RocketMQ [TIMEOUT_CLEAN_QUEUE]broker busy问题分析_broker busy, start flow control for a while, perio-优快云博客

本文链接：https://blog.youkuaiyun.com/u010152179/article/details/91797149

本文分析了RocketMQ在运行中出现[TIMEOUT_CLEAN_QUEUE]broker busy错误的原因，问题源于Broker快速失败机制中等待队列头元素超时。主要讨论了发送Topic消息时触发此错误的场景，并提供了解决方案，包括业务异常捕获、重发消息策略以及调整broker的发送消息任务队列等待时长。同时，建议检查磁盘IO情况，高IO可能导致消息落盘延迟，也是引发此问题的因素之一。

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问题描述

最近线上总是出现TIMEOUT_CLEAN_QUEUE broker busy 的错误，所以跟踪源码分析下问题原因，错误详情如下:

com.alibaba.rocketmq.client.exception.MQBrokerException: CODE: 2  DESC: [TIMEOUT_CLEAN_QUEUE]broker busy, start flow control for a while, period in queue: 208ms, size of queue: 8
For more information, please visit the url, http://docs.aliyun.com/cn#/pub/ons/faq/exceptions&unexpected_exception
	at com.alibaba.rocketmq.client.impl.MQClientAPIImpl.processSendResponse(MQClientAPIImpl.java:455)
	at com.alibaba.rocketmq.client.impl.MQClientAPIImpl.sendMessageSync(MQClientAPIImpl.java:272)
	at com.alibaba.rocketmq.client.impl.MQClientAPIImpl.sendMessage(MQClientAPIImpl.java:253)
	at com.alibaba.rocketmq.client.impl.MQClientAPIImpl.sendMessage(MQClientAPIImpl.java:215)
	at com.alibaba.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendKernelImpl(DefaultMQProducerImpl.java:671)
	at com.alibaba.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:440)
	at com.alibaba.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1030)
	at com.alibaba.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:989)
	at com.alibaba.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:90)
	at 
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)

报错定位

报出此错误的源码位置为broker快速失败机制BrokerFastFailure.java类(该类在Broker启动时会启动一个定时任务，每10毫秒执行一次)，报错位置代码如下：

void cleanExpiredRequestInQueue(final BlockingQueue<Run