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https://issues.apache.org/jira/browse/SOLR-17879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-17879.
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Fix Version/s: 9.10
Assignee: David Smiley
Resolution: Fixed
> 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
> Assignee: David Smiley
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.10
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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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