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https://issues.apache.org/jira/browse/SOLR-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15001977#comment-15001977
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Paul Blanchaert commented on SOLR-4905:
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Today, I came across the same issue as reported by Mikhail Khludnev ("SolrCloud
join: multiple shards not yet supported join").
I would expect that there is no issue to perform a cross-core join over sharded
collections when the following conditions are met:
1) both collections are sharded with the same replicationFactor and numShards
2) router.field of the collection is set to the same "key-field"
3) the cross-core join is based on that same (from/to) "key-field"
The router.field setup ensures that documents with the same "key-field" are
routed to the same node.
So the combination based on the "key-field" should always be available within
the same node.
>From a user perspective, I believe these assumptions seem to be the "normal"
>use-case in the cross-core join.
So, when these assumptions are correct, the next question is probably how
feasable it is to implement this logic in the JoinQParserPlugin?
Thanks for your feedback.
> 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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