FrankYang0529 commented on code in PR #20370:
URL: https://github.com/apache/kafka/pull/20370#discussion_r2298216660


##########
core/src/main/scala/kafka/coordinator/transaction/TransactionLog.scala:
##########
@@ -115,28 +115,25 @@ object TransactionLog {
       val version = buffer.getShort
       if (version >= TransactionLogValue.LOWEST_SUPPORTED_VERSION && version 
<= TransactionLogValue.HIGHEST_SUPPORTED_VERSION) {
         val value = new TransactionLogValue(new ByteBufferAccessor(buffer), 
version)
-        val transactionMetadata = new TransactionMetadata(
+        val state = TransactionState.fromId(value.transactionStatus)
+        val tps: util.Set[TopicPartition] = new util.HashSet[TopicPartition]()
+        if (!state.equals(TransactionState.EMPTY))
+          value.transactionPartitions.forEach(partitionsSchema => {
+            partitionsSchema.partitionIds.forEach(partitionId => tps.add(new 
TopicPartition(partitionsSchema.topic, partitionId.intValue())))
+          })
+        Some(new TransactionMetadata(
           transactionalId,
           value.producerId,
           value.previousProducerId,
           value.nextProducerId,
           value.producerEpoch,
           RecordBatch.NO_PRODUCER_EPOCH,
           value.transactionTimeoutMs,
-          TransactionState.fromId(value.transactionStatus),
-          util.Set.of(),
+          state,
+          tps,
           value.transactionStartTimestampMs,
           value.transactionLastUpdateTimestampMs,
-          TransactionVersion.fromFeatureLevel(value.clientTransactionVersion))
-
-        if (!transactionMetadata.state.equals(TransactionState.EMPTY))
-          value.transactionPartitions.forEach(partitionsSchema => {
-            transactionMetadata.addPartitions(partitionsSchema.partitionIds

Review Comment:
   Sorry for the late reply. I add `// VisibleForTesting` for functions which 
are only used in testing code. Thanks.



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