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https://issues.apache.org/jira/browse/SOLR-6909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14281533#comment-14281533
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Yonik Seeley commented on SOLR-6909:
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Thanks Steve, I've been meaning to extract that logic for some time now...
I've also slapped an experimental tag on the class to allow easy modification 
in the future.

> Allow pluggable atomic update merging logic
> -------------------------------------------
>
>                 Key: SOLR-6909
>                 URL: https://issues.apache.org/jira/browse/SOLR-6909
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Steve Davids
>             Fix For: 5.0, Trunk
>
>         Attachments: SOLR-6909.patch, SOLR-6909.patch
>
>
> Clients should be able to introduce their own specific merging logic by 
> implementing a new class that will be used by the DistributedUpdateProcessor. 
> This is particularly useful if you require a custom hook to interrogate the 
> incoming document with the document that is already resident in the index as 
> there isn't the ability to perform that operation nor can you currently 
> extend the DistributedUpdateProcessor to provide the modifications.



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