[jira] [Commented] (SOLR-7090) Cross collection join

["David Smiley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522189#comment-14522189 ] 

David Smiley commented on SOLR-7090:
------------------------------------

FYI I noticed we've got two cache regenerators with identical implementations: SolrPluginUtils.IdentityRegenerator (currently showing as unused) and NoOpRegenerator.  I propose we remove the former both because it's currently not used and because referencing from solrconfig.xml is weird due to the inner class reference.

> Cross collection join
> ---------------------
>
>                 Key: SOLR-7090
>                 URL: https://issues.apache.org/jira/browse/SOLR-7090
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Ishan Chattopadhyaya
>             Fix For: Trunk, 5.2
>
>         Attachments: SOLR-7090.patch
>
>
> Although SOLR-4905 supports joins across collections in Cloud mode, there are limitations, (i) the secondary collection must be replicated at each node where the primary collection has a replica, (ii) the secondary collection must be singly sharded.
> This issue explores ideas/possibilities of cross collection joins, even across nodes. This will be helpful for users who wish to maintain boosts or signals in a secondary, more frequently updated collection, and perform query time join of these boosts/signals with results from the primary collection.



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