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https://issues.apache.org/jira/browse/SOLR-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333717#comment-14333717
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Noble Paul commented on SOLR-7090:
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All this stuff goes into memory? I'm just wondering if there is a way to limit
the amount of memory used , instead of throwing an OOM
> Cross collection join
> ---------------------
>
> Key: SOLR-7090
> URL: https://issues.apache.org/jira/browse/SOLR-7090
> Project: Solr
> Issue Type: Bug
> Reporter: Ishan Chattopadhyaya
> Fix For: 5.1
>
> 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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