wz2cool commented on issue #2709:
URL: https://github.com/apache/rocketmq/issues/2709#issuecomment-790701669
> 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()));
> ```
thank you for your quick response. Actually, we don't change this property
in config and it show 4 queues not queue capacity. Will try to set
useReentrantLockWhenPutMessage to true to avoid this issue.
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