CalvinConfluent commented on code in PR #17952:
URL: https://github.com/apache/kafka/pull/17952#discussion_r1887340069


##########
metadata/src/main/java/org/apache/kafka/controller/ConfigurationControlManager.java:
##########
@@ -497,10 +541,63 @@ public Map<ConfigResource, ResultOrError<Map<String, 
String>>> describeConfigs(
         return results;
     }
 
+    // The function is used when enabling ELR. It will create a new cluster 
level min ISR config if there is not any.
+    // Also, it will remove all the broker level min ISR config records.
+    void maybeResetMinIsrConfig(List<ApiMessageAndVersion> outputRecords) {
+        if (!clusterConfig().containsKey(MIN_IN_SYNC_REPLICAS_CONFIG)) {
+            String minIsrDefaultConfigValue = 
configSchema.getStaticOrDefaultConfig(

Review Comment:
   Sounds good, updated.



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