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https://issues.apache.org/jira/browse/SOLR-9251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724268#comment-15724268
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Noble Paul commented on SOLR-9251:
----------------------------------

the rule {{rule=shard:RT,role:overseer}}  just does not look right. It means 
all replicas  of shard {{RT}} must live in the node which is designated as 
overseer. why would you want all replicas of a given shard live in one node? it 
must be conflicting with {{maxShardsperNode}} ?

Anyway, share your full create command

> Allow a tag role:!overseer in replica placement rules
> -----------------------------------------------------
>
>                 Key: SOLR-9251
>                 URL: https://issues.apache.org/jira/browse/SOLR-9251
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>             Fix For: 6.2
>
>         Attachments: SOLR-9251.patch
>
>
> The reason to assign an overseer role to  a node is to ensure that the node 
> is exclusively used as overseer. replica placement should support tag called 
> {{role}}
> So if a collection is created with {{rule=role:!overseer}} no replica should 
> be created in nodes designated as overseer



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