mirror of https://github.com/apache/lucene.git
357 lines
11 KiB
HTML
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357 lines
11 KiB
HTML
Executable File
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<title>Introduction to The Solr Enterprise Search Server</title>
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<a href="http://www.apache.org/">apache</a> > <a href="http://lucene.apache.org/">lucene</a><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script>
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<input value="lucene.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google">
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<a class="dida" href="features.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
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PDF</a>
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</div>
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<h1>Introduction to The Solr Enterprise Search Server</h1>
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<div id="minitoc-area">
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<ul class="minitoc">
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<li>
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<a href="#Solr+in+a+Nutshell">Solr in a Nutshell</a>
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</li>
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<li>
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<a href="#Solr+Uses+the+Lucene+Search+Library+and+Extends+it%21">Solr Uses the Lucene Search Library and Extends it!</a>
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</li>
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<li>
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<a href="#Detailed+Features">Detailed Features</a>
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<ul class="minitoc">
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<li>
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<a href="#Schema">Schema</a>
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</li>
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<li>
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<a href="#Query">Query</a>
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</li>
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<li>
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<a href="#Core">Core</a>
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</li>
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<li>
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<a href="#Caching">Caching</a>
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</li>
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<li>
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<a href="#Replication">Replication</a>
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</li>
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<li>
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<a href="#Admin+Interface">Admin Interface</a>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<a name="N1000D"></a><a name="Solr+in+a+Nutshell"></a>
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<h2 class="boxed">Solr in a Nutshell</h2>
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<div class="section">
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<p>
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Solr is a standalone enterprise search server with a web-services like API. You put documents in it (called "indexing") via XML over HTTP. You query it via HTTP GET and receive XML results.
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</p>
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<ul>
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<li> Advanced Full-Text Search Capabilities </li>
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<li> Optimized for High Volume Web Traffic </li>
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<li> Standards Based Open Interfaces - XML and HTTP </li>
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<li> Comprehensive HTML Administration Interfaces </li>
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<li> Scalability - Efficient Replication to other Solr Search Servers </li>
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<li> Flexible and Adaptable with XML configuration </li>
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<li> Extensible Plugin Architecture </li>
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</ul>
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</div>
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<a name="N1002F"></a><a name="Solr+Uses+the+Lucene+Search+Library+and+Extends+it%21"></a>
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<h2 class="boxed">Solr Uses the Lucene Search Library and Extends it!</h2>
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<div class="section">
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<ul>
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<li> A Real Data Schema, with Dynamic Fields, Unique Keys </li>
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<li> Powerful Extensions to the Lucene Query Language </li>
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<li> Support for Dynamic Result Grouping and Filtering </li>
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<li> Advanced, Configurable Text Analysis </li>
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<li> Highly Configurable and User Extensible Caching </li>
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<li> Performance Optimizations </li>
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<li> External Configuration via XML </li>
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<li> An Administration Interface </li>
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<li> Monitorable Logging </li>
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<li> Fast Incremental Updates and Snapshot Distribution </li>
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</ul>
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</div>
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<a name="N10057"></a><a name="Detailed+Features"></a>
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<h2 class="boxed">Detailed Features</h2>
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<div class="section">
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<a name="N1005D"></a><a name="Schema"></a>
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<h3 class="boxed">Schema</h3>
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<ul>
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<li>Defines the field types and fields of documents</li>
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<li>Can drive more intelligent processing</li>
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<li>Declarative Lucene Analyzer specification</li>
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<li>Dynamic Fields enables on-the-fly addition of fields</li>
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<li>CopyField functionality allows indexing a single field multiple ways, or combining multiple fields into a single searchable field</li>
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<li>Explicit types eliminates the need for guessing types of fields</li>
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<li>External file-based configuration of stopword lists, synonym lists, and protected word lists</li>
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</ul>
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<a name="N1007B"></a><a name="Query"></a>
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<h3 class="boxed">Query</h3>
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<ul>
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<li>HTTP interface with configurable response formats (XML/XSLT, JSON, Python, Ruby)</li>
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<li>Highlighted context snippets</li>
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<li>Faceted Searching based on field values and explicit queries</li>
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<li>Sort specifications added to query language</li>
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<li>Constant scoring range and prefix queries - no idf, coord, or lengthNorm factors, and no restriction on the number of terms the query matches.</li>
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<li>Function Query - influence the score by a function of a field's numeric value or ordinal</li>
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<li>Performance Optimizations</li>
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</ul>
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<a name="N10099"></a><a name="Core"></a>
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<h3 class="boxed">Core</h3>
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<ul>
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<li>Pluggable query handlers and extensible XML data format</li>
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<li>Document uniqueness enforcement based on unique key field</li>
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<li>Batches updates and deletes for high performance</li>
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<li>User configurable commands triggered on index changes</li>
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<li>Searcher concurrency control</li>
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<li>Correct handling of numeric types for both sorting and range queries</li>
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<li>Ability to control where docs with the sort field missing will be placed</li>
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<li>Support for dynamic grouping of search results</li>
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</ul>
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<a name="N100BA"></a><a name="Caching"></a>
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<h3 class="boxed">Caching</h3>
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<ul>
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<li>Configurable Query Result, Filter, and Document cache instances</li>
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<li>Pluggable Cache implementations</li>
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<li>Cache warming in background
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<ul>
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<li> When a new searcher is opened, configurable searches are run against
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it in order to warm it up to avoid
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slow first hits. During warming, the current searcher handles live requests.
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</li>
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</ul>
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</li>
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<li>Autowarming in background
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<ul>
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<li>The most recently accessed items in the caches of the current
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searcher are re-populated in the new searcher, enabing high cache hit
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rates across index/searcher changes.</li>
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</ul>
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</li>
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<li>Fast/small filter implementation</li>
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<li>User level caching with autowarming support</li>
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</ul>
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<a name="N100DF"></a><a name="Replication"></a>
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<h3 class="boxed">Replication</h3>
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<ul>
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<li>Efficient distribution of index parts that have changed via rsync transport</li>
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<li>Pull strategy allows for easy addition of searchers</li>
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<li>Configurable distribution interval allows tradeoff between timeliness and cache utilization</li>
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</ul>
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<a name="N100F1"></a><a name="Admin+Interface"></a>
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<h3 class="boxed">Admin Interface</h3>
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<ul>
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<li>Comprehensive statistics on cache utilization, updates, and queries</li>
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<li>Text analysis debugger, showing result of every stage in an analyzer</li>
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<li>Web Query Interface w/ debugging output
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<ul>
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<li>parsed query output</li>
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<li>Lucene explain() document score detailing</li>
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<li>explain score for documents outside of the requested range to debug why a given document wasn't ranked higher.</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<div class="clearboth"> </div>
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</div>
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<div id="footer">
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<div class="lastmodified">
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<script type="text/javascript"><!--
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document.write("<text>Last Published:</text> " + document.lastModified);
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// --></script>
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</div>
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<div class="copyright">
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Copyright ©
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2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
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