RE: refetching interval

[Ledio Ago <la...@looksmart.net>]

Hi Michael! Did you get a answer on this one?  It seems like the refetch interval
is hardcoded, no matter what you set it in the config file, since FETCH_GENERATION_DELAY_MS takes effect after the first fetch.

Anybody out there, is this correct, or we are reading this wrong.  If this is correct
then the refeching feature doesn't work.

Thanks,
Ledio

-----Original Message-----
From: Michael Ji [mailto:fji_00@yahoo.com]
Sent: Friday, April 21, 2006 1:26 PM
To: nutch-dev@lucene.apache.org
Subject: refetching interval


Hi,

I am using nutch 07 and found the following code in
FetchListTool.java

private static final long FETCH_GENERATION_DELAY_MS =
7 * 24 * 60 * 60 * 1000;

that means next refetching time is always 7 days
later, no matter what fetch interval setting in
nutch-site.xml,

I feel puzzled. Could any one give me a hint? 

thanks,

Michael,


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webgraph

[YourSoft <yo...@freemail.hu>]

It is an interesting 'webgraph project':
http://webgraph.dsi.unimi.it/

I don't know it is usable or not for nutch link database for link database.

Re: refetching interval

[Andrzej Bialecki <ab...@getopt.org>]

Ledio Ago wrote:
> Hi Michael! Did you get a answer on this one?  It seems like the refetch interval
> is hardcoded, no matter what you set it in the config file, since FETCH_GENERATION_DELAY_MS takes effect after the first fetch.
>
> Anybody out there, is this correct, or we are reading this wrong.  If this is correct
> then the refeching feature doesn't work.
>   

This is not the case (i.e. you are reading this wrong :) ). The 
FETCH_GENERATION_DELAY_MS constant specifies how much time needs to pass 
before Pages already selected to be included in a fetchlist will be 
re-considered for selection again, UNLESS they have been updated with 
updatedb (after fetching).

This is to prevent selecting the same pages, if you run FetchListTool 
twice in a rapid succession - but at the same time, if you lost or 
discarded that fetchlist, not to wait indefinitely. 7 days was 
considered to be a good optimum (some large fetch jobs may run for days, 
so it could be a couple days before you have a chance to run updatedb 
with the results of fetching).

-- 
Best regards,
Andrzej Bialecki     <><
 ___. ___ ___ ___ _ _   __________________________________
[__ || __|__/|__||\/|  Information Retrieval, Semantic Web
___|||__||  \|  ||  |  Embedded Unix, System Integration
http://www.sigram.com  Contact: info at sigram dot com

Re: refetching interval

[YourSoft <yo...@freemail.hu>]

It is an interesting 'webgraph project':
http://webgraph.dsi.unimi.it/

I don't know it is usable or not for nutch link database for link database.