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https://issues.apache.org/jira/browse/SOLR-13618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17001691#comment-17001691
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Erick Erickson commented on SOLR-13618:
---------------------------------------

Vincenzo:

Sure, give a whirl. Short form:

when the core admin API instanceDir method is called (note, core admin API, 
_not_ collection API) a couple of things should happen if the instanceDir 
property is specified:

1> make sure instanceDir is a descendant of SOLR_HOME

2> Insure that no _other_ core.properties files exist above or below it, i.e. 
in any directory between instanceDir and SOLR_HOME, or any directory below 
SOLR_HOME.

You're probably looking at CoreContainer.create...

> The core admin API should fail to create a core if the instanceDir is not 
> under SOLR_HOME or a child or ancestor of instanceDir contains core.properties
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-13618
>                 URL: https://issues.apache.org/jira/browse/SOLR-13618
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Talvinder Matharu
>            Priority: Major
>
> When new 'instanceDir' is set outside the SOLR_HOME directory then core will 
> fail to reload after restart as the server only discovers cores within 
> SOLR_HOME, looking for a 'core.properties'.  
> So what we ideally want is to check for all the “core.properties” defined 
> within all 'instanceDir' paths, which may exist outside the SOLR_HOME dir.
>  



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