showuon commented on code in PR #15474:
URL: https://github.com/apache/kafka/pull/15474#discussion_r1519662867


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storage/src/main/java/org/apache/kafka/storage/internals/log/LogValidator.java:
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@@ -417,8 +422,14 @@ public ValidationResult 
validateMessagesAndAssignOffsetsCompressed(LongRef offse
             long lastOffset = offsetCounter.value - 1;
             firstBatch.setLastOffset(lastOffset);
 
-            if (timestampType == TimestampType.LOG_APPEND_TIME)
+            if (timestampType == TimestampType.LOG_APPEND_TIME) {
                 maxTimestamp = now;
+                if (toMagic >= RecordBatch.MAGIC_VALUE_V2) {
+                    offsetOfMaxTimestamp = lastOffset;

Review Comment:
   You're right, in the `create time` case, we'll scan through records 1 by 1, 
and only set the `offsetOfMaxTimestamp` when timestamp > previous one, so the 
semantic for MAX_TIMESTAMP is the _first offset_ with the max timestamp. Change 
it to initialOffset for `append time` case.



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