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From Apache Wiki <>
Subject [Solr Wiki] Update of "SolrTerminology" by HossMan
Date Sat, 30 Jul 2011 00:15:01 GMT
Dear Wiki user,

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

The "SolrTerminology" page has been changed by HossMan:


     1. The "fq" param which constrains the results from a query without influencing the scores.
     1. Specifically referring to the Lucene "Filter" class
   * '''''Request Handler''''': A Solr component that processes requests. For example, the
DisMaxRequestHandler processes search queries by calling the DisMax Query Parser. Request
Handlers can perform other functions, as well.
+  * '''''QTime''''': The elapsed time (in milliseconds) between the arrival of the request
(when the SolrQueryRequest object is created) and the completion of the request handler. 
It does not include time spent in the response writer formatting/streaming the response to
the client.
   * '''''Query Parser''''': A Solr component that parses the parameters and search terms
submitted in a search query.
   * '''''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.

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