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From "Sami Siren (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-61) Adaptive re-fetch interval. Detecting umodified content
Date Wed, 17 Jan 2007 18:38:30 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-61?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465493
] 

Sami Siren commented on NUTCH-61:
---------------------------------

Havent looked the patch (tm)

How would one manage segments after something linke this gets included, i mean now it's more
or less safe to delete segments older than configured refetch interval + some marginal,  but
after the lifetime of page can vary there's no more such a simple way to manage fetched data.


> 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 
>         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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