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Markus Jelsma commented on NUTCH-936:
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Committed for 1.3 in 1037732
Can't commit right now for trunk because i still cannot compile the check out.
> LanguageIdentifier should not set empty lang field on NutchDocument
> -------------------------------------------------------------------
>
> Key: NUTCH-936
> URL: https://issues.apache.org/jira/browse/NUTCH-936
> Project: Nutch
> Issue Type: Bug
> Components: indexer
> Affects Versions: 1.2
> Reporter: Markus Jelsma
> Assignee: Markus Jelsma
> Priority: Minor
> Fix For: 1.3, 2.0
>
> Attachments: NUTCH-936-v12-1.patch, NUTCH-936-v13-1.patch, NUTCH-936-v13-1.patch
>
>
> For some reason the language identifier plugin sometimes sets an empty value for the
lang field. It is confirmed to occur in 1.2 when parsing a scanned PDF file which cannot be
OCR'd to proper text, resulting in an empty content field. Anyway, whether it's a problem
with the parser or not, the plugin itself should not add an empty value because the content
field can always be empty. The plugin already checks for a null value and then sets the lang
field to `unknown`, which is fine. But when the lang string is empty, it should also be set
to `unknown`.
> This might break clients that have conditional logic on the empty value, but not on the
`unknown` value because it may never have occurred in their set up and therefore they might
not have added `unknown` to their logic. However, it might seem a little bit overkill to put
this proposal behind a configuration option and let Nutch by default continue to behave as
it currently does. Any thoughts on this one?
> Here's the troublesome URL : http://www.nrc.nl/redactie/binnenland/memo_buza_irak.pdf
that returns an empty content field and an empty lang string in 1.2 and presumably in trunk
and other versions as well.
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