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https://issues.apache.org/jira/browse/NUTCH-1418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405223#comment-13405223
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Ken Krugler commented on NUTCH-1418:
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The path is invalid, so Nutch emitting a warning is fine.
If Nutch subsequently bails on processing URLs for such a web site, then that
would be a problem - but I don't think that's the case here, as it's being
logged as a warning, not an error, and it obviously keeps processing the file
(since you get three such warnings).
Are you _sure_ that the reason Nutch isn't fetching is caused by this issue
with robots.txt? I'm pretty sure many people use Nutch to crawl Wikipedia.
> error parsing robots rules- can't decode path:
> /wiki/Wikipedia%3Mediation_Committee/
> ------------------------------------------------------------------------------------
>
> Key: NUTCH-1418
> URL: https://issues.apache.org/jira/browse/NUTCH-1418
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 1.4
> Reporter: Arijit Mukherjee
>
> Since learning that nutch will be unable to crawl the javascript function
> calls in href, I started looking for other alternatives. I decided to crawl
> http://en.wikipedia.org/wiki/Districts_of_India.
> I first tried injecting this URL and follow the step-by-step approach
> till fetcher - when I realized, nutch did not fetch anything from this
> website. I tried looking into logs/hadoop.log and found the following 3 lines
> - which I believe could be saying that nutch is unable to parse the
> robots.txt in the website and ttherefore, fetcher stopped?
>
> 2012-07-02 16:41:07,452 WARN api.RobotRulesParser - error parsing robots
> rules- can't decode path: /wiki/Wikipedia%3Mediation_Committee/
> 2012-07-02 16:41:07,452 WARN api.RobotRulesParser - error parsing robots
> rules- can't decode path: /wiki/Wikipedia_talk%3Mediation_Committee/
> 2012-07-02 16:41:07,452 WARN api.RobotRulesParser - error parsing robots
> rules- can't decode path: /wiki/Wikipedia%3Mediation_Cabal/Cases/
> I tried checking the URL using parsechecker and no issues there! I think
> it means that the robots.txt is malformed for this website, which is
> preventing fetcher from fetching anything. Is there a way to get around this
> problem, as parsechecker seems to go on its merry way parsing.
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