David Smiley created SOLR-17879:
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Summary: A SolrCloud node should fail to start if it's major
version is smaller than the cluster
Key: SOLR-17879
URL: https://issues.apache.org/jira/browse/SOLR-17879
Project: Solr
Issue Type: Improvement
Components: SolrCloud
Reporter: David Smiley
If there's a "Solr 10 cluster" (meaning, a cluster in which all live_nodes
express Solr 10 via SOLR-17620), and the current node that which is about to
join the cluster is Solr 9, then the current node should fail to start. This
should be enforced for a difference in major versions. This is not an
enforcement of the inverse -- a Solr 10 node +may+ joint a Solr 9 cluster, and
thus a rolling upgrade is not prevented.
Solr versions >= 9.10 can enforce this but already released Solr versions (like
9.9) will not be able to do so.
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