dugenkui03 opened a new issue #4103:
URL: https://github.com/apache/rocketmq/issues/4103
Replace the implementions of `Message#setKeys` with `String.join`, and we
can simply optimized the join operation(cpu or gc) depending on jvm/jdk.
```java
public void setKeys(Collection<String> keys) {
StringBuilder sb = new StringBuilder();
for (String k : keys) {
sb.append(k);
sb.append(MessageConst.KEY_SEPARATOR);
}
this.setKeys(sb.toString().trim());
}
```
```java
this.setKeys(String.join(MessageConst.KEY_SEPARATOR, keys));
```
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