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https://issues.apache.org/jira/browse/SOLR-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653484#action_12653484
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Yonik Seeley commented on SOLR-799:
-----------------------------------

Why not plug in an entirely new chain?  That is one of the way it would be done 
for users of this component, right?

  <updateRequestProcessorChain name="hash"> [...]

And then in the test send in update.processor=hash as a parameter.

> Add support for hash based exact/near duplicate document handling
> -----------------------------------------------------------------
>
>                 Key: SOLR-799
>                 URL: https://issues.apache.org/jira/browse/SOLR-799
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Mark Miller
>            Priority: Minor
>         Attachments: SOLR-799.patch, SOLR-799.patch, SOLR-799.patch
>
>
> Hash based duplicate document detection is efficient and allows for blocking 
> as well as field collapsing. Lets put it into solr. 
> http://wiki.apache.org/solr/Deduplication

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