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https://issues.apache.org/jira/browse/NUTCH-2445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16215168#comment-16215168
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Sebastian Nagel commented on NUTCH-2445:
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+1
> Fetcher following outlinks to keep track of already fetched items
> -----------------------------------------------------------------
>
> Key: NUTCH-2445
> URL: https://issues.apache.org/jira/browse/NUTCH-2445
> Project: Nutch
> Issue Type: Improvement
> Affects Versions: 1.13
> Reporter: Markus Jelsma
> Assignee: Markus Jelsma
> Fix For: 1.14
>
> Attachments: NUTCH-2445.patch, NUTCH-2445.patch
>
>
> When fetcher.follow.outlinks.depth is non-zero, fetcher follows outlinks.
> This patch keeps track of already fetched URL's and thus avoid fetching the
> same URL twice.
> A Set is used to keep track of them, hashcodes to reduce memory usage. This
> is not used if fetcher doesn't follow outlinks.
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