codelipenghui commented on PR #15413:
URL: https://github.com/apache/pulsar/pull/15413#issuecomment-1119560827
```java
messagesToSend.add(producer.newMessage().value("msg-0").key("A").sequenceId(0));
messagesToSend.add(producer.newMessage().value("msg-1").key("B").sequenceId(1));
messagesToSend.add(producer.newMessage().value("msg-2").key("B").sequenceId(2));
messagesToSend.add(producer.newMessage().value("msg-3").key("A").sequenceId(3));
```
What is the expected behavior for the above case?
The deduplication depends on the monotonically increasing sequence ID, but
the key-based
batcher will break the rule.
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