[ http://issues.apache.org/jira/browse/NUTCH-321?page=all ]
Andrzej Bialecki closed NUTCH-321.
-----------------------------------
Resolution: Fixed
Patch applied to trunk/ .
NOTE: this requires a (trivial) change in any custom scoring plugin. Most
likely, to accomodate for the future support for interleaved fetching cycles,
you should use the "old" CrawlDatum as a basis for the initial score to be
updated, instead of the "datum" (which is a snapshot of the value at the time
of generating the fetchlist).
> Scoring API deficiency
> ----------------------
>
> Key: NUTCH-321
> URL: http://issues.apache.org/jira/browse/NUTCH-321
> Project: Nutch
> Issue Type: Improvement
> Affects Versions: 0.8-dev
> Reporter: Andrzej Bialecki
> Fix For: 0.8-dev
>
> Attachments: patch.txt
>
>
> Currently the method ScoringFilter.updateDbScore() doesn't use the "old"
> value from existing CrawlDB. Instead it uses the value taken from the
> fetchlist from the current segment, which represents a snapshot of the "old"
> value taken at the moment of generating the fetchlist.
> The problem with this approach is that if/when we add a possibility to
> interleave generate/fetch/update cycles, the initial score values in
> CrawlDatum instance that comes from the current segment could be already
> outdated, if another updatedb was run in the meantime, which changed the DB
> score.
> For this reason we should always assume that the value from CrawlDB, if
> exists, represents the most recent version of CrawlDatum before the update,
> and use this instance as a base.
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