liangyepianzhou commented on code in PR #20948:
URL: https://github.com/apache/pulsar/pull/20948#discussion_r1289984073


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ProducerImpl.java:
##########
@@ -553,9 +555,8 @@ public void sendAsync(Message<?> message, SendCallback 
callback) {
                 synchronized (this) {
                     // Update the message metadata before computing the 
payload chunk size
                     // to avoid a large message cannot be split into chunks.
-                    final long sequenceId = 
updateMessageMetadataSequenceId(msgMetadata);
-                    String uuid = totalChunks > 1 ? String.format("%s-%d", 
producerName, sequenceId) : null;
-
+                    final long sequenceId = 
updateMessageMetadataSequenceId(msgMetadata, chunkId > 0);
+                    String uuid = totalChunks > 1 ? String.format("%s-%s", 
producerName,  sequenceId - chunkId) : null;

Review Comment:
   The sequence ID will increase with the chunk ID. So they have the same uuid 
for all chunks per message.



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