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https://issues.apache.org/jira/browse/SOLR-12495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16532834#comment-16532834
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ASF subversion and git services commented on SOLR-12495:
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Commit f86c477521637a5cd48808c9f6b3d86b6db92b42 in lucene-solr's branch
refs/heads/master from [~noble.paul]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=f86c477 ]
SOLR-12495: An #EQUALS function for replica in autoscaling policy to equally
distribute replicas
> 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" : "<3" , "node" : "#ANY"}
> {code}
> *example:3*
> {code}
> {"replica" : "<2" , "shard" : "#EACH" , "port" : "8983"}{code}
> *case 1*: {{replicationFactor=3, nodes with port 8983 = 2}}
> this is equivalent to the hard coded rule
> {code}
> {"replica" : "<3" , "shard" : "#EACH" , "port" : "8983"}{code}
> *example : 3: distribute among other properties*
> {code}
> {"replica" : "#EQUAL" , "sysprop.zone" : "#EACH"}
> {code}
> *case 1*: numShards = 3, replicationFactor=1, zones are : {{east}}, {{west}}
> (total = 2)
> this means each zone must have equal replicas . {{total replicas = 3 * 1 =
> 3}}, {{total zones = 2}} , {{replicas per zone = 3/2 = 1.5}}
> The above case
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