GitHub user cserwen added a comment to the discussion: broker 返回异常
[TIMEOUT_CLEAN_QUEUE]broker busy
这里是是服务端 Broker 因为 busy 而快速失败返回给客户端的,具体方法你可以看下
cleanExpiredRequestInQueue,如果队头任务等待时间超过了配置值(默认为200ms)就会 fast fail,以便客户端快速到其他节点重试
一般常见于发送队列,对于发送,最可能的就是 操作系统 pagecache 进行同步回收,阻塞了写入,然后导致写入队列堆积,可以看下服务端 store.log
中有没有以下日志来判断
```log
[NOTIFYME]putMessage in lock cost time(ms)={}, bodyLength={}
AppendMessageResult={}
```
GitHub link:
https://github.com/apache/rocketmq/discussions/8188#discussioncomment-9545368
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