[jira] Commented: (NUTCH-61) Adaptive re-fetch interval. Detecting umodified content

["Otis Gospodnetic (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/NUTCH-61?page=comments#action_12444514 ] 
            
Otis Gospodnetic commented on NUTCH-61:
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Has anyone been using the code with this patch applied?  Just wondering if/how well it works.

> Adaptive re-fetch interval. Detecting umodified content
> -------------------------------------------------------
>
>                 Key: NUTCH-61
>                 URL: http://issues.apache.org/jira/browse/NUTCH-61
>             Project: Nutch
>          Issue Type: New Feature
>          Components: fetcher
>            Reporter: Andrzej Bialecki 
>         Assigned To: Andrzej Bialecki 
>         Attachments: 20050606.diff, 20051230.txt, 20060227.txt, nutch-61-417287.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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