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< h1 > Introduction to The Solr Enterprise Search Server< / h1 >
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< div id = "minitoc-area" >
< ul class = "minitoc" >
< li >
< a href = "#Solr+in+a+Nutshell" > Solr in a Nutshell< / a >
< / li >
< 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 >
< 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 >
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< / li >
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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 >
< div class = "section" >
< 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 >
< ul >
< li > Advanced Full-Text Search Capabilities < / li >
< li > Optimized for High Volume Web Traffic < / li >
< li > Standards Based Open Interfaces - XML and HTTP < / li >
< li > Comprehensive HTML Administration Interfaces < / li >
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< li > Server statistics exposed over JMX for monitoring < / 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 >
< li > Extensible Plugin Architecture < / li >
< / ul >
< / div >
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< a name = "N10032" > < / 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" >
< ul >
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< li > A Real Data Schema, with Numeric Types, 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 Faceted Browsing and Filtering < / li >
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< 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 Snapshot Distribution < / li >
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< li > Distributed search with sharded index on multiple hosts < / li >
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< li > XML and CSV/delimited-text update formats < / li >
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< li > Easy ways to pull in data from databases and XML files from local disk and HTTP sources < / li >
< li > Multiple search indices < / li >
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< / ul >
< / div >
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< a name = "N10066" > < / a > < a name = "Detailed+Features" > < / a >
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< h2 class = "boxed" > Detailed Features< / h2 >
< div class = "section" >
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< a name = "N1006C" > < / a > < a name = "Schema" > < / a >
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< 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 >
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< li > Dynamic Fields enables on-the-fly addition of new 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 >
< 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 >
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< li > Many additional text analysis components including word splitting, regex and sounds-like filters< / li >
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< / ul >
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< a name = "N1008D" > < / a > < a name = "Query" > < / a >
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< h3 class = "boxed" > Query< / h3 >
< ul >
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< li > HTTP interface with configurable response formats (XML/XSLT, JSON, Python, Ruby)< / li >
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< li > Sort by any number of fields< / li >
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< li > Advanced DisMax query parser for high relevancy results from user-entered queries< / li >
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< li > Highlighted context snippets< / li >
< li > Faceted Searching based on unique field values and explicit queries< / li >
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< li > Spelling suggestions for user queries< / li >
< li > More Like This suggestions for given document< / 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 >
< li > Function Query - influence the score by a function of a field's numeric value or ordinal< / li >
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< li > Date Math - specify dates relative to "NOW" in queries and updates< / li >
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< li > Performance Optimizations< / li >
< / ul >
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< a name = "N100B7" > < / a > < a name = "Core" > < / a >
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< h3 class = "boxed" > Core< / h3 >
< ul >
< li > Pluggable query handlers and extensible XML data format< / li >
< li > Document uniqueness enforcement based on unique key field< / li >
< li > Batches updates and deletes for high performance< / li >
< li > User configurable commands triggered on index changes< / li >
< li > Searcher concurrency control< / li >
< li > Correct handling of numeric types for both sorting and range queries< / li >
< li > Ability to control where docs with the sort field missing will be placed< / li >
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< li > "Luke" request handler for corpus information< / li >
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< / ul >
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< a name = "N100D8" > < / a > < a name = "Caching" > < / a >
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< h3 class = "boxed" > Caching< / h3 >
< ul >
< li > Configurable Query Result, Filter, and Document cache instances< / li >
< li > Pluggable Cache implementations< / 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, enabing 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 >
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< a name = "N100FD" > < / a > < a name = "Replication" > < / a >
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< h3 class = "boxed" > Replication< / h3 >
< ul >
< li > Efficient distribution of index parts that have changed via rsync transport< / li >
< li > Pull strategy allows for easy addition of searchers< / li >
< li > Configurable distribution interval allows tradeoff between timeliness and cache utilization< / li >
< / ul >
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< a name = "N1010F" > < / a > < a name = "Admin+Interface" > < / a >
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< h3 class = "boxed" > Admin Interface< / h3 >
< ul >
< li > Comprehensive statistics on cache utilization, updates, and queries< / 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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