dajac commented on code in PR #16945:
URL: https://github.com/apache/kafka/pull/16945#discussion_r1726565209


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinator.java:
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@@ -63,6 +63,11 @@
  */
 public interface GroupCoordinator {
 
+    /**
+     * @return True if the new coordinator; False otherwise.
+     */
+    boolean isNewGroupCoordinator();

Review Comment:
   I introduced this new method to the GroupCoordinator interface and I use it 
at runtime (e.g. in KafkaApi) to determine whether the new or the old 
coordinator is used. I did not in order to not rely on the 
`group.coordinator.new.enable` configuration at runtime. The issue was that in 
ZK mode, the `group.coordinator.new.enable` is also true by default now but the 
configuration is just ignored when the zk broker starts.



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