[jira] Commented: (NUTCH-628) Host database to keep track of host-level information

["Otis Gospodnetic (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666290#action_12666290 ] 

Otis Gospodnetic commented on NUTCH-628:
----------------------------------------

I'm +1 on getting Domain Stats into 1.0.  The patch will need a small update, I think.

> 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
>             Fix For: 1.1
>
>         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 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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