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https://issues.apache.org/jira/browse/SOLR-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333765#comment-14333765
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Anshum Gupta commented on SOLR-7090:
------------------------------------

I am yet to really look deeper into this but here are a few things:
1. The idea of auto-refreshing every 2 seconds looks scary to me.
2. As Noble mentioned, in case of a cache, the size should be configurable (I 
see a TODO there, would be good to have that).
3. Instead of using FieldCacheSource, make it mandatory for the field to have 
DocValues enabled and then just go with that?

> 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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