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https://issues.apache.org/jira/browse/SOLR-799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Miller updated SOLR-799:
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    Attachment: SOLR-799.patch

Whoops...thought I had posted this. Heres another draft I did a couple weeks 
ago.

Fixes most of the comments brought up. There will need to be another draft - 
leaving the schema test file in for now as its still helpful to me.

No prevent/append etc options here due to all the issues I mentioned, but I do 
have unposted code experimenting in the different directions if we want to try 
to go there anyway.

> 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
>
>
> 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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