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https://issues.apache.org/jira/browse/SOLR-3998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485069#comment-13485069
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Eric Spencer commented on SOLR-3998:
------------------------------------

Obviously, the workaround is to make sure that you don't do an atomic update on 
the uniqueKey field itself (which I was sort of doing by accident anyway). I 
just don't think anything should allow the violating of the uniqueKey.
                
> Atomic update on uniqueKey field itself causes duplicate document
> -----------------------------------------------------------------
>
>                 Key: SOLR-3998
>                 URL: https://issues.apache.org/jira/browse/SOLR-3998
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.0
>         Environment: Windows XP and RH Linux
>            Reporter: Eric Spencer
>         Attachments: solr_atomic_update_unique_key_bug_t.java
>
>
> Issuing an atomic update which includes the uniqueKey field itself will cause 
> Solr to insert a second document with the same uniqueKey thereby violating 
> uniqueness. A non-atomic update will "correct" the document. Attached is a 
> JUnit test case that demonstrates the issue against the collection1 core in 
> the standard Solr download.

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