[jira] [Created] (SOLR-12846) Policy rules do not support host variable

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

Shalin Shekhar Mangar created SOLR-12846:
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             Summary: Policy rules do not support host variable
                 Key: SOLR-12846
                 URL: https://issues.apache.org/jira/browse/SOLR-12846
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
    Affects Versions: 7.5
            Reporter: Shalin Shekhar Mangar
             Fix For: 7.6, master (8.0)


The policy documentation says that there is a host variable supported in policy rules at https://lucene.apache.org/solr/guide/7_5/solrcloud-autoscaling-policy-preferences.html#node-selection-attributes

But there is no mention of it in the code. Perhaps it got lost during refactorings and there were no tests for it? In any case, we should add it back. It'd be great if we can support #EACH for host so that one can write a rule to distribute replicas across hosts and not just nodes. This would be very useful when one runs multiple Solr JVMs in the same physical node.



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