You are viewing a plain text version of this content. The canonical link for it is here.
Posted to user@nutch.apache.org by og...@yahoo.com on 2006/07/07 18:50:23 UTC
Re: [Nutch-general] Link db (traversal + modification)
Thanks Stefan.
So one has to iterate and re-write the whole graph, and there is no way to just modify it on the fly by, for example, removing specific links/pages?
Thanks,
Otis
----- Original Message ----
From: Stefan Groschupf <sg...@media-style.com>
To: nutch-user@lucene.apache.org
Sent: Friday, July 7, 2006 1:52:24 AM
Subject: Re: [Nutch-general] Link db (traversal + modification)
Hi Otis,
the link graph live in the linkdb.
I suggest to write a small map reduce tool that reads the existing
linkDb filter the pages you want to remove and write the result back
to disk.
This will be just a couble lines of code.
The hadoop package comes with some nice map reduce examples.
Stefan
On 06.07.2006, at 22:47, <og...@yahoo.com> wrote:
> Hi,
>
> What's the best way to travere the graph of all fetched pages and
> optionally modify it (e.g. remove a page because you know it's spam)?
> I looked at various Nutch classes, and only LinksDbReader looks
> like it let's you iterate through all links (and for each link get
> its inlinks). Is this right?
>
> But how would one go about modifying the links db?
> Perhaps I should be asking about where/how the links db is stored
> on disk, and whether one should just access and modify that data
> directly on disk?
>
> Thanks,
> Otis
>
>
>
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Nutch-general mailing list
Nutch-general@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nutch-general
Re: [Nutch-general] Link db (traversal + modification)
Posted by kevin <ke...@gmail.com>.
Thanks!
But if I just delete the webdb.old directory and recrawl, the following
exception will happen:
run java in J:\Java\jdk1.5.0_06
060709 094218 parsing
file:/D:/cygwin/home/nutch-0.7.2/conf/nutch-default.xml
060709 094218 parsing file:/D:/cygwin/home/nutch-0.7.2/conf/crawl-tool.xml
060709 094218 parsing file:/D:/cygwin/home/nutch-0.7.2/conf/nutch-site.xml
060709 094218 No FS indicated, using default:local
Exception in thread "main" java.lang.RuntimeException: fqjoke2 already
exists.
at org.apache.nutch.tools.CrawlTool.main(CrawlTool.java:121)
It's very strange! All the crawl jobs I can do before now can't work,
always show the above exception.
Regards!
Honda-Search Administrator 写道:
> Looks like you cancelled a previous crawl in the middle of it, or
> something else did.
>
> delete the D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb.old
> directory and recrawl. You should be fine.
>
>
> ----- Original Message ----- From: "kevin" <ke...@gmail.com>
> To: <nu...@lucene.apache.org>
> Sent: Saturday, July 08, 2006 3:34 AM
> Subject: Re: [Nutch-general] Link db (traversal + modification)
>
>
>> Hi,
>>
>> I ran nutch using this command:
>> $ ./nutch crawl urlfq2.txt -dir fqjoke2 -depth 20 -threads 10 >& fq2.log
>> during the crawling ,the following exception occured:
>>
>> 060708 182413 status: segment 20060708181314, 471 pages, 69 errors,
>> 5655871 bytes, 657469 ms
>> 060708 182413 status: 0.7163836 pages/s, 67.20696 kb/s, 12008.219
>> bytes/page
>> 060708 182414 Updating D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db
>> Exception in thread "main" java.io.IOException: Impossible condition:
>> directories D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb.old and
>> D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb cannot exist
>> simultaneously
>> at org.apache.nutch.db.WebDBWriter.<init>(WebDBWriter.java:1484)
>> at org.apache.nutch.db.WebDBWriter.<init>(WebDBWriter.java:1457)
>> at
>> org.apache.nutch.tools.UpdateDatabaseTool.main(UpdateDatabaseTool.java:360)
>>
>> at org.apache.nutch.tools.CrawlTool.main(CrawlTool.java:141)
>>
>>
>>
>> why this happened ? any solution available? many thanks!
>>
>>
>
>
Re: [Nutch-general] Link db (traversal + modification)
Posted by Honda-Search Administrator <ad...@honda-search.com>.
Looks like you cancelled a previous crawl in the middle of it, or something
else did.
delete the D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb.old directory and
recrawl. You should be fine.
----- Original Message -----
From: "kevin" <ke...@gmail.com>
To: <nu...@lucene.apache.org>
Sent: Saturday, July 08, 2006 3:34 AM
Subject: Re: [Nutch-general] Link db (traversal + modification)
> Hi,
>
> I ran nutch using this command:
> $ ./nutch crawl urlfq2.txt -dir fqjoke2 -depth 20 -threads 10 >& fq2.log
> during the crawling ,the following exception occured:
>
> 060708 182413 status: segment 20060708181314, 471 pages, 69 errors,
> 5655871 bytes, 657469 ms
> 060708 182413 status: 0.7163836 pages/s, 67.20696 kb/s, 12008.219
> bytes/page
> 060708 182414 Updating D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db
> Exception in thread "main" java.io.IOException: Impossible condition:
> directories D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb.old and
> D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb cannot exist
> simultaneously
> at org.apache.nutch.db.WebDBWriter.<init>(WebDBWriter.java:1484)
> at org.apache.nutch.db.WebDBWriter.<init>(WebDBWriter.java:1457)
> at
> org.apache.nutch.tools.UpdateDatabaseTool.main(UpdateDatabaseTool.java:360)
> at org.apache.nutch.tools.CrawlTool.main(CrawlTool.java:141)
>
>
>
> why this happened ? any solution available? many thanks!
>
>
Re: [Nutch-general] Link db (traversal + modification)
Posted by kevin <ke...@gmail.com>.
Hi,
I ran nutch using this command:
$ ./nutch crawl urlfq2.txt -dir fqjoke2 -depth 20 -threads 10 >& fq2.log
during the crawling ,the following exception occured:
060708 182413 status: segment 20060708181314, 471 pages, 69 errors,
5655871 bytes, 657469 ms
060708 182413 status: 0.7163836 pages/s, 67.20696 kb/s, 12008.219 bytes/page
060708 182414 Updating D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db
Exception in thread "main" java.io.IOException: Impossible condition:
directories D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb.old and
D:\cygwin\home\nutch-0.7.2\bin\fqjoke2\db\webdb cannot exist simultaneously
at org.apache.nutch.db.WebDBWriter.<init>(WebDBWriter.java:1484)
at org.apache.nutch.db.WebDBWriter.<init>(WebDBWriter.java:1457)
at
org.apache.nutch.tools.UpdateDatabaseTool.main(UpdateDatabaseTool.java:360)
at org.apache.nutch.tools.CrawlTool.main(CrawlTool.java:141)
why this happened ? any solution available? many thanks!
Re: [Nutch-general] Link db (traversal + modification)
Posted by Honda-Search Administrator <ad...@honda-search.com>.
Otis,
Check out the purge tool (bin/nutch purge)
It's easy to remove URLS individually or based on regular expressions, but
you'll need to learn lucrene syntax to do it.
It will remove certain pages from the index, but won't exclude them from
being recrawled the next time around. For that you'll need to change your
filters in your conf directory.
----- Original Message -----
From: <og...@yahoo.com>
To: <us...@nutch.org>
Sent: Friday, July 07, 2006 9:50 AM
Subject: Re: [Nutch-general] Link db (traversal + modification)
> Thanks Stefan.
> So one has to iterate and re-write the whole graph, and there is no way to
> just modify it on the fly by, for example, removing specific links/pages?
>
> Thanks,
> Otis
>
> ----- Original Message ----
> From: Stefan Groschupf <sg...@media-style.com>
> To: nutch-user@lucene.apache.org
> Sent: Friday, July 7, 2006 1:52:24 AM
> Subject: Re: [Nutch-general] Link db (traversal + modification)
>
> Hi Otis,
>
> the link graph live in the linkdb.
> I suggest to write a small map reduce tool that reads the existing
> linkDb filter the pages you want to remove and write the result back
> to disk.
> This will be just a couble lines of code.
> The hadoop package comes with some nice map reduce examples.
>
> Stefan
>
>
> On 06.07.2006, at 22:47, <og...@yahoo.com> wrote:
>
>> Hi,
>>
>> What's the best way to travere the graph of all fetched pages and
>> optionally modify it (e.g. remove a page because you know it's spam)?
>> I looked at various Nutch classes, and only LinksDbReader looks
>> like it let's you iterate through all links (and for each link get
>> its inlinks). Is this right?
>>
>> But how would one go about modifying the links db?
>> Perhaps I should be asking about where/how the links db is stored
>> on disk, and whether one should just access and modify that data
>> directly on disk?
>>
>> Thanks,
>> Otis
>>
>>
>>
>
>
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job
> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Nutch-general mailing list
> Nutch-general@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nutch-general
>
>
>
>
>
Re: [Nutch-general] Link db (traversal + modification)
Posted by Stefan Groschupf <sg...@media-style.com>.
Hi,
the hadoop io system is read only, so you can not update a file.
However if I'm sure you can hack the link db creation code and add
the url filter that is already used for the crawldb.
May be this is already in the code, if not it would be good since it
minimize spam links to take effect in the ranking.
Stefan
On 07.07.2006, at 09:50, <og...@yahoo.com> wrote:
> Thanks Stefan.
> So one has to iterate and re-write the whole graph, and there is no
> way to just modify it on the fly by, for example, removing specific
> links/pages?
>
> Thanks,
> Otis
>
> ----- Original Message ----
> From: Stefan Groschupf <sg...@media-style.com>
> To: nutch-user@lucene.apache.org
> Sent: Friday, July 7, 2006 1:52:24 AM
> Subject: Re: [Nutch-general] Link db (traversal + modification)
>
> Hi Otis,
>
> the link graph live in the linkdb.
> I suggest to write a small map reduce tool that reads the existing
> linkDb filter the pages you want to remove and write the result back
> to disk.
> This will be just a couble lines of code.
> The hadoop package comes with some nice map reduce examples.
>
> Stefan
>
>
> On 06.07.2006, at 22:47, <og...@yahoo.com> wrote:
>
>> Hi,
>>
>> What's the best way to travere the graph of all fetched pages and
>> optionally modify it (e.g. remove a page because you know it's spam)?
>> I looked at various Nutch classes, and only LinksDbReader looks
>> like it let's you iterate through all links (and for each link get
>> its inlinks). Is this right?
>>
>> But how would one go about modifying the links db?
>> Perhaps I should be asking about where/how the links db is stored
>> on disk, and whether one should just access and modify that data
>> directly on disk?
>>
>> Thanks,
>> Otis
>>
>>
>>
>
>
> Using Tomcat but need to do more? Need to support web services,
> security?
> Get stuff done quickly with pre-integrated technology to make your
> job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
> http://sel.as-us.falkag.net/sel?
> cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Nutch-general mailing list
> Nutch-general@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nutch-general
>
>
>
>