junrao commented on code in PR #19250:
URL: https://github.com/apache/kafka/pull/19250#discussion_r2006572003


##########
clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java:
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@@ -234,9 +229,10 @@
  * successful writes are marked as aborted, hence keeping the transactional 
guarantees.
  * </p>
  * <p>
- * This client can communicate with brokers that are version 0.10.0 or newer. 
Older or newer brokers may not support
- * certain client features.  For instance, the transactional APIs need broker 
versions 0.11.0 or later. You will receive an
- * <code>UnsupportedVersionException</code> when invoking an API that is not 
available in the running broker version.
+ * This client can communicate with brokers that are version 2.1 or newer. 
Older brokers may not support

Review Comment:
   For producers, transaction.version needs to be set on the newer server to 
enable txn V2 support.
   
   For consumers, group.version needs to be set to enable the new consumer 
rebalance protocol.



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