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Posted to dev@nutch.apache.org by "Lewis John McGibbney (JIRA)" <ji...@apache.org> on 2011/07/02 09:31:28 UTC
[jira] [Commented] (NUTCH-628) Host database to keep track of
host-level information
[ https://issues.apache.org/jira/browse/NUTCH-628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13058993#comment-13058993 ]
Lewis John McGibbney commented on NUTCH-628:
--------------------------------------------
>From previous discussion on this ticket I think there is evidence that this class has some useful credentials. The problem is that the issue is still open and that there is no entry for this in current /bin/nutch script. Is it worth while providing a patch for this?
> Host database to keep track of host-level information
> -----------------------------------------------------
>
> Key: NUTCH-628
> URL: https://issues.apache.org/jira/browse/NUTCH-628
> Project: Nutch
> Issue Type: New Feature
> Components: fetcher, generator
> Reporter: Otis Gospodnetic
> Attachments: NUTCH-628-DomainStatistics.patch, NUTCH-628-HostDb.patch, domain_statistics_v2.patch
>
>
> Nutch would benefit from having a DB with per-host/domain/TLD information. For instance, Nutch could detect hosts that are timing out, store information about that in this DB. Segment/fetchlist Generator could then skip such hosts, so they don't slow down the fetch job. Another good use for such a DB is keeping track of various host scores, e.g. spam score.
> From the recent thread on nutch-user@lucene:
> Otis asked:
> > While we are at it, how would one go about implementing this DB, as far as its structures go?
> Andrzej said:
> The easiest I can imagine is to use something like <Text, MapWritable>.
> This way you could store arbitrary information under arbitrary keys.
> I.e. a single database then could keep track of aggregate statistics at
> different levels, e.g. TLD, domain, host, ip range, etc. The basic set
> of statistics could consist of a few predefined gauges, totals and averages.
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