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https://issues.apache.org/jira/browse/LUCENE-4688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-4688:
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Fix Version/s: (was: 4.7)
4.8
> Reuse TermsEnum in BlockTreeTermsReader
> ---------------------------------------
>
> Key: LUCENE-4688
> URL: https://issues.apache.org/jira/browse/LUCENE-4688
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Affects Versions: 4.0, 4.1
> Reporter: Simon Willnauer
> Fix For: 4.8
>
> Attachments: LUCENE-4688.patch
>
>
> Opening a TermsEnum comes with a significant cost at this point if done
> frequently like primary key lookups or if many segments are present.
> Currently we don't reuse it at all and create a lot of objects even if the
> enum is just used for a single seekExact (ie. TermQuery). Stressing the
> Terms#iterator(reuse) call shows significant gains with reuse...
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