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From "Sebastian Nagel (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1854) ./bin/crawl fails with a parsing fetcher
Date Thu, 09 Apr 2015 09:25:12 GMT


Sebastian Nagel commented on NUTCH-1854:

Definitely: and fetcher.parse=false are mutually exclusive in
"normal" crawler work-flows. There are others where this combination makes sense, e.g., check
availability of URLs, do network load tests, etc. I don't think we can make the work-flow
(bin/crawl) safe from any misconfigurations, at least, when it's about manually editing properties
(would be different with a config GUI). It's important to provide meaningful messages for
common errors (cf. NUTCH-1370 if seeds are excluded by URL filters).
+1 for skipping already parsed segments does not harm but
* message that parsing segment is skipped should be a warning - it's still a misconfiguration!
* the "finished at ..., elapsed ..." message is misleading if a segment is skipped
* ev. add the checking code to SegmentChecker (NUTCH-1771)

> ./bin/crawl fails with a parsing fetcher
> ----------------------------------------
>                 Key: NUTCH-1854
>                 URL:
>             Project: Nutch
>          Issue Type: Bug
>          Components: parser
>    Affects Versions: 1.9
>            Reporter: Lewis John McGibbney
>            Assignee: Lewis John McGibbney
>             Fix For: 1.11
>         Attachments: NUTCH-1854ver1.patch
> If you run ./bin/crawl with a parsing fetcher e.g.
> <property>
> >   <name>fetcher.parse</name>
> >   <value>false</value>
> >   <description>If true, fetcher will parse content. Default is false,
> > which means
> >   that a separate parsing step is required after fetching is
> > finished.</description>
> > </property>
> we get a horrible message as follows
> Exception in thread "main" Segment already parsed!
> We could improve this by making logging more complete and by adding a trigger to the
crawl script which would check for crawl_parse for a given segment and then skip parsing if
this is present.

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