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From "Markus Jelsma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (NUTCH-1980) Jexl expressions for CrawlDbReader
Date Wed, 01 Apr 2015 21:54:53 GMT
Markus Jelsma created NUTCH-1980:
------------------------------------

             Summary: Jexl expressions for CrawlDbReader
                 Key: NUTCH-1980
                 URL: https://issues.apache.org/jira/browse/NUTCH-1980
             Project: Nutch
          Issue Type: New Feature
          Components: crawldb
            Reporter: Markus Jelsma
            Assignee: Markus Jelsma
             Fix For: 1.11


We are already using Jexl expressions to filter records from HostDb dumps and it is really
helpful when your CrawlDb is stuffed with metadata generated by parser filters, in our case
mostly scores generated by classification plugins that run on text or structure.

In the case of the HostDb, it operates on hosts only, so it is easy to collect a set of sites
that host mostly a specific language, pornographic content, or just host topics that your
classifiers are trained for.

By adding this magic to the CrawlDbReader, you can get lists of actual records that contain
the stuff you are looking for.

Most work is already in the HostDb patch so it is easy to translate to individual records.
Patch tomorrow, probably...



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