thetumbled commented on code in PR #22452:
URL: https://github.com/apache/pulsar/pull/22452#discussion_r1554838333


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java:
##########
@@ -321,6 +323,8 @@ public void addComplete(Position position, ByteBuf 
entryData, Object ctx) {
                         }
                         txnCommittedCounter.increment();
                         completableFuture.complete(null);
+                        // need to update the last data message published 
timestamp
+                        
topic.setLastDataMessagePublishedTimestamp(Clock.systemUTC().millis());

Review Comment:
   LastDataMessagePublishedTimestamp is used to determined whether there are 
new messages available for reading. A transactional production should not 
update it as the uncommitted messages are not visible.



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