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From "Otis Gospodnetic (JIRA)" <>
Subject [jira] Created: (NUTCH-628) Host database to keep track of host-level information
Date Sat, 12 Apr 2008 04:21:05 GMT
Host database to keep track of host-level information

                 Key: NUTCH-628
             Project: Nutch
          Issue Type: New Feature
          Components: fetcher, generator
            Reporter: Otis Gospodnetic

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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