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https://issues.apache.org/jira/browse/SOLR-15715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851243#comment-17851243
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David Smiley commented on SOLR-15715:
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Gus, without this feature, how does one get a core/replica onto a coordinator
node that has no data? Normally a core is part of a shard and that shard has
data like all the others. This only partially addresses your questions; I
don't have all the answers. I think I would have rather seen a special shard;
maybe having no range and/or having a special state. But I think an aspect of
the solution here is to have an approach that scales to many collections, thus
don't want many empty cores. So instead I could imagine a collection that is
able to query any other collection.
I noticed an interesting new issue & PR on this feature recently SOLR-17118.
> Dedicated query coordinator nodes in the solr cluster
> -----------------------------------------------------
>
> Key: SOLR-15715
> URL: https://issues.apache.org/jira/browse/SOLR-15715
> Project: Solr
> Issue Type: New Feature
> Components: SearchComponents - other
> Affects Versions: 8.10.1
> Reporter: Hitesh Khamesra
> Assignee: Noble Paul
> Priority: Major
> Fix For: 9.1
>
> Attachments: coordinator-poc.jpg, coordinator-poc.pdf,
> coordinator-vs-data-nodes.jpg, regular-node.jpg, regular-node.pdf
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> We have a large collection with 1000s of shards in the solr cluster. We have
> observed that distributed solr query takes many resources(thread, memory,
> etc.) on the solr data node(node which contains indexes). Thus we need
> dedicated query nodes to execute distributed queries on large solr
> collection. That would reduce the memory/cpu pressure from solr data nodes.
> Elastis search has similar functionality
> [here|https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html#coordinating-node]
>
> [~noble.paul] [~ichattopadhyaya]
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