tolbertam commented on code in PR #4699:
URL: https://github.com/apache/cassandra/pull/4699#discussion_r3068427566


##########
conf/cassandra.yaml:
##########
@@ -2682,6 +2682,20 @@ max_security_label_length: 48
 # compressed by dictionary compressor and training_min_frequency is set to 0m 
(the default when unset).
 #unset_training_min_frequency_enabled: true
 
+# Minimum client driver versions. Connections from drivers whose version is 
below
+# the configured minimum will be warned or rejected. Connections that do not 
report
+# a driver name or version are considered valid. The map key is the driver name
+# as reported in the native protocol STARTUP message. The value is the minimum
+# version string.
+#minimum_client_driver_versions_warned:
+#  DataStax Java Driver: "4.0.0"

Review Comment:
   It is surprising to me that one can use spaces in YAML keys, interesting!   
Part of me wants to advocate for some kind of convention, e.g. lower case 
everything and separate spaces by `_`, but then that may create some ambiguity.
   
   Overall, I think this approach will work fine.   We probably would not want 
to accept spaces in yaml keys in the regular config, but since these properties 
are driven by values that come from elsewhere (the drivers themselves), this 
seems fine.



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