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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Updated: (NUTCH-61) Adaptive re-fetch interval. Detecting umodified content
Date Fri, 30 Dec 2005 16:07:02 GMT
     [ http://issues.apache.org/jira/browse/NUTCH-61?page=all ]

Andrzej Bialecki  updated NUTCH-61:
-----------------------------------

    Attachment: 20051230.txt

Updated version for the latest mapred branch.

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