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https://issues.apache.org/jira/browse/SOLR-15055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17262624#comment-17262624
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Andrzej Bialecki commented on SOLR-15055:
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The requirement #1 from the list above can be implemented just in the placement
plugin (filter candidate nodes to ensure that they contain at least one
secondary replica). However, other requirements need modifications to
{{DeleteReplicaCmd .}}
> Re-implement 'withCollection' and 'maxShardsPerNode'
> ----------------------------------------------------
>
> Key: SOLR-15055
> URL: https://issues.apache.org/jira/browse/SOLR-15055
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> Solr 8x replica placement provided two settings that are very useful in
> certain scenarios:
> * {{withCollection}} constraint specified that replicas should be placed on
> the same nodes where replicas of another collection are located. In the 8x
> implementation this was limited in practice to co-locating single-shard
> secondary collections used for joins or other lookups from the main
> collection (which could be multi-sharded).
> * {{maxShardsPerNode}} - this constraint specified the maximum number of
> replicas per shard that can be placed on the same node. In most scenarios
> this was set to 1 in order to ensure fault-tolerance (ie. at most 1 replica
> of any given shard would be placed on any given node). Changing this
> constraint to values > 1 would reduce fault-tolerance but may be desired in
> test setups or as a temporary relief measure.
>
> Both these constraints are collection-specific so they should be configured
> e.g. as collection properties.
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