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https://issues.apache.org/jira/browse/SOLR-11508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277497#comment-16277497
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David Smiley commented on SOLR-11508:
-------------------------------------

Perhaps solr.data.dir should be deprecated in SolrCloud mode (displaying a 
warning at startup)?  In 8.0 we could remove the "-t" convenience parameter to 
bin/solr, leaving it as more of an internal setting.

> Make coreRootDirectory configurable via an environment variable 
> (SOLR_CORE_HOME)
> --------------------------------------------------------------------------------
>
>                 Key: SOLR-11508
>                 URL: https://issues.apache.org/jira/browse/SOLR-11508
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Marc Morissette
>
> (Heavily edited)
> Since Solr 7, it is possible to store Solr cores in separate disk locations 
> using solr.data.home (see SOLR-6671). This is very useful when running Solr 
> in Docker where data must be stored in a directory which is independent from 
> the rest of the container.
> While this works well in standalone mode, it doesn't in Cloud mode as the 
> core.properties automatically created by Solr are still stored in 
> coreRootDirectory and cores created that way disappear when the Solr Docker 
> container is redeployed.
> The solution is to configure coreRootDirectory to an empty directory that can 
> be mounted outside the Docker container.
> The incoming patch makes this easier to do by allowing coreRootDirectory to 
> be configured via a solr.core.home system property and SOLR_CORE_HOME 
> environment variable.



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