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https://issues.apache.org/jira/browse/SOLR-269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511195
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Ryan McKinley commented on SOLR-269:
------------------------------------

Hymm.  the behavior on trunk is:
<requestHandler name="/customupdate" class="solr.XmlUpdateRequestHandler" >
   <str name="update.processor.factory">class name for factory</str>
 </requestHandler> 
The latest patch has the argument lookup an XML configured factory.

Do you mean:

 <requestHandler name="/customupdate" class="solr.XmlUpdateRequestHandler" >
    <lst name="invariants">
      <str name="update.processor">standard</str>
    </lst>
 </requestHandler> 

Given the direction we are heading, it seems nice to be able to change the 
update behavior from:
 /update?update.processor=do-fancy-document-cleanup
 /update?update.processor=go-quick-i-know-the-docs-are-clean

I made it a 1-1 relation (processor-handler) to avoid a hash lookup for each 
request, but from a pram would be ok.



> UpdateRequestProcessorFactory - process requests before submitting them
> -----------------------------------------------------------------------
>
>                 Key: SOLR-269
>                 URL: https://issues.apache.org/jira/browse/SOLR-269
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Ryan McKinley
>            Assignee: Ryan McKinley
>             Fix For: 1.3
>
>         Attachments: SOLR-269-UpdateRequestProcessorFactory.patch, 
> SOLR-269-UpdateRequestProcessorFactory.patch, 
> SOLR-269-UpdateRequestProcessorFactory.patch, UpdateProcessor.patch
>
>
> A simple UpdateRequestProcessor was added to a bloated SOLR-133 commit. 
> An UpdateRequestProcessor lets clients plug in logic after a document has 
> been parsed and before it has been 'updated' with the index.  This is a good 
> place to add custom logic for:
>  * transforming the document fields
>  * fine grained authorization (can user X updated document Y?)
>  * allow update, but not delete (by query?)
>    <requestHandler name="/update" class="solr.StaxUpdateRequestHandler" >
>      <str 
> name="update.processor.class">org.apache.solr.handler.UpdateRequestProcessor</str>
>      <lst name="update.processor.args">
>       ... (optionally pass in arguments to the factory init method) ...
>      </lst> 
>    </requestHandler>
> http://www.nabble.com/Re%3A-svn-commit%3A-r547495---in--lucene-solr-trunk%3A-example-solr-conf-solrconfig.xml-src-java-org-apache-solr-handler-StaxUpdateRequestHandler.java-src-java-org-apache-solr-handler-UpdateRequestProcessor.jav-tf3950072.html#a11206583

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