brandboat commented on code in PR #16592:
URL: https://github.com/apache/kafka/pull/16592#discussion_r1678099454


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storage/src/main/java/org/apache/kafka/storage/internals/log/ProducerStateManager.java:
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@@ -74,37 +71,10 @@ public class ProducerStateManager {
 
     public static final long LATE_TRANSACTION_BUFFER_MS = 5 * 60 * 1000;
 
-    private static final short PRODUCER_SNAPSHOT_VERSION = 1;

Review Comment:
   > @brandboat could you add a temporary unit test to verify the 
compatibility? We can move those struct stuff to testing and then generate some 
random data for comparison.
   
   Thanks, indeed there should have a compatibility test. One thing need to be 
mentioned is the unit test for ProducerStateManager is in scala, so I have to 
convert all old implementation in java code to scala code.



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