codinl edited a comment on issue #569:
URL:
https://github.com/apache/rocketmq-client-go/issues/569#issuecomment-744338458
加了这行后，好了。
```
producer.WithNamespace("实例 ID"),
```
不能理解这个操作。。。。。😳
难道不应该是：WithInstanceId("xxxxx") ????????????????????
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