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https://issues.apache.org/jira/browse/NUTCH-233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dennis Kubes resolved NUTCH-233.
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Resolution: Fixed
The new regex has been added to both the regex-urlfilter.txt and the
crawl-urlfilter.txt files.
> wrong regular expression hang reduce process for ever
> -----------------------------------------------------
>
> Key: NUTCH-233
> URL: https://issues.apache.org/jira/browse/NUTCH-233
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Stefan Groschupf
> Priority: Blocker
> Fix For: 0.9.0
>
>
> Looks like that the expression ".*(/.+?)/.*?\1/.*?\1/" in regex-urlfilter.txt
> wasn't compatible with java.util.regex that is actually used in the regex url
> filter.
> May be it was missed to change it when the regular expression packages was
> changed.
> The problem was that until reducing a fetch map output the reducer hangs
> forever since the outputformat was applying the urlfilter a url that causes
> the hang.
> 060315 230823 task_r_3n4zga at
> java.lang.Character.codePointAt(Character.java:2335)
> 060315 230823 task_r_3n4zga at
> java.util.regex.Pattern$Dot.match(Pattern.java:4092)
> 060315 230823 task_r_3n4zga at
> java.util.regex.Pattern$Curly.match1(Pattern.java:
> I changed the regular expression to ".*(/[^/]+)/[^/]+\1/[^/]+\1/" and now the
> fetch job works. (thanks to Grant and Chris B. helping to find the new regex)
> However may people can review it and can suggest improvements, since the old
> regex would match :
> "abcd/foo/bar/foo/bar/foo/" and so will the new one match it also. But the
> old regex would also match :
> "abcd/foo/bar/xyz/foo/bar/foo/" which the new regex will not match.
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