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Posted to dev@lucene.apache.org by "Simon Willnauer (JIRA)" <ji...@apache.org> on 2013/01/16 16:32:12 UTC

[jira] [Created] (LUCENE-4688) Reuse TermsEnum in BlockTreeTermsReader

Simon Willnauer created LUCENE-4688:
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             Summary: 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: 4.2, 5.0


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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