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https://issues.apache.org/jira/browse/SOLR-13365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ishan Chattopadhyaya updated SOLR-13365:
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Fix Version/s: (was: 8.1)
8.2
> 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
> Priority: Major
> Fix For: master (9.0), 8.2
>
>
> 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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