[jira] [Created] (SOLR-13365) Add autoscaling policy support for balancing cores across all availability zones

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

Shalin Shekhar Mangar created SOLR-13365:
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             Summary: Add autoscaling policy support for balancing cores across all availability zones 
                 Key: SOLR-13365
                 URL: https://issues.apache.org/jira/browse/SOLR-13365
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
            Reporter: Shalin Shekhar Mangar
            Assignee: Shalin Shekhar Mangar
             Fix For: 8.1, master (9.0)


The autoscaling policy supports spreading replicas of a shard across zones (via sysprops) but that by itself does not guarantee that all availability zones are actually used and that too in a balanced way.

For example:
{code}
{replica:#EQUAL, shard:#EACH, sysprop.az:#EACH}
{code}
The above policy might end up using only 2 out of 3 availability zones to spread the replicas (assuming there are enough nodes per zone to not violate any other policy rules) and not generate any violations. So although we still have resilience against the loss of one AZ, we do not keep enough capacity as we could have if we had used all 3 zones equally. In summary, this is a cluster balancing problem.



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