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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11508) core.properties should be stored $solr.data.home/$core.name
Date Fri, 01 Dec 2017 14:07:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16274437#comment-16274437
] 

David Smiley commented on SOLR-11508:
-------------------------------------

bq. ... keep code R/O ...

It's not enough to keep code R/O unless your situation is a predetermined static set of core
names (and not SolrCloud).  Solr writes new cores, and that means a core instance dir with
a core.properties.

bq. ... Core discovery ...

Wether core discovery stays or leaves, I see that as immaterial.  Cores need to live _somewhere_
and Solr puts them in a configurable coreRootDirectory.  Notice it doesn't have the word "discovery"
in it.

RE Docker: I already explained that a custom SOLR_DATA_HOME (to e.g. a volume) doesn't solve
the docker/volume problem since Solr (in either mode) will write core.properties to the coreRootDirectory
which is not in SOLR_DATA_HOME.

> 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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