[ http://issues.apache.org/jira/browse/NUTCH-416?page=all ]
Andrzej Bialecki closed NUTCH-416.
-----------------------------------
Resolution: Fixed
Fixed in trunk, rev. 490607. As a side effect it is now possible to correctly
update CrawlDB from multiple segments, even if they contain duplicate pages -
the code in CrawlDbReducer will correctly apply only the latest version of
CrawlDatum.
> CrawlDatum status and CrawlDbReducer refactoring
> ------------------------------------------------
>
> Key: NUTCH-416
> URL: http://issues.apache.org/jira/browse/NUTCH-416
> Project: Nutch
> Issue Type: Improvement
> Affects Versions: 0.9.0
> Reporter: Andrzej Bialecki
> Assigned To: Andrzej Bialecki
> Fix For: 0.9.0
>
>
> CrawlDatum needs more status codes, e.g. to reflect redirected pages.
> However, current values of status codes are linear, which prevents us from
> adding new codes in proper places. This is also related to the logic in
> CrawlDbReducer, which makes decisions based on arithmetic ordering of status
> code values.
> I propose to change the codes so that they are grouped into related values,
> with significant gaps between groups for adding new codes without causing
> significant reordering. I also propose to change the logic in CrawlDbReducer
> so that its operation is not so dependent on actual code values.
> A mapping should also be added between old and new codes to facilitate
> backward-compatibility of existing data. This mapping should be applied on
> the fly, without requiring explicit data conversion.
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