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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-601) Recrawling on existing crawl directory using force option
Date Mon, 04 Feb 2008 18:19:08 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565453#action_12565453
] 

Andrzej Bialecki  commented on NUTCH-601:
-----------------------------------------

Thank you for creating this issue. I think that perhaps the old behavior should be removed
altogether - it was based on an assumption that users don't want by default to recrawl the
same pages. Our experience as a community shows that this is usually not the case, and the
old behavior is confusing - so why not remove this artificial limitation altogether, and if
users do want to keep each cycle in a separate directory they can do this by specifying different
output directories.

> Recrawling on existing crawl directory using force option
> ---------------------------------------------------------
>
>                 Key: NUTCH-601
>                 URL: https://issues.apache.org/jira/browse/NUTCH-601
>             Project: Nutch
>          Issue Type: Improvement
>    Affects Versions: 1.0.0
>            Reporter: Susam Pal
>            Priority: Minor
>         Attachments: NUTCH-601v0.1.patch
>
>
> Added a '-force' option to the 'bin/nutch crawl' command line. With this option, one
can crawl and recrawl in the following manner:
> {code}
> bin/nutch crawl urls -dir crawl -depth 2 -topN 10 -threads 5
> bin/nutch crawl urls -dir crawl -depth 2 -topN 10 -threads 5 -force
> {code}
> This option can be used for the first crawl too:
> {code}
> bin/nutch crawl urls -dir crawl -depth 2 -topN 10 -threads 5 -force
> bin/nutch crawl urls -dir crawl -depth 2 -topN 10 -threads 5 -force
> {code}
> If one tries to crawl without the -force option when the crawl directory already exists,
he/she finds a small warning along with the error message:
> {code}
> # bin/nutch crawl urls -dir crawl -depth 2 -topN 10 -threads 5
> Exception in thread "main" java.lang.RuntimeException: crawl already
> exists. Add -force option to recrawl.
>        at org.apache.nutch.crawl.Crawl.main(Crawl.java:89)
> {code}

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