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https://issues.apache.org/jira/browse/SOLR-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16864000#comment-16864000
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Christine Poerschke commented on SOLR-7090:
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bq. ... we've got two cache regenerators with identical implementations:
SolrPluginUtils.IdentityRegenerator (currently showing as unused) and
NoOpRegenerator. ...
The two regenerators were mentioned above. Just cross-referencing here to say
that the former is removed by SOLR-13515 ticket.
> Cross collection join
> ---------------------
>
> Key: SOLR-7090
> URL: https://issues.apache.org/jira/browse/SOLR-7090
> Project: Solr
> Issue Type: New Feature
> Reporter: Ishan Chattopadhyaya
> Priority: Major
> Fix For: 5.2, 6.0
>
> Attachments: SOLR-7090-fulljoin.patch, 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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