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https://issues.apache.org/jira/browse/SOLR-6671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16052053#comment-16052053
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Mark Miller commented on SOLR-6671:
-----------------------------------

I've only read through the changes, but looks okay to me.

> Introduce a solr.data.home as root dir for all data
> ---------------------------------------------------
>
>                 Key: SOLR-6671
>                 URL: https://issues.apache.org/jira/browse/SOLR-6671
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>    Affects Versions: 4.10.1
>            Reporter: Jan Høydahl
>            Assignee: Jan Høydahl
>             Fix For: master (7.0)
>
>         Attachments: SOLR-6671.patch, SOLR-6671.patch, SOLR-6671.patch, 
> SOLR-6671.patch, SOLR-6671.patch, SOLR-6671.patch, SOLR-6671.patch
>
>
> Many users prefer to deploy code, config and data on separate disk locations, 
> so the default of placing the indexes under 
> {{$\{solr.solr.home\}/$\{solr.core.name\}/data}} is not always wanted.
> In a multi-core/collection system, there is not much help in the 
> {{solr.data.dir}} option, as it would set the {{dataDir}} to the same folder 
> for all collections. One workaround, if you don't want to hardcode paths in 
> your {{solrconfig.xml}}, is to specify the {{dataDir}} property in each 
> {{solr.properties}} file.
> A more elegant solution would be to introduce a new Java-option 
> {{solr.data.home}} which would be to data the same as {{solr.solr.home}} is 
> for config. If set, all collections would default their {{dataDir}} as 
> {{$\{solr.data.home\)/$\{solr.core.name\}/data}}



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