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https://issues.apache.org/jira/browse/SOLR-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260071#comment-14260071
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Alan Woodward commented on SOLR-6840:
-------------------------------------

Hey, sorry have been away from internet, and then ill.

I've moved on a bit from the patch I posted above.  Removing the default core 
from solr.xml has uncovered a few other API corners that I'd like to smooth 
over (SOLR-6894 being the first of these).  I'll try and get up to date in the 
next couple of days, and then maybe we can open a branch and divide the work up 
a bit?

What I really want to do is make this work programmatically (ie, the test cases 
create cores using the CoreAdmin or CollectionAdmin API) rather than just 
copying files all over the place.  Otherwise you end up like we are now, with 
almost all distributed tests relying on the test classes knowing the 
implementation details of how cores or collections are set up, meaning that 
they all have to be changed when those implementation details change.

> 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
>
>
> 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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