[Bug] Incorrect last sequence id when sending messages in batch

[BewareMyPower]

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• I searched in the issues and found nothing similar.

Version

d040039

Minimal reproduce step

    for (int i = 0; i < 3; i++) {
        Message msg = MessageBuilder().setContent("content").build();
        producer.sendAsync(msg, nullptr);
    }
    producer.flush();
    LOG_INFO("sequence id: " << producer.getLastSequenceId())

What did you expect to see?

The output should be sequence id: 2 because the 3 messages' sequence ids are [0, 1, 2].

What did you see instead?

However, the result is sequence id: 4, if changing i < 3 to i < 5, the result becomes sequence id: 8, which means the sequence id is increased twice for each message in the batch.

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!