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https://issues.apache.org/jira/browse/NUTCH-530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516357
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Doğacan Güney commented on NUTCH-530:
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Ehm, I am not sure about this... After this, we call updateDbScore twice,
right? Once to 'merge' linked's together, once to pass big-merged-linked to old
datum. This changes ScoringFilter's semantics and may not work for
ScoringFilters if one is, say, using the number of outlinks as a factor in
scoring.
> Add a combiner to improve performance on updatedb
> -------------------------------------------------
>
> Key: NUTCH-530
> URL: https://issues.apache.org/jira/browse/NUTCH-530
> Project: Nutch
> Issue Type: Improvement
> Environment: java 1.6
> Reporter: Emmanuel Joke
> Assignee: Emmanuel Joke
> Fix For: 1.0.0
>
> Attachments: NUTCH-530.patch
>
>
> We have a lot of similar links with status "linked" generated at the ouput of
> the map task when we try to update the crawldb based on the segment fetched.
> We can use a combiner to improve the performance.
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