maixiaohai commented on issue #2709:
URL: https://github.com/apache/rocketmq/issues/2709#issuecomment-790302213
config sendThreadPoolQueueCapacity, the default value is 10000
the message show your config is 4
```
rt.returnResponse(RemotingSysResponseCode.SYSTEM_BUSY,
String.format("[PCBUSY_CLEAN_QUEUE]broker busy, start flow control for a while,
period in queue: %sms, size of queue: %d", System.currentTimeMillis() -
rt.getCreateTimestamp(),
this.brokerController.getSendThreadPoolQueue().size()));
```
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