chia7712 commented on code in PR #20456:
URL: https://github.com/apache/kafka/pull/20456#discussion_r2649653963
##########
core/src/main/scala/kafka/coordinator/transaction/TransactionStateManager.scala:
##########
@@ -495,19 +495,21 @@ class TransactionStateManager(brokerId: Int,
memRecords.batches.forEach { batch =>
for (record <- batch.asScala) {
require(record.hasKey, "Transaction state log's key should not
be null")
- try {
- val transactionalId =
TransactionLog.readTxnRecordKey(record.key).asInstanceOf[String]
+ val transactionalId = try
Some(TransactionLog.readTxnRecordKey(record.key))
+ catch {
+ case e: IllegalStateException =>
+ warn(s"Unknown message key version while loading
transaction state from $topicPartition. " +
+ s"Ignoring it. It could be a left over from an aborted
upgrade. Error: ${e.getMessage}")
Review Comment:
```scala
warn(s"Unknown message key version while loading
transaction state from $topicPartition. " +
s"Ignoring it. It could be a left over from an aborted
upgrade", e)
```
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