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https://issues.apache.org/jira/browse/SOLR-4663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622545#comment-13622545
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Hoss Man commented on SOLR-4663:
--------------------------------

Minor Tangent...

bq. ...This would imply that when someone tried to actually do something with 
the offending cores, they'd get a "core not found" message,...

After posting my last comment, it occured to me that even though we are 
tracking core init failures and reporting them in STATUS requests, we are still 
returning 404s when people attempt to use those cores ... i've opened SOLR-4672 
to consier returning a 500 wraped around the init error.
                
> 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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