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From "Mark Harwood (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-494) Analyzer for preventing overload of search service by queries with common terms in large indexes
Date Tue, 07 Feb 2006 23:13:16 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-494?page=all ]

Mark Harwood updated LUCENE-494:
--------------------------------

    Attachment: QueryAutoStopWordAnalyzer.java

> Analyzer for preventing overload of search service by queries with common terms in large
indexes
> ------------------------------------------------------------------------------------------------
>
>          Key: LUCENE-494
>          URL: http://issues.apache.org/jira/browse/LUCENE-494
>      Project: Lucene - Java
>         Type: New Feature
>   Components: Analysis
>     Reporter: Mark Harwood
>     Priority: Minor
>  Attachments: QueryAutoStopWordAnalyzer.java
>
> An analyzer used primarily at query time to wrap another analyzer and provide a layer
of protection
> which prevents very common words from being passed into queries. For very large indexes
the cost
> of reading TermDocs for a very common word can be  high. This analyzer was created after
experience with
> a 38 million doc index which had a term in around 50% of docs and was causing TermQueries
for 
> this term to take 2 seconds.
> Use the various "addStopWords" methods in this class to automate the identification and
addition of 
> stop words found in an already existing index.

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