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https://issues.apache.org/jira/browse/NUTCH-601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565822#action_12565822
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Andrzej Bialecki commented on NUTCH-601:
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I think the section that handles the presence of an old merged index is not
needed - we want to re-create it anyway, and if something bad happens it's
better not to leave the old index with the new dbs/segments. So I think it's
best to remove the merged index the same way as you remove the partial indexes.
> 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, NUTCH-601v0.2.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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