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Posted to dev@lucene.apache.org by "Noble Paul (JIRA)" <ji...@apache.org> on 2018/07/04 03:17:00 UTC
[jira] [Assigned] (SOLR-12495) Enhance the Autoscaling policy
syntax to evenly distribute replicas among nodes
[ https://issues.apache.org/jira/browse/SOLR-12495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Noble Paul reassigned SOLR-12495:
---------------------------------
Assignee: Noble Paul
> 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:java}
> {"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 distribute among multiple unique properties*
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