[jira] [Commented] (NUTCH-1483) Can't crawl filesystem with protocol-file plugin

["Sebastian Nagel (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488146#comment-13488146 ] 

Sebastian Nagel commented on NUTCH-1483:
----------------------------------------

Confirmed.
The problem is caused by the rule
{code}
<!-- removes duplicate slashes -->
<regex>
  <pattern>(?&lt;!:)/{2,}</pattern>
  <substitution>/</substitution>
</regex>
{code}
in {{regex-normalize.xml}}: {{file:///var/www/index.html}} is "normalized" to {{file://var/www/index.html}} which fails because with two slashes {{var}} is interpreted as host part of the URL (as in {{http://localhost/index.html}}) and a file {{/www/index.html}} does not exist (=404).
As work-around you can
* either remove (comment out) this rule,
* disable the plugin urlnormalizer-regex,
* or use URLs with only one slash ({{file:/home/user/docs/}}) as seeds (it surprisingly works)

Normalization of {{file://}} URLs needs to be improved but what is the canonical form?
- {{file:///var/}} or {{file:/var}}?
- what about {{file://C:/Documents/}}?
                
> Can't crawl filesystem with protocol-file plugin
> ------------------------------------------------
>
>                 Key: NUTCH-1483
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1483
>             Project: Nutch
>          Issue Type: Bug
>          Components: protocol
>    Affects Versions: 1.6, 2.1
>         Environment: OpenSUSE 12.1, OpenJDK 1.6.0
>            Reporter: Rogério Pereira Araújo
>
> I tried to follow the same steps described in this wiki page:
> http://wiki.apache.org/nutch/IntranetDocumentSearch
> I made all required changes on regex-urlfilter.txt and added the following entry in my seed file:
> file:///home/rogerio/Documents/
> The permissions are ok, I'm running nutch with the same user as folder owner, so nutch has all the required permissions, unfortunately I'm getting the following error:
> org.apache.nutch.protocol.file.FileError: File Error: 404
>         at org.apache.nutch.protocol.file.File.getProtocolOutput(File.java:105)
>         at org.apache.nutch.fetcher.FetcherReducer$FetcherThread.run(FetcherReducer.java:514)
> fetch of file://home/rogerio/Documents/ failed with: org.apache.nutch.protocol.file.FileError: File Error: 404
> Why the logs are showing file://home/rogerio/Documents/ instead of file:///home/rogerio/Documents/ ???
> Note: The regex-urlfilter entry only works as expected if I add the entry 
> +^file://home/rogerio/Documents/ instead of +^file:///home/rogerio/Documents/ as wiki says.

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