isaacreath commented on code in PR #2863:
URL: https://github.com/apache/cassandra/pull/2863#discussion_r1382198574


##########
src/java/org/apache/cassandra/net/StartupClusterConnectivityChecker.java:
##########
@@ -82,6 +85,16 @@ public boolean execute(Set<InetAddressAndPort> peers, 
Function<InetAddressAndPor
         if (peers == null || this.timeoutNanos < 0)
             return true;
 
+        // Check if there are any nodes which we know are running a version 
prior to 4.0.
+        // We use this intead of Gossiper::hasMajorVersion3Nodes because in 
the absence of version information for a peer
+        // we still prefer to run the startup connectivity check.
+        if 
(gossiper.isUpgradingFromVersionLowerThan(CassandraVersion.CASSANDRA_4_0))

Review Comment:
   The only reason I added it to the constructor is to let me mock it out in 
the `StartupClusterConnectivityCheckerTest`. Happy to remove, but that would 
make testing the component a bit trickier. 



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