showuon commented on code in PR #15516:
URL: https://github.com/apache/kafka/pull/15516#discussion_r1607919763


##########
storage/src/main/java/org/apache/kafka/storage/internals/log/LogValidator.java:
##########
@@ -331,12 +332,12 @@ public ValidationResult 
assignOffsetsNonCompressed(LongRef offsetCounter,
     public ValidationResult validateMessagesAndAssignOffsetsCompressed(LongRef 
offsetCounter,
                                                                        
MetricsRecorder metricsRecorder,
                                                                        
BufferSupplier bufferSupplier) {
-        if (targetCompression == CompressionType.ZSTD && 
interBrokerProtocolVersion.isLessThan(IBP_2_1_IV0))
+        if (targetCompression.type() == CompressionType.ZSTD && 
interBrokerProtocolVersion.isLessThan(IBP_2_1_IV0))
             throw new UnsupportedCompressionTypeException("Produce requests to 
inter.broker.protocol.version < 2.1 broker " +
                 "are not allowed to use ZStandard compression");
 
         // No in place assignment situation 1
-        boolean inPlaceAssignment = sourceCompression == targetCompression;
+        boolean inPlaceAssignment = sourceCompressionType == 
targetCompression.type();

Review Comment:
   I agree. But I think we should mention this in the KIP-390 at least.



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