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From "Chris Schneider (JIRA)" <j...@apache.org>
Subject [jira] Updated: (NUTCH-336) Harvested links shouldn't get db.score.injected in addition to inbound contributions
Date Wed, 02 Aug 2006 18:34:18 GMT
     [ http://issues.apache.org/jira/browse/NUTCH-336?page=all ]

Chris Schneider updated NUTCH-336:
----------------------------------

    Attachment: NUTCH-336.patch.txt

Here's a patch that fixes the problem. It separates a new injectionScore API out from the
initialScore API.

> 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: Minor
>         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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