humkum commented on issue #9056:
URL: https://github.com/apache/rocketmq/issues/9056#issuecomment-2545071080
[TIMEOUT_CLEAN_QUEUE]broker busy, start flow control for a while, period in
queue: 200ms, size of queue: 9 这个错误是服务端处理达到瓶颈限流了。调整 sendMessageThreadPoolNums
没有意义，在实际存储消息的地方，因为是单文件，数据写入之前会加锁处理。如果只是偶尔有这个报错，可以适当调整 waitTimeMillsInSendQueue
这个参数(默认 200ms，比如可以调整为 500ms)，可以让请求在队列中多保留一会，来减少这个报错。
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