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https://issues.apache.org/jira/browse/SOLR-13891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cassandra Targett resolved SOLR-13891.
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Resolution: Won't Fix
I believe this can be resolved as Solr 9 has replaced and re-considered the
entire replica placement strategy and framework.
By default (currently in {{main}}), new replicas will be placed on nodes which
have the fewest replicas of the collection's shards first. The documentation
explains how this works, and describes the options for configuring this
behavior in different ways:
https://nightlies.apache.org/solr/draft-guides/solr-reference-guide-main/replica-placement-plugins.html.
Note there is discussion to change this default for 9.0 happening in SOLR-15209.
> Default replica placement is random
> -----------------------------------
>
> Key: SOLR-13891
> URL: https://issues.apache.org/jira/browse/SOLR-13891
> Project: Solr
> Issue Type: Bug
> Reporter: Yonik Seeley
> Priority: Major
>
> By default, our current replica placement is effectively random instead of
> spreading preferring nodes with fewer cores.
> Within a single collection create, replicas are spread across nodes, but
> without regard to the current core count on those nodes.
> This represents a regression from past behavior.
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