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http://issues.apache.org/jira/browse/NUTCH-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12461863
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Alan Tanaman commented on NUTCH-422:
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Many thanks for your feedback.
Do you have any specifics in mind regarding examples? I will try and include
any additional ones that we implement. I know there are a lot of options, but
it is a little hard to see what is unclear from my end -- as I am so involved
in the development, another point-of-view on this is welcome.
;)
Regarding query-extra, we are not currently using the Nutch bean, so the need
has not arisen for us at this point in time, but I can see how that would be
useful. I guess you could adapt one of the existing query-xxxx plugins fairly
easily by having them read the xml configuration file to see what fields are
potentially available in the index.
As for the boost, I included that as it seems like a useful thing to be able to
control the boost of a single field, although we don't need that at this very
moment. The line of code in the org.apache.nutch.indexer.Indexer's
reduce method could be overridden, but I'm not yet sure how that would affect
the overall scoring (scoring is one of my really weak points).
Perhaps one of the scoring experts could give some guidance on this?
> index-extra plugin creates additional fields in the index, based on
> configurable logic
> --------------------------------------------------------------------------------------
>
> Key: NUTCH-422
> URL: http://issues.apache.org/jira/browse/NUTCH-422
> Project: Nutch
> Issue Type: New Feature
> Components: indexer
> Affects Versions: 0.8.1
> Environment: All environments
> Reporter: Alan Tanaman
> Attachments: index-extra-v1.0-bin-java1.5.zip,
> index-extra-v1.0-source.zip
>
>
> Extract from the Readme file:
> A. Introduction
> The index-extra plugin allows you to configure additional fields that you
> wish to be added to the index, based on one of the following sources:
> - The parsed text
> - Meta data fields
> - Previously created document-to-be-indexed fields
> - Plain constant string
> - Java expression combining one or more of the above, and resolving to
> a string
> A regex can also be applied to any of the above, allowing fields to be
> created based on patterns extracted from the source.
> B. Installation
> 1) Binaries only: Copy the 'index-extra' folder within
> index-extra-v1.0-bin-java1.5.zip to NUTCHDIR/build
> Copy the 'index-extra-conf.xml' file to
> NUTCHDIR/conf, and configure
> Enable the plugin by updating the nutch-site.xml file
> 2) Source code: Always refer to the Nutch wiki for detailed
> instructions on building Nutch. In short:
> Copy the 'index-extra' folder within
> index-extra-v1.0-source.zip to NUTCHDIR/src/plugin
> Update the build.xml in NUTCHDIR/src/plugin to
> include plugin
> Update the NUTCHDIR/default.properties file to
> include plugin
> run ant to build
> Copy the 'index-extra-conf.xml' file to
> NUTCHDIR/conf, and configure
> Enable the plugin by updating the nutch-site.xml file
> C. Known Issues
> 1) For this plugin to work correctly on any document field, it is
> necessary to run the other index filters
> first, so that all basic document fields are generated first. To do
> this, configure the indexingfilter.order
> property. (Please see patch NUTCH-421 to enable indexingfilter.order
> property. If this patch is not applied,
> the plugin will still work, but will not be able to use document fields
> created by other index filter plugins.)
> 2) At this stage, field boost can not be used as Nutch scoring overrides
> the field boost with its own
> document-level boost calculation. This occurs at the end of
> org.apache.nutch.indexer.Indexer's reduce method.
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