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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4478) Allow cores to specify a named config set
Date Wed, 17 Jul 2013 14:14:58 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711122#comment-13711122
] 

Erick Erickson commented on SOLR-4478:
--------------------------------------

bq: we add an option at core creation time to use the configset as a template, rather than
sharing it, which copies the configset contents into the new core's config directory

-1 as an initial reaction as stated. I _really_ don't want to have a command that creates
a mixed set of config sets and local-to-core configurations, if they want that control they
can do it manually. And the +1 below keeps things more congruent with SolrCloud.

+1 if we change it slightly. Use a template, but copy it to the config set directory with
a new name and use _that_.

BTW, the tentative directory structure is 
<solr_home>/configs/configset1
<solr_home>/configs/configset2
and so on, so copying from one to another should be straight-forward.

In fact it's an open question (at least to me) whether we support local-to-core configurations
in 5.0 or require config sets. We could support both, which is used is controlled by the presence/absence
of a "configName" parameter in the core definition (<core now, but configName in core.properties)
                
> Allow cores to specify a named config set
> -----------------------------------------
>
>                 Key: SOLR-4478
>                 URL: https://issues.apache.org/jira/browse/SOLR-4478
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 4.2, 5.0
>            Reporter: Erick Erickson
>            Assignee: Erick Erickson
>         Attachments: SOLR-4478.patch, SOLR-4478.patch
>
>
> Part of moving forward to "the new way", after SOLR-4196 etc... I propose an additional
parameter specified on the <core> node in solr.xml or as a parameter in the "discovery"
mode core.properties file, call it configSet, where the value provided is a path to a directory,
either absolute or relative. Really, this is as though you copied the conf directory somewhere
to be used by more than one core.
> Straw-man: There will be a directory <solr_home>/configsets which will be the default.
If the configSet parameter is, say, "myconf", then I'd expect a directory named "myconf" to
exist in <solr_home>/configsets, which would look something like
> <solr_home>/configsets/myconf/schema.xml
>                               solrconfig.xml
>                               stopwords.txt
>                               velocity
>                               velocity/query.vm
> etc.
> If multiple cores used the same configSet, schema, solrconfig etc. would all be shared
(i.e. shareSchema="true" would be assumed). I don't see a good use-case for _not_ sharing
schemas, so I don't propose to allow this to be turned off. Hmmm, what if shareSchema is explicitly
set to false in the solr.xml or properties file? I'd guess it should be honored but maybe
log a warning?
> Mostly I'm putting this up for comments. I know that there are already thoughts about
how this all should work floating around, so before I start any work on this I thought I'd
at least get an idea of whether this is the way people are thinking about going.
> Configset can be either a relative or absolute path, if relative it's assumed to be relative
to <solr_home>.
> Thoughts?

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