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https://issues.apache.org/jira/browse/SOLR-4017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Nothman updated SOLR-4017:
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Priority: Minor (was: Major)
> Signatures for deduplication should be Analyzers
> ------------------------------------------------
>
> Key: SOLR-4017
> URL: https://issues.apache.org/jira/browse/SOLR-4017
> Project: Solr
> Issue Type: Improvement
> Components: update
> Affects Versions: 4.0
> Environment: N/A
> Reporter: Joel Nothman
> Priority: Minor
>
> At present, signatures for deduplication are constructed from the raw text of
> a specified set of fields. This means they may not take advantage of the
> normalization provided by Analyzers: stripping of HTML, tokenization,
> diacritic normalization, stemming or stop-removal, etc. It would also allow a
> token-based signature like the TextProfileSignature to consider character or
> token ngrams where appropriate.
> Instead of handling this task with a special SignatureUpdateProcessorFactory,
> it seems one could do (almost) the same with
> CloneFieldUpdateProcessorFactory, and the appropriate *SignatureAnalyzer
> which outputs a single (or indeed, multiple!) Term: a hash. (I am not
> familiar enough to know whether the {{overwriteDupes}} option would require a
> further UpdateProcessor.)
> The current approach may be more efficient for most cases, so could be
> retained for efficiency compatibility.
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