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https://issues.apache.org/jira/browse/SOLR-5311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13858935#comment-13858935
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Noble Paul commented on SOLR-5311:
----------------------------------

Actually it was an undocumented feature. 
https://cwiki.apache.org/confluence/display/solr/CoreAdminHandler+Parameters+and+Usage



> Avoid registering replicas which are removed 
> ---------------------------------------------
>
>                 Key: SOLR-5311
>                 URL: https://issues.apache.org/jira/browse/SOLR-5311
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>             Fix For: 4.6, 5.0
>
>         Attachments: SOLR-5311.patch, SOLR-5311.patch, SOLR-5311.patch, 
> SOLR-5311.patch, SOLR-5311.patch, SOLR-5311.patch, SOLR-5311.patch
>
>
> If a replica is removed from the clusterstate and if it comes back up it 
> should not be allowed to register. 
> Each core ,when comes up, checks if it was already registered and if yes is 
> it still there. If not ,throw an error and do an unregister . If such a 
> request come to overseer it should ignore such a core



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