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https://issues.apache.org/jira/browse/SOLR-4790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650202#comment-13650202
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Mark Miller commented on SOLR-4790:
-----------------------------------
In this case, rather than a new back compat break, this is really an
improvement. In the past, the only legit reason to do this was to reload a core
- but now that's a broken way to reload - u must use the reload method. So
failing is much better than what we do now IMO.
> When defining a core with the same name (discovery mode or not),
> CoreContainer should throw an error
> ----------------------------------------------------------------------------------------------------
>
> Key: SOLR-4790
> URL: https://issues.apache.org/jira/browse/SOLR-4790
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.3, 5.0
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Attachments: SOLR-4790.patch
>
>
> When you define a core with the same name as another core (discovery mode
> definitely, old-style xml probably), last one wins. Which means it's very
> hard to track down what caused the problem.
> What's worse, the last-encountered core replaces the first one, leading to
> cores that change an unexpected index.
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