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https://issues.apache.org/jira/browse/NUTCH-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13147641#comment-13147641
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Markus Jelsma commented on NUTCH-1180:
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I'll send this in if there are no objections.
> UpdateDB to backup previous CrawlDB
> -----------------------------------
>
> Key: NUTCH-1180
> URL: https://issues.apache.org/jira/browse/NUTCH-1180
> Project: Nutch
> Issue Type: Improvement
> Reporter: Markus Jelsma
> Assignee: Markus Jelsma
> Priority: Minor
> Fix For: 1.5
>
> Attachments: NUTCH-1180-1.5.-1.patch
>
>
> Nutch currently replaces an existing CrawlDB with the new CrawlDB. By
> optionally keeping a previous version on HDFS users can easily revert in case
> of a mistake without relying on external backup mechanims.
> This should be enabled by default.
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