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https://issues.apache.org/jira/browse/SOLR-4663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622367#comment-13622367
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Yonik Seeley commented on SOLR-4663:
------------------------------------

Think about creating a core via API... pointing at another core's data 
directory should only only cause the create of that new core to fail.
Likewise, if someone messes with a core's configuration such that it fails on 
startup, it doesn't seem like this should stop the other correctly configured 
cores from loading.

                
> Log an error if more than one core points to the same data dir.
> ---------------------------------------------------------------
>
>                 Key: SOLR-4663
>                 URL: https://issues.apache.org/jira/browse/SOLR-4663
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 4.3, 5.0
>            Reporter: Erick Erickson
>            Assignee: Erick Erickson
>            Priority: Minor
>         Attachments: SOLR-4663.patch
>
>
> In large multi-core setups, having mistakes whereby two or more cores point 
> to the same data dir seems quite possible. We should at least complain very 
> loudly in the logs if this is detected.
> Should be a very straightforward check at core discovery time.
> Is this serious enough to keep Solr from coming up at all?

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