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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (LUCENE-2098) make BaseCharFilter more efficient in performance
Date Sat, 30 Oct 2010 10:36:19 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir reopened LUCENE-2098:
---------------------------------


reopening for potential backport.

I think this one (n^2) is really buggish territory, the original user reports > 2x slowdown
with solr 1.4

I think the fix is safe, its baked in trunk/3.x a while, and if we have perf bugs like this
with no api breaks, 
it makes sense... but if someone objects I won't backport.


> make BaseCharFilter more efficient in performance
> -------------------------------------------------
>
>                 Key: LUCENE-2098
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2098
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/analyzers
>    Affects Versions: 3.1
>            Reporter: Koji Sekiguchi
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 2.9.4, 3.0.3, 3.1, 4.0
>
>         Attachments: LUCENE-2098.patch, LUCENE-2098.patch, LUCENE-2098.patch
>
>
> Performance degradation in Solr 1.4 was reported. See:
> http://www.lucidimagination.com/search/document/43c4bdaf5c9ec98d/html_stripping_slower_in_solr_1_4
> The inefficiency has been pointed out in BaseCharFilter javadoc by Mike:
> {panel}
> NOTE: This class is not particularly efficient. For example, a new class instance is
created for every call to addOffCorrectMap(int, int), which is then appended to a private
list. 
> {panel}

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