dsmiley commented on PR #3431:
URL: https://github.com/apache/solr/pull/3431#issuecomment-3305380157

   In #3643 , I attempted to use the version from live nodes to decide to use 
the overseer or not.  @HoustonPutman , you pointed out that the last upgrading 
node in a rolling upgrade wouldn't realize that the cluster was considered to 
be a lower version previously, and thus would not use the overseer when the 
rest of the cluster is still using the overseer.  Solving it is possible but 
seems awkward to me.  It's debatable.
   
   I think this approach here wouldn't have that problem, and it's simpler to 
reason about.  It's safer.
   
   Again, read the short JIRA for the greater context.


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