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Paul Blanchaert commented on SOLR-4905: --------------------------------------- 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org