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https://issues.apache.org/jira/browse/SOLR-17879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018519#comment-18018519
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ASF subversion and git services commented on SOLR-17879:
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Commit bd767e3f744e540530abd86cba8f4a6a8a17035c in solr's branch
refs/heads/main from David Smiley
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=bd767e3f744 ]
SOLR-17879: Fail to start if its major version is smaller than the cluster
(#3510)
A Solr node will now fail to start if its major.minor version (e.g. 9.10) is
*lower* than that of any existing
Solr node in a SolrCloud cluster (as reported by info in "live_node").
> 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
> Priority: Major
> Labels: pull-request-available
> 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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