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https://issues.apache.org/jira/browse/NUTCH-1090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090257#comment-13090257
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Markus Jelsma commented on NUTCH-1090:
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You can patch o.a.n.crawl.LinkDB.configure() to log this information.
> LinkDb (invertlinks) should inform the user when it ignores internal links
> --------------------------------------------------------------------------
>
> Key: NUTCH-1090
> URL: https://issues.apache.org/jira/browse/NUTCH-1090
> Project: Nutch
> Issue Type: Improvement
> Components: linkdb
> Affects Versions: 1.3
> Reporter: Marek Bachmann
> Priority: Trivial
> Labels: configuration, information, log
> Fix For: 1.3
>
> Attachments: LinkDb.patch
>
>
> I used nutch to crawl sites on a single domain. After the crawl was complete
> I tried to build a LinkDb. The LinkDb was empty.
> It comes up that this happens because the invertlinks command ignores
> internal links to the same domain by default.
> Unfortunately the LinkDb class doesn't tell anything about that. So it was
> hard to find out why the LinkDb was empty.
> I suggest to add an information for the user when the invertlinks command is
> ignoring internal links.
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