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From Doğacan Güney (JIRA) <>
Subject [jira] Commented: (NUTCH-628) Host database to keep track of host-level information
Date Fri, 18 Apr 2008 18:40:21 GMT


Doğacan Güney commented on NUTCH-628:

+1 for extracting hostdb from crawldb...

(also, do we really want to make hostdb just a map file of <Text,MapWritable>? IMHO,
it would be better to design a proper HostDatum class with some statistics built-in, and then
maybe a Metadata element [I guess it's just me but I hate MapWritable, I prefer Metadata:D])

> Host database to keep track of host-level information
> -----------------------------------------------------
>                 Key: NUTCH-628
>                 URL:
>             Project: Nutch
>          Issue Type: New Feature
>          Components: fetcher, generator
>            Reporter: Otis Gospodnetic
>         Attachments: NUTCH-628-DomainStatistics.patch, NUTCH-628-HostDb.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
> 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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