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https://issues.apache.org/jira/browse/SOLR-6671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14189315#comment-14189315
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Mark Miller commented on SOLR-6671:
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This is similar to the solr.hdfs.home that the HdfsDirectoryFactory exposes to
root SolrCloud instance dirs in one location. Def makes sense to have the same
option for local filesystem given that you really don't want to manage data
directories manually when using SolrCloud if you can help it. That was also a
driving reason behind solr.hdfs.home.
> 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
>
>
> 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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