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https://issues.apache.org/jira/browse/NUTCH-530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516675
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Emmanuel Joke commented on NUTCH-530:
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Actually I don't re-use CrawlDbReducer, I've define a new class as Combiner.
This class aggregates only the score of all CrawlDatum with the status "Linked"
into one CrawlDatum. Its just a part of what CrawlDbReducer do. I've done few
test in different case and it has no impact on the current score.
> 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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