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https://issues.apache.org/jira/browse/SOLR-11990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar reassigned SOLR-11990:
--------------------------------------------

    Assignee: Shalin Shekhar Mangar

> Make it possible to co-locate replicas of multiple collections together in a 
> node using policy
> ----------------------------------------------------------------------------------------------
>
>                 Key: SOLR-11990
>                 URL: https://issues.apache.org/jira/browse/SOLR-11990
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling, SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>            Priority: Major
>             Fix For: 7.3, master (8.0)
>
>
> It is necessary to co-locate replicas of different collection together in a 
> node when cross-collection joins are performed. The policy rules framework 
> should support this use-case.
> Example: Co-locate exactly 1 replica of collection A in each node where a 
> replica of collection B is present.
> {code}
> {"replica":1, "collection":"A", "shard":"#EACH", "withCollection":"B"}
> {code}
> This requires changing create collection, create shard and add replica APIs 
> as well because we want a replica of collection A to be created first before 
> a replica of collection B is created so that join queries etc are always 
> possible.



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