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From "Yonik Seeley (JIRA)" <>
Subject [jira] Resolved: (LUCENE-443) ConjunctionScorer tune-up
Date Tue, 17 Oct 2006 20:52:38 GMT
     [ ]

Yonik Seeley resolved LUCENE-443.

    Fix Version/s: 2.1
       Resolution: Fixed
         Assignee: Yonik Seeley

Thanks!  I just committed this.

> ConjunctionScorer tune-up
> -------------------------
>                 Key: LUCENE-443
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 1.9
>         Environment: Linux, Java 1.5, Large Index with 4 million items and some heavily
nested boolean queries
>            Reporter: Abdul Chaudhry
>         Assigned To: Yonik Seeley
>             Fix For: 2.1
>         Attachments: Conjunction20060921.patch,,
> I just recently ran a load test on the latest code from lucene , which is using a new
BooleanScore and noticed the ConjunctionScorer was crunching through objects , especially
while sorting as part of the skipTo call. It turns a linked list into an array, sorts the
array, then converts the array back to a linked list for further processing by the scoring
engines below.
> 'm not sure if anyone else is experiencing this as I have a very large index (> 4
million items) and I am issuing some heavily nested queries
> Anyway, I decide to change the link list into an array and use a first and last marker
to "simulate" a linked list.
> This scaled much better during my load test as the java gargbage collector was less -
umm - virulent 

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