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https://issues.apache.org/jira/browse/SOLR-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260242#comment-14260242
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Erick Erickson commented on SOLR-6840:
--------------------------------------

Well, it _was_ Christmas! But hey! There's almost a week between now and 
_really_ getting back to work, get cracking! ;).

NP, I happily went off in to the weeds on SOLR-6888 anyway.

bq: with almost all distributed tests relying on the test classes knowing the 
implementation details of how cores or collections are set up

Huge +1. It's _really_ annoying to try to untangle all of that. Not to mention 
the number of places that have their _own_ solr.xml as a string in the test 
case.....

bq:  then maybe we can open a branch and divide the work up a bit

Works for me. And anyone else who wants to chime in......

> 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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