dajac commented on code in PR #16347:
URL: https://github.com/apache/kafka/pull/16347#discussion_r1642442783


##########
server-common/src/main/java/org/apache/kafka/server/common/MetadataVersion.java:
##########
@@ -202,11 +202,12 @@ public enum MetadataVersion {
     // Add new fetch request version for KIP-951
     IBP_3_7_IV4(19, "3.7", "IV4", false),
 
-    // Add ELR related supports (KIP-966).
-    IBP_3_8_IV0(20, "3.8", "IV0", true),
+    // New version for the Kafka 3.8.0 release.
+    IBP_3_8_IV0(20, "3.8", "IV0", false),
 
+    // Add ELR related supports (KIP-966).

Review Comment:
   I wonder if we should put a comment here explaining that the MV below this 
point are not production ready. We could also add a few words explaining that 
features must be reviewed and they must moved to the next one if they are not 
ready when the next MV is made production ready.



##########
server-common/src/main/java/org/apache/kafka/server/common/GroupVersion.java:
##########
@@ -22,7 +22,7 @@
 public enum GroupVersion implements FeatureVersion {
 
     // Version 1 enables the consumer rebalance protocol (KIP-848).
-    GV_1(1, MetadataVersion.IBP_4_0_IV0, Collections.emptyMap());
+    GV_1(1, MetadataVersion.IBP_3_9_IV0, Collections.emptyMap());

Review Comment:
   Should we keep it attached to `IBP_4_0_IV0` as we already know that it will 
be release in 4.0? If not, we should file a blocker for 3.9 to ensure that we 
change it before we release 3.9.



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