Hi all, Thank you very much for the replies. Very useful information to understand how incremental crawling can be achieved.
Dear Markus: Can you please tell me how do I over ride this fetch interval , incase if I require to fetch the page before the time interval is passed? Thanks very much - David On Thu, Feb 14, 2013 at 2:57 PM, Markus Jelsma <markus.jel...@openindex.io>wrote: > If you want records to be fetched at a fixed interval its easier to inject > them with a fixed fetch interval. > > nutch.fixedFetchInterval=86400 > > > > -----Original message----- > > From:kemical <mickael.lume...@gmail.com> > > Sent: Thu 14-Feb-2013 10:15 > > To: user@nutch.apache.org > > Subject: Re: Nutch Incremental Crawl > > > > Hi David, > > > > You can also consider setting shorter fetch interval time with nutch > inject. > > This way you'll set higher score (so the url is always taken in priority > > when you generate a segment) and a fetch.interval of 1 day. > > > > If you have a case similar to me, you'll often want some homepage fetch > each > > day but not their inlinks. What you can do is inject all your seed urls > > again (assuming those url are only homepages). > > > > #change nutch option so existing urls can be injected again in > > conf/nutch-default.xml or conf/nutch-site.xml > > db.injector.update=true > > > > #Add metadata to update score/fetch interval > > #the following line will concat to each line of your seed urls files with > > the new score / new interval > > perl -pi -e 's/^(.*)\n$/\1\tnutch.score=100\tnutch.fetchInterval=80000' > > [your_seed_url_dir]/* > > > > #run command > > bin/nutch inject crawl/crawldb [your_seed_url_dir] > > > > Now, the following crawl will take your urls in top priority and crawl > them > > once a day. I've used my situation to illustrate the concept but i guess > you > > can tweek params to fit your needs. > > > > This way is useful when you want a regular fetch on some urls, if it's > > occured rarely i guess freegen is the right choice. > > > > Best, > > Mike > > > > > > > > > > > > -- > > View this message in context: > http://lucene.472066.n3.nabble.com/Nutch-Incremental-Crawl-tp4037903p4040400.html > > Sent from the Nutch - User mailing list archive at Nabble.com. > > >
