[jira] [Commented] (SOLR-12739) Make autoscaling policy based replica placement the default strategy for placing replicas

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-12739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16636848#comment-16636848 ] 

Shalin Shekhar Mangar commented on SOLR-12739:
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Now that SOLR-12756 has been committed, all we need to do is to modify the {{AssignStrategyFactory}} to choose autoscaling as default. But before we can do that, we need to provide a way for users to switch to the old behavior if they need to. So I propose that we add a boolean cluster property {{defaults/cluster/useLegacyReplicaAssignment}} which can be set to true to force the legacy assignment strategy. By default, this will be false so we can use the autoscaling framework.

> Make autoscaling policy based replica placement the default strategy for placing replicas
> -----------------------------------------------------------------------------------------
>
>                 Key: SOLR-12739
>                 URL: https://issues.apache.org/jira/browse/SOLR-12739
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling, SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Priority: Major
>             Fix For: 7.6, master (8.0)
>
>
> Today the default placement strategy is the same one used since Solr 4.x which is to select nodes on a round robin fashion. I propose to make the autoscaling policy based replica placement as the default policy for placing replicas.
> This is related to SOLR-12648 where even though we have default cluster preferences, we don't use them unless a policy is also configured.



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