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https://issues.apache.org/jira/browse/SOLR-12495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16544922#comment-16544922
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ASF subversion and git services commented on SOLR-12495:
--------------------------------------------------------

Commit 1e50030940c2b089542e180d1abc6af66ac0c947 in lucene-solr's branch 
refs/heads/master from [~noble.paul]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=1e50030 ]

SOLR-12495,SOLR-11986 ref guide


> Enhance the Autoscaling policy syntax to evenly distribute replicas among 
> nodes
> -------------------------------------------------------------------------------
>
>                 Key: SOLR-12495
>                 URL: https://issues.apache.org/jira/browse/SOLR-12495
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>            Priority: Major
>
> Support a new function value for {{replica= "#EQUAL"}}
> {{#EQUAL}} means the equal no:of replicas on each {{"node"}}
> the value of replica will be calculated as  {{<= 
> Math.ceil(number_of_replicas/number_of_valid_nodes) }}
> *example 1:*
> {code:java}
> {"replica" : "#EQUAL" , "shard" : "#EACH" , "node" : "#ANY"}
> {code}
> *case 1* : nodes=3, replicationFactor=4
>  the value of replica will be calculated as {{Math.ceil(4/3) = 1.33}}
> current state : nodes=3, replicationFactor=2
> this is equivalent to the hard coded rule
> {code:java}
> {"replica" : "<3" , "shard" : "#EACH" , "node" : "#ANY"}
> {code}
> *case 2* : 
> current state : nodes=3, replicationFactor=2
> this is equivalent to the hard coded rule
> {code:java}
> {"replica" : "<3" , "shard" : "#EACH" , "node" : "#ANY"}
> {code}
> *example:2*
> {code}
> {"replica" : "#EQUAL"  , "node" : "#ANY"}{code}
> *case 1*: numShards = 2, replicationFactor=3, nodes = 5
> this is equivalent to the hard coded rule
> {code:java}
> {"replica" : "1.2" , "node" : "#ANY"}
> {code}



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