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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] Commented: (NUTCH-923) Multilingual support for Solr-index-mapping
Date Fri, 22 Oct 2010 16:18:15 GMT


Andrzej Bialecki  commented on NUTCH-923:

This sounds useful, though the implementation needs to keep the following in mind:
* you _assume_ that the lang field will have a nice predictable value, but unless you sanitize
the values you can't assume anything... example: one page I saw had a language metadata set
to a random string 8kB long with various control chars and '\0'-s.

* again, if you don't sanitize and control the total number of unique values in the source
field, you could end up with a number of fields approaching infinity, and Solr would melt

> Multilingual support for Solr-index-mapping
> -------------------------------------------
>                 Key: NUTCH-923
>                 URL:
>             Project: Nutch
>          Issue Type: Improvement
>          Components: indexer
>    Affects Versions: 1.2
>            Reporter: Matthias Agethle
>            Assignee: Markus Jelsma
>            Priority: Minor
> It would be useful to extend the mapping-possibilites when indexing to solr.
> One useful feature would be to use the detected language of the html page (for example
via the language-identifier plugin) and send the content to corresponding language-aware solr-fields.
> The mapping file could be as follows:
> <field dest="lang" source="lang"/>
> <field dest="title_${lang}" source="title" />
> so that the title-field gets mapped to title_en for English-pages and tilte_fr for French
> What do you think? Could this be useful also to others?
> Or are there already other solutions out there?

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