liangyepianzhou commented on code in PR #20948:
URL: https://github.com/apache/pulsar/pull/20948#discussion_r1289398905
##########
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, chunkUUid) : null;
Review Comment:
Yeah, we need to worry about the uuid collision.
So we should sequence ID to generate uuid.
```
String uuid = totalChunks > 1 ? String.format("%s-%s", producerName,
sequenceId - chunkId) : null;
```
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