chia7712 commented on code in PR #20466:
URL: https://github.com/apache/kafka/pull/20466#discussion_r2385458576


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorConfig.java:
##########
@@ -298,7 +299,8 @@ public class GroupCoordinatorConfig {
     public static final ConfigDef CONFIG_DEF = new ConfigDef()
         // Group coordinator configs
         .define(GROUP_COORDINATOR_REBALANCE_PROTOCOLS_CONFIG, LIST, 
GROUP_COORDINATOR_REBALANCE_PROTOCOLS_DEFAULT,
-                ConfigDef.ValidList.in(false, 
Group.GroupType.documentValidValues()), MEDIUM, 
GROUP_COORDINATOR_REBALANCE_PROTOCOLS_DOC)
+                
ConfigDef.ValidList.in(GROUP_COORDINATOR_REBALANCE_PROTOCOLS_ALLOWED.toArray(new
 String[0])), 

Review Comment:
   > I do understand your point but I was not expecting other group types to 
use this config after KIP-848. It would be acceptable to me for share groups to 
honour this config in trunk and AK 4.2. Let me know what you think.
   
   In fact, I’d prefer to raise a KIP to deprecate 
group.coordinator.rebalance.protocols in trunk and AK 4.2. Let’s leave it as 
is, since extending a deprecated config would be a bit odd. I’ve opened 
KAFKA-19740 for this.
   



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