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https://issues.apache.org/jira/browse/NUTCH-627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Otis Gospodnetic updated NUTCH-627:
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Attachment: NUTCH-627.patch
> Minimize host address lookup
> ----------------------------
>
> Key: NUTCH-627
> URL: https://issues.apache.org/jira/browse/NUTCH-627
> Project: Nutch
> Issue Type: Improvement
> Components: generator
> Reporter: Otis Gospodnetic
> Attachments: NUTCH-627.patch
>
>
> The simple patch that I'm about to attach keeps track of hosts whose "max
> URLs per host" limit we already reached, as well as hosts whose hostname->IP
> lookup already failed. For such hosts, further DNS lookups are skipped:
> - there is no point in looking up a hostname yet again if we already have the
> max number of URLs for that host
> - there is little point in attempting to look up a hostname yet again if the
> previous lookup already failed
> In a simple test, this saved a few hundred thousand lookups for the first
> case and a few hundred lookups for the second case.
> If nobody complains, I'll commit by the end of the week.
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