rreddy-22 commented on code in PR #19539:
URL: https://github.com/apache/kafka/pull/19539#discussion_r2078915492
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clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java:
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@@ -978,6 +1022,14 @@ private Future<RecordMetadata> doSend(ProducerRecord<K,
V> record, Callback call
try {
throwIfProducerClosed();
+
+ // Check if we're in a prepared transaction state, in which case
send is not allowed
Review Comment:
I originally didn't add the check to the beginTransaction method since we
expect the IllegalStateException when the state transition from PREPARED to
IN_TRANSACTION is attempted. But I can add a preemptive error like the send
method for begin txn as well
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