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From "Hoss Man (JIRA)" <>
Subject [jira] [Commented] (SOLR-2450) Carrot2 clustering should use both its own and Solr's stop words
Date Wed, 30 Mar 2011 20:19:05 GMT


Hoss Man commented on SOLR-2450:

people can name their stopwords file anything they want -- and that's just with the default
StopFilterFactory, it doesn't even account for the possibility of other filter factories that
implement similar functionality.

one thing you could probably do, assuming you wanted to stick with just worrying about the
stock StopFilterFactory, is to query the IndexSchema for the analyzer of the fieldTypes you
are interested in (presumably via some configured list of field names) and then test those
analyzers to see if they are analysis chain based, and if they are look to see if they contain
the StopFilterFactory, and if they do, THEN you can get the list of words (or at the very
least: the file the words came from)

AnalysisRequestHandlerBase should have an example of walking an analysis chain to see what
factories are in it.

> Carrot2 clustering should use both its own and Solr's stop words
> ----------------------------------------------------------------
>                 Key: SOLR-2450
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: contrib - Clustering
>            Reporter: Stanislaw Osinski
>            Assignee: Stanislaw Osinski
>            Priority: Minor
>             Fix For: 3.2, 4.0
> While using only Solr's stop words for clustering isn't a good idea (compared to indexing,
clustering needs more aggressive stop word removal to get reasonable cluster labels), it would
be good if Carrot2 used both its own and Solr's stop words.
> I'm not sure what the best way to implement this would be though. My first thought was
to simply load {{stopwords.txt}} from Solr config dir and merge them with Carrot2's. But then,
maybe a better approach would be to get the stop words from the StopFilter being used? Ideally,
we should also consider the per-field stop filters configured on the fields used for clustering.

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