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https://issues.apache.org/jira/browse/SOLR-11508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273245#comment-16273245
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Shawn Heisey commented on SOLR-11508:
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I thought the entire point of solr.data.home was to separate dataDir from
instanceDir, without having to specify dataDir explicitly in every
core.properties file. When using solr.data.home, the instanceDir likely only
contains core.properties and the conf directory, though of course when running
SolrCloud, there is no conf directory.
The core.properties file isn't data, it's config, so I do not think it should
be in the solr.data.home location.
> core.properties should be stored $solr.data.home/$core.name
> -----------------------------------------------------------
>
> 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
>
> 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 where running Solr
> in Docker where data must be stored in a directory which is independent from
> the rest of the container.
> Unfortunately, while core data is stored in
> {{$\{solr.data.home}/$\{core.name}/index/...}}, core.properties is stored in
> {{$\{solr.solr.home}/$\{core.name}/core.properties}}.
> Reading SOLR-6671 comments, I think this was the expected behaviour but I
> don't think it is the correct one.
> In addition to being inelegant and counterintuitive, this has the drawback of
> stripping a core of its metadata and breaking core discovery when a Solr
> installation is redeployed, whether in Docker or not.
> core.properties is mostly metadata and although it contains some
> configuration, this configuration is specific to the core it accompanies. I
> believe it should be stored in solr.data.home, with the rest of the data it
> describes.
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