Shalin Shekhar Mangar created SOLR-11990:

             Summary: Make it possible to co-locate replicas of multiple 
collections together in a node using policy
                 Key: SOLR-11990
             Project: Solr
          Issue Type: Sub-task
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling, SolrCloud
            Reporter: Shalin Shekhar Mangar
             Fix For: master (8.0), 7.3

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.
{"replica":1, "collection":"A", "shard":"#EACH", "withCollection":"B"}

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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