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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Updated: (NUTCH-61) Adaptive re-fetch interval. Detecting umodified content
Date Sun, 05 Jun 2005 22:00:41 GMT
     [ http://issues.apache.org/jira/browse/NUTCH-61?page=all ]

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

    Attachment: 20050606.diff

The first round:

* change Page to use a 1-byte float, representing fetchInterval in seconds.

* implement a pluggable FetchSchedule, which adjusts fetchInterval and nextFetchTime

* change FetchListTool and UpdateDatabaseTool to use them. NOTE: it appears there was a bug
in FetchListTool, where the fetchlist entries recorded in segments would have their fetchTime
increased by 1 week. This is not needed, only pages in WebDB need this.

* improve status reporting throughout all plugins.

* change plugins to detect if the content is unchanged. If possible, plugins will not fetch
such content, but in any case they will set their status accordingly.

> 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
>
> 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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