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https://issues.apache.org/jira/browse/SOLR-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677572#comment-13677572
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Philip K. Warren commented on SOLR-4905:
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In our current configuration, both of the cores are in the same JVM. Both are 
single-shard collections with a replica. I understand however that it is not 
likely to be implemented for SolrCloud without a better story for distributed 
search.

Thanks for the information.
                
> Cross core joins don't work for SolrCloud collections and/or aliases
> --------------------------------------------------------------------
>
>                 Key: SOLR-4905
>                 URL: https://issues.apache.org/jira/browse/SOLR-4905
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Philip K. Warren
>
> Using a non-SolrCloud setup, it is possible to perform cross core joins 
> (http://wiki.apache.org/solr/Join). When testing with SolrCloud, however, 
> neither the collection name, alias name (we have created aliases to SolrCloud 
> collections), or the automatically generated core name (i.e. 
> <collection>_shard1_replica1) work as the fromIndex parameter for a 
> cross-core join.

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