chia7712 commented on code in PR #23310:
URL: https://github.com/apache/kafka/pull/23310#discussion_r4067653079


##########
metadata/src/main/java/org/apache/kafka/controller/ConfigurationControlManager.java:
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@@ -311,6 +312,7 @@ private ApiError incrementalAlterConfigResource(
                     break;
                 case DELETE:
                     newValue = null;
+                    explicitlyDeletedConfigs.add(key);

Review Comment:
   I don't think #23545 fully addresses the issue I mentioned. First, changing 
the public interface generally requires a KIP. Second, this seems to conflict 
with the compatibility goals introduced by KIP-1252.
   
   In my opinion, it might be safer to revert this PR and propose a KIP to 
properly accommodate the changes in #23543. @edoardocomar @arnabnandy7 WDYT?



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