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https://issues.apache.org/jira/browse/SOLR-3998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485257#comment-13485257
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Yonik Seeley commented on SOLR-3998:
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Thanks Eric - I've changed UpdateTest to include this scenario and replicated
what you see.
I think the right thing to do here is probably throw an exception (rather than
ignore the modifiers on the id field).
> 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
> Assignee: Yonik Seeley
> 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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