chia7712 commented on code in PR #20248:
URL: https://github.com/apache/kafka/pull/20248#discussion_r2245241241


##########
tools/src/main/java/org/apache/kafka/tools/FeatureCommand.java:
##########
@@ -315,11 +305,9 @@ private static void handleUpgradeOrDowngrade(String op, 
Namespace namespace, Adm
             if (metadata != null) {
                 System.out.println(" `metadata` flag is deprecated and may be 
removed in a future release.");
                 try {
-                    metadataVersion = 
MetadataVersion.fromVersionString(metadata);
+                    metadataVersion = 
MetadataVersion.fromVersionString(metadata, false);

Review Comment:
   Yes, it remains consistent with the original implementation. However, it 
also introduces a new restriction
   ```java
           } else if (!unstableFeatureVersionsEnabled && 
!metadataVersion.isProduction()) {
               throw new IllegalArgumentException(errorMsg);
   ```
   For example, users may download the trunk source code to test an upgrade 
with an older version of Kafka, and this new restriction could prevent them 
from upgrading to a non-production MV. Shouldn't it?



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