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List:       lucene-dev
Subject:    [jira] [Commented] (LUCENE-7365) Don't use BooleanScorer for small segments
From:       "Adrien Grand (JIRA)" <jira () apache ! org>
Date:       2016-06-30 16:54:10
Message-ID: JIRA.12985131.1467225096000.5795.1467305650182 () Atlassian ! JIRA
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    [ https://issues.apache.org/jira/browse/LUCENE-7365?page=com.atlassian.jira.plugin \
.system.issuetabpanels:comment-tabpanel&focusedCommentId=15357459#comment-15357459 ] 

Adrien Grand commented on LUCENE-7365:
--------------------------------------

Yes, exactly.

> Don't use BooleanScorer for small segments
> ------------------------------------------
> 
> Key: LUCENE-7365
> URL: https://issues.apache.org/jira/browse/LUCENE-7365
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Attachments: LUCENE-7365-query.patch, LUCENE-7365.patch, LUCENE-7365.patch
> 
> 
> If a BooleanQuery meets certain criteria (only contains disjunctions, is likely to \
> match large numbers of docs) then we use a BooleanScorer to score groups of 1024 \
> docs at a time.  This allocates arrays of 1024 Bucket objects up-front.  On very \
> small segments (for example, a MemoryIndex) this is very wasteful of memory, \
> particularly if the query is large or deeply-nested.  We should avoid using a bulk \
> scorer on these segments.



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