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