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https://issues.apache.org/jira/browse/NUTCH-761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julien Nioche updated NUTCH-761:
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Attachment: optiCrawlReducer.patch
> Avoid cloningCrawlDatum in CrawlDbReducer
> ------------------------------------------
>
> Key: NUTCH-761
> URL: https://issues.apache.org/jira/browse/NUTCH-761
> Project: Nutch
> Issue Type: Improvement
> Reporter: Julien Nioche
> Priority: Minor
> Attachments: optiCrawlReducer.patch
>
>
> In the huge majority of cases the CrawlDbReducer gets unique CrawlData in its
> reduce phase and these will be the entries coming from the crawlDB and not
> present in the segments.
> The patch attached optimizes the reduce step by avoid an unnecessary cloning
> of the CrawlDatum fields when there is only one CrawlDatum in the values.
> This has more impact has the crawlDB gets larger, we noticed an improvement
> of around 25-30% in the time spent in the reduce phase.
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