yejiahao opened a new issue #2082:
URL: https://github.com/apache/rocketmq/issues/2082
I have seen the source code
**NamespaceUtil#wrapNamespace**
```java
public static String wrapNamespace(String namespace, String
resourceWithOutNamespace) {
// ...
StringBuffer strBuffer = new StringBuffer();
if (isRetryTopic(resourceWithOutNamespace)) {
strBuffer.append(MixAll.RETRY_GROUP_TOPIC_PREFIX);
}
if (isDLQTopic(resourceWithOutNamespace)) {
strBuffer.append(MixAll.DLQ_GROUP_TOPIC_PREFIX);
}
return
strBuffer.append(namespace).append(NAMESPACE_SEPARATOR).append(resourceWithoutRetryAndDLQ).toString();
}
```
Maybe use ```StringBuilder``` is better because I think it is local variable
level and obj doesn't "escape" from this method.
Feel free to reply for studying, thanks.
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