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From "Otis Gospodnetic (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-651) Poor performance race condition in FieldCacheImpl
Date Wed, 20 Dec 2006 03:58:25 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-651?page=comments#action_12459816 ] 
            
Otis Gospodnetic commented on LUCENE-651:
-----------------------------------------

For the record, this patch had a small mistake in it, causing memory leakage.  The fix is
in LUCENE-754.


> Poor performance race condition in FieldCacheImpl
> -------------------------------------------------
>
>                 Key: LUCENE-651
>                 URL: http://issues.apache.org/jira/browse/LUCENE-651
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 2.0.0
>            Reporter: Oliver Hutchison
>         Assigned To: Otis Gospodnetic
>            Priority: Minor
>         Attachments: LUCENE-651.patch
>
>
> A race condition exists in FieldCacheImpl that causes a significant performance degradation
if multiple threads concurrently request a value that is not yet cached. The degradation is
particularly noticable in large indexes and when there a many concurent requests for the cached
value.
> For the full discussion see the mailing list thread 'Poor performance "race condition"
in FieldSortedHitQueue' (http://www.gossamer-threads.com/lists/lucene/java-user/38717).

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