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https://issues.apache.org/jira/browse/LUCENE-4044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421408#comment-13421408
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Yonik Seeley commented on LUCENE-4044:
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bq. Why?
Aside from other back compat risks, there are performance concerns.
http://colabti.org/irclogger/irclogger_log/lucene-dev?date=2012-07-24
> Add NamedSPILoader support to TokenizerFactory, TokenFilterFactory and
> CharFilterFactory
> ----------------------------------------------------------------------------------------
>
> Key: LUCENE-4044
> URL: https://issues.apache.org/jira/browse/LUCENE-4044
> Project: Lucene - Core
> Issue Type: Sub-task
> Components: modules/analysis
> Reporter: Chris Male
> Fix For: 4.0
>
> Attachments: LUCENE-4044.patch
>
>
> In LUCENE-2510 I want to move all the analysis factories out of Solr and into
> the directories with what they create. This is going to hamper Solr's
> existing strategy for supporting {{solr.*}} package names, where it replaces
> {{solr}} with various pre-defined package names. One way to tackle this is
> to use NamedSPILoader so we simply look up {{StandardTokenizerFactory}} for
> example, and find it wherever it is, as long as it is defined as a service.
> This is similar to how we support Codecs currently.
> As noted by Robert in LUCENE-2510, this would also have the benefit of
> meaning configurations could be less verbose, would aid in fully decoupling
> the analysis module from Solr, and make the analysis factories easier to
> interact with.
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