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From Apache Wiki <>
Subject [Solr Wiki] Update of "SolrTerminology" by HossMan
Date Tue, 30 Jun 2009 17:58:48 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The following page has been changed by HossMan:

   * '''''Searcher''''': In Solr parlance, the term "Searcher" tends to refer to an instance
of the !SolrIndexSearcher class.  This class is responsible for executing all searches done
against the index, and manages several caches.  There is typically  one Searcher per !SolrCore
at any given time, and that searcher is used to execute all queries against that !SolrCore,
but there may be additional Searchers open at a time during cache warming (in which and "old
Searcher" is still serving live requests while a "new Searcher" is being warmed up).
   * '''''Shard''''': A distributed index is partitioned into "shards". Each shard corresponds
to a Lucene instance and contains a disjoint subset of the documents in the index.
   * '''''Slop''''': As in "phrase slop": the number of positions two tokens need to be moved
in order to match a phrase in a query.
+  * '''''Solr Core''''': Also referred to as just a "'''''Core'''''" This is a running instance
of a Solr index along with all of it's configuration (SolrConfigXml, SchemaXml, etc...). 
A single Solr application can contain 0 or more cores which are run largely in isolation but
can communicate with each other if necessary via the !CoreContainer.  From a historical perspective:
Solr initially only supported one index, and the !SolrCore class was a singleton for coordinating
the low level functionality at the "core" of Solr.  When support was added for [:CoreAdmin:creating
and managing multiple Cores] on the fly, the class was refactored to no longer be a Singleton,
but the name stuck.
   * '''''Solr Home Dir''''': Also referred to as the "'''''Solr Home Directory'''''" or just
"'''''Solr Home'''''" this is the main directory where Solr will look for configuration files,
data, and plugins.  Knowing which directory to use as the Solr Home is the one piece of information
that Solr must either assume (the default is "./solr") or be configured using some mechanism
beyond Solr's normal configuration files.  An [
example Solr Home] is included in Solr releases and contains a [
README.txt] explaining the directory structure.  For more information on ways to override
the default Solr Home, please read SolrInstall.
   * '''''Static warming''''': What users can do using newSearcher and firstSearcher event
listeners to force explicit warming actions to be taken when one of these events happens --
frequently it involves seeding one or more caches with values from "static" queries hard coded
in the solrconfig.xml

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