[jira] [Resolved] (SOLR-12592) Support cores:'EQUAL' %age , range in autoscaling policies

["Noble Paul (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-12592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Noble Paul resolved SOLR-12592.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 7.5
                   master (8.0)

> Support cores:'EQUAL'  %age , range in autoscaling policies
> -----------------------------------------------------------
>
>                 Key: SOLR-12592
>                 URL: https://issues.apache.org/jira/browse/SOLR-12592
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling, SolrCloud
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>            Priority: Major
>             Fix For: master (8.0), 7.5
>
>
> It's possible to  sort nodes according to cores and the system can normally prefer nodes with fewer cores when placing new replicas. However, it may not give suggestions to move off replicas , if the system  is already in an unbalanced state.
> The following rule may help achieve such a balanced distribution of cores
> {code}
> {"cores":"#EQUAL" , node: "#ANY"}
> {code}
> The value of cores is computed as {{total_cores/total_nodes}}. for e.g: if there are 28 cores in total and there are 5 nodes . the value of cores= 28/5 = 5.6. This means a node may have either 5 cores or 6 cores.
> It's possible that this may cause a conflict with other collection-specific rules such as
> {code}
> {"replica":"#EQUAL" , "node" : "#ANY"}
> {code}
> It can be remedied by making this rule , not strict.
> {code}
> {"cores":"#EQUAL" , "node": "#ANY", "strict"=false}
> {code}



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