dajac commented on code in PR #16120:
URL: https://github.com/apache/kafka/pull/16120#discussion_r1621843638


##########
core/src/test/java/kafka/test/ClusterInstance.java:
##########
@@ -159,9 +158,7 @@ default Set<GroupProtocol> supportedGroupProtocols() {
         Set<GroupProtocol> supportedGroupProtocols = new HashSet<>();
         supportedGroupProtocols.add(CLASSIC);
 
-        // KafkaConfig#isNewGroupCoordinatorEnabled check both 
NEW_GROUP_COORDINATOR_ENABLE_CONFIG and 
GROUP_COORDINATOR_REBALANCE_PROTOCOLS_CONFIG
-        if (serverProperties.getOrDefault(NEW_GROUP_COORDINATOR_ENABLE_CONFIG, 
"").equals("true") ||

Review Comment:
   We will eventually remove it for sure. This (private) config is still the 
one use to determine whether the new group coordinator should be enabled or 
not. The trick to know is that it is automatically set to true when `consumer` 
is specified as a protocol. We made this to simplify the early access and the 
preview.
   
   The handling was a bit messy before this patch as the new protocol was 
enabled whenever the new coordinator ran. It is better now.



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