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From "Alan Tanaman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (NUTCH-422) index-extra plugin creates additional fields in the index, based on configurable logic
Date Tue, 02 Jan 2007 22:57:27 GMT

    [ http://issues.apache.org/jira/browse/NUTCH-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12461863
] 

Alan Tanaman commented on NUTCH-422:
------------------------------------

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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