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https://issues.apache.org/jira/browse/LUCENE-7365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-7365:
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Attachment: LUCENE-7365.patch
Patch. This prevents use of BooleanScorer if the segment is smaller than 1024
docs. I'm not sure if that's the best cutoff though, and I'd like to do some
benchmarking to check performance.
> 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.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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