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https://issues.apache.org/jira/browse/SOLR-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280423#comment-14280423
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Erick Erickson commented on SOLR-6840:
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Alan:
Note that you may not really need to _put_ anything in core.properties. As long
as the file just exists it's sufficient if you're OK with all the values being
defaults. E.g. the name of the directory it's found in becomes the name of the
core etc., at least in the non-cloud case. In cloud mode it probably needs more
though.
FWIW
> Remove legacy solr.xml mode
> ---------------------------
>
> Key: SOLR-6840
> URL: https://issues.apache.org/jira/browse/SOLR-6840
> Project: Solr
> Issue Type: Task
> Reporter: Steve Rowe
> Assignee: Erick Erickson
> Priority: Blocker
> Fix For: 5.0
>
> Attachments: SOLR-6840.patch, SOLR-6840.patch, SOLR-6840.patch,
> SOLR-6840.patch
>
>
> On the [Solr Cores and solr.xml
> page|https://cwiki.apache.org/confluence/display/solr/Solr+Cores+and+solr.xml],
> the Solr Reference Guide says:
> {quote}
> Starting in Solr 4.3, Solr will maintain two distinct formats for
> {{solr.xml}}, the _legacy_ and _discovery_ modes. The former is the format we
> have become accustomed to in which all of the cores one wishes to define in a
> Solr instance are defined in {{solr.xml}} in
> {{<cores><core/>...<core/></cores>}} tags. This format will continue to be
> supported through the entire 4.x code line.
> As of Solr 5.0 this form of solr.xml will no longer be supported. Instead
> Solr will support _core discovery_. [...]
> The new "core discovery mode" structure for solr.xml will become mandatory as
> of Solr 5.0, see: Format of solr.xml.
> {quote}
> AFAICT, nothing has been done to remove legacy {{solr.xml}} mode from 5.0 or
> trunk.
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