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https://issues.apache.org/jira/browse/SOLR-2222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929577#action_12929577
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Andreas Laager commented on SOLR-2222:
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I've read this that Lucene does not care about the unique key. But where does
the uniqueKey configuration in the schema.xml come from? Is that part of SOLR?
If yes then also SOLR should also care about it on merging cores.
Our system is using solr with a live core dedicated for inserts that gets
merged into a search core from time to time. We expect a better search
performance out of this. I expect a negativ performance impact when I have to
handle all the duplicated documents after the merge.
> Merge duplicates documents with uniqueKey
> -----------------------------------------
>
> Key: SOLR-2222
> URL: https://issues.apache.org/jira/browse/SOLR-2222
> Project: Solr
> Issue Type: Bug
> Affects Versions: 1.4.1
> Reporter: Andreas Laager
>
> When merging one core into an other one could get multiple documents for one
> uniqueKey. As a result the facet counts are wrong.
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