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From "Chris A. Mattmann (JIRA)" <>
Subject [jira] [Commented] (NUTCH-1854) ./bin/crawl fails with a parsing fetcher
Date Tue, 07 Apr 2015 01:37:13 GMT


Chris A. Mattmann commented on NUTCH-1854:

Hey Lewis, 2 specific issues to point you to:

1. NUTCH-1771 - and the generic class being implemented that could be reused to deal with
checking in a workflow oriented fashion if the parse_text exists or not, and if not, perhaps
then regenerating it, or going through a parse cycle real quick on any urls that don't have
parse_text data.

2. the reason it fails is that it throws an Exception, as Asitang noted, and we can simply
get around this exception by catching it, logging the error, and then correcting for it downstream
in either a crawl (lights out) oriented fashion using NUTCH-1771 and some logic to then call
the ParseJob for any URLs that it is missing on before e.g., IndexingJob, etc.

And yes thanks for the context. I am all for dealing with #1 and #2 above and people like
[~asitang] along with [~chongli] are trying to deal with this too and we can help shepherd
it in.

> ./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
> 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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