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From "Otis Gospodnetic (JIRA)" <>
Subject [jira] Updated: (NUTCH-627) Minimize host address lookup
Date Thu, 10 Apr 2008 04:12:04 GMT


Otis Gospodnetic updated NUTCH-627:

    Attachment: NUTCH-627.patch

> Minimize host address lookup
> ----------------------------
>                 Key: NUTCH-627
>                 URL:
>             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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