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From "Stefan Groschupf (JIRA)" <j...@apache.org>
Subject [jira] Updated: (NUTCH-336) Harvested links shouldn't get db.score.injected in addition to inbound contributions
Date Fri, 18 Aug 2006 06:37:14 GMT
     [ http://issues.apache.org/jira/browse/NUTCH-336?page=all ]

Stefan Groschupf updated NUTCH-336:
-----------------------------------

    Priority: Critical  (was: Minor)

I think that is a fundamental problem since I observe there are many pages e.g. presentation
slides that have exactly one link to the next page. In very long presentation the last page
has a very high score. We should commit this patch soon. Wrong scoring is a serious issue
in the moment. 

> Harvested links shouldn't get db.score.injected in addition to inbound contributions
> ------------------------------------------------------------------------------------
>
>                 Key: NUTCH-336
>                 URL: http://issues.apache.org/jira/browse/NUTCH-336
>             Project: Nutch
>          Issue Type: Bug
>          Components: fetcher
>    Affects Versions: 0.8
>            Reporter: Chris Schneider
>            Priority: Critical
>         Attachments: NUTCH-336.patch.txt
>
>
> Currently (even with Stefan's fix for NUTCH-324), harvested links have their initial
scores set to db.score.injected + (sum of inbound contributions * db.score.link.[internal
| external]), but this will place (at least external) harvested links even higher than injected
URLs on the fetch list. Perhaps more importantly, this effect cascades.
> As a simple example, if each page in A->B->C->D has exactly one external link
and only A is injected, then D will receive an initial score of at least (4*db.score.injected)
with the default db.score.link.external of 1.0. Higher values of db.score.injected and db.score.link.external
obviously exacerbate this problem.

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