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

["Michael McCandless (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-4688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13555126#comment-13555126 ] 

Michael McCandless commented on LUCENE-4688:
--------------------------------------------

Awesome!  I'll look at the patch.

Reuse is important w/ BlockTree's TermsEnum ...
                
> 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
>
>         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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