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https://issues.apache.org/jira/browse/NUTCH-61?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki resolved NUTCH-61.
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Resolution: Fixed
Fix Version/s: 1.0.0
Applied with some modifications in rev. 542903.
> Adaptive re-fetch interval. Detecting umodified content
> -------------------------------------------------------
>
> Key: NUTCH-61
> URL: https://issues.apache.org/jira/browse/NUTCH-61
> Project: Nutch
> Issue Type: New Feature
> Components: fetcher
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Fix For: 1.0.0
>
> Attachments: 20050606.diff, 20051230.txt, 20060227.txt,
> nutch-61-417287.patch, nutch-61-492176.patch
>
>
> Currently Nutch doesn't adjust automatically its re-fetch period, no matter
> if individual pages change seldom or frequently. The goal of these changes is
> to extend the current codebase to support various possible adjustments to
> re-fetch times and intervals, and specifically a re-fetch schedule which
> tries to adapt the period between consecutive fetches to the period of
> content changes.
> Also, these patches implement checking if the content has changed since last
> fetching; protocol plugins are also changed to make use of this information,
> so that if content is unmodified it doesn't have to be fetched and processed.
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