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https://issues.apache.org/jira/browse/SOLR-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266319#comment-14266319
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Timothy Potter commented on SOLR-4905:
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Good stuff here ... reminds me of a Map-side JOIN in the Map/Reduce world by
having a smaller dataset locally available for all shards of a larger data set.
I'm cleaning up the patch and adding some unit tests.
> 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
> Assignee: Timothy Potter
> Attachments: patch.txt
>
>
> 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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