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https://issues.apache.org/jira/browse/SOLR-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14269410#comment-14269410
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Alan Woodward commented on SOLR-6840:
-------------------------------------

So the problem with Cloud setups appears to be due to the control jetty.  
Previously, the cores for all the jetties were being predefined in solr.xml, so 
the cluster came up automatically with cores in place.  However, now I'm 
creating the test collections with a CollectionAdmin request, and this means 
that cores sometimes get created on the control jetty, as it's part of the 
cluster.  This then causes failures further down the line.

So my question really is, what's the purpose of the control jetty here?  In 
non-cloud distributed tests, it's there to check that distributed results are 
the same as results from a single core.  In cloud tests, we have the 
singly-sharded control collection for this.  Should I be setting it up so that 
the control Jetty doesn't join the cluster at all?  

> 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
>
>
> 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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