dao-jun commented on code in PR #22452:
URL: https://github.com/apache/pulsar/pull/22452#discussion_r1554843436


##########
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:
   Actually, I think update `LastDataMessagePublishedTimestamp` before or after 
the txn committed doesn't matter.
   Because if there is a non-txn message published to the topic before some txn 
committed will also update it.
   



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