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https://issues.apache.org/jira/browse/SOLR-6909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14281517#comment-14281517
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ASF subversion and git services commented on SOLR-6909:
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Commit 1652660 from [~yo...@apache.org] in branch 'dev/trunk'
[ https://svn.apache.org/r1652660 ]
SOLR-6909: Extract atomic update handling logic into AtomicUpdateDocumentMerger
> 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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