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https://issues.apache.org/jira/browse/SOLR-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003657#comment-15003657
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Mikhail Khludnev commented on SOLR-4905:
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[~solrtrey] responded to the list, reposting here
bq. Just to add another voice to the discussion, I have the exact same use case
described by Paul and Mikhail that I'm working through a Proof of Concept for
right now. I'd very much like to see the "single shard collection with a
replica on all nodes" restriction removed.
> Allow fromIndex parameter to JoinQParserPlugin to refer to a single-sharded
> collection that has a replica on all nodes
> ----------------------------------------------------------------------------------------------------------------------
>
> 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
> Fix For: 5.1, Trunk
>
> Attachments: SOLR-4905.patch, SOLR-4905.patch, 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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