <li>Document uniqueness enforcement based on unique key field</li> |
| |
| <li>Duplicate document detection, including fuzzy near duplicates</li> |
| |
| <li>Custom index processing chains, allowing document manipulation before indexing</li> |
| |
| <li>User configurable commands triggered on index changes</li> |
| |
| <li>Ability to control where docs with the sort field missing will be placed</li> |
| |
| <li>"Luke" request handler for corpus information</li> |
| |
| </ul> |
| <a name="N100FA"></a><a name="Caching"></a> |
| <h3 class="boxed">Caching</h3> |
| <ul> |
| |
| <li>Configurable Query Result, Filter, and Document cache instances</li> |
| |
| <li>Pluggable Cache implementations, including a lock free, high concurrency implementation</li> |
| |
| <li>Cache warming in background |
| <ul> |
| <li> When a new searcher is opened, configurable searches are run against |
| it in order to warm it up to avoid |
| slow first hits. During warming, the current searcher handles live requests. |
| </li> |
| </ul> |
| |
| </li> |
| |
| <li>Autowarming in background |
| <ul> |
| |
| <li>The most recently accessed items in the caches of the current |
| searcher are re-populated in the new searcher, enabling high cache hit |
| rates across index/searcher changes.</li> |
| |
| </ul> |
| |
| </li> |
| |
| <li>Fast/small filter implementation</li> |
| |
| <li>User level caching with autowarming support</li> |
| |
| </ul> |
| <a name="N1011F"></a><a name="Replication"></a> |
| <h3 class="boxed">Replication</h3> |
| <ul> |
| |
| <li>Efficient distribution of index parts that have changed</li> |
| |
| <li>Pull strategy allows for easy addition of searchers</li> |
| |
| <li>Configurable distribution interval allows tradeoff between timeliness and cache utilization</li> |
| |
| <li>Replication and automatic reloading of configuration files</li> |
| |
| </ul> |
| <a name="N10134"></a><a name="Admin+Interface"></a> |
| <h3 class="boxed">Admin Interface</h3> |
| <ul> |
| |
| <li>Comprehensive statistics on cache utilization, updates, and queries</li> |
| |
| <li>Interactive schema browser that includes index statistics</li> |
| |
| <li>Replication monitoring</li> |
| |
| <li>Full logging control</li> |
| |
| <li>Text analysis debugger, showing result of every stage in an analyzer</li> |
| |
| <li>Web Query Interface w/ debugging output |
| <ul> |
| |
| <li>parsed query output</li> |
| |
| <li>Lucene explain() document score detailing</li> |
| |
| <li>explain score for documents outside of the requested range to debug why a given document wasn't ranked higher.</li> |
| |
| </ul> |
| |
| </li> |
| |
| </ul> |
| </div> |
| |
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