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https://issues.apache.org/jira/browse/SOLR-6671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190158#comment-14190158
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Mark Miller commented on SOLR-6671:
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bq. It would allow a cleaner config that doesn't need "../.." on the dataDir.
It also means you don't have to mess with the data dir property on every
SolrCore you create (try doing that with the collections api). Instead you just
set one property and forget about it and do everything normal from then on.
> Introduce a solr.data.root as root dir for all data
> ---------------------------------------------------
>
> Key: SOLR-6671
> URL: https://issues.apache.org/jira/browse/SOLR-6671
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.10.1
> Reporter: Jan Høydahl
> Fix For: 5.0, Trunk
>
> Attachments: 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.root}} 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.root\)/$\{solr.core.name\}/data}}
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