[ 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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