学习资料
github上中文文档，相当详细：
https://github.com/apache/rocketmq/tree/master/docs/cn
简单实例展示：
https://github.com/apache/rocketmq/tree/master/example
通过认真看完上面内容，及实验实例之后就可以详细的了解rocketmq的特性、原理及应用。
问题记录
org.apache.rocketmq.client.exception.MQClientException: Send [3] times, still failed, cost [41]ms, Topic: TopicTest, BrokersSent: [broker-a, broker-a, broker-a]
See http://rocketmq.apache.org/docs/faq/ for further details.
at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:638)
at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1310)
at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.send(DefaultMQProducerImpl.java:1256)
at org.apache.rocketmq.client.producer.DefaultMQProducer.send(DefaultMQProducer.java:339)
at org.apache.rocketmq.example.quickstart.Producer.main(Producer.java:69)
Caused by: org.apache.rocketmq.client.exception.MQBrokerException: CODE: 14 DESC: service not available now, maybe disk full, CL: 0.91 CQ: 0.91 INDEX: 0.91, maybe your broker machine memory too small.
For more information, please visit the url, http://rocketmq.apache.org/docs/faq/
at org.apache.rocketmq.client.impl.MQClientAPIImpl.processSendResponse(MQClientAPIImpl.java:671)
at org.apache.rocketmq.client.impl.MQClientAPIImpl.sendMessageSync(MQClientAPIImpl.java:467)
at org.apache.rocketmq.client.impl.MQClientAPIImpl.sendMessage(MQClientAPIImpl.java:449)
at org.apache.rocketmq.client.impl.MQClientAPIImpl.sendMessage(MQClientAPIImpl.java:403)
at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendKernelImpl(DefaultMQProducerImpl.java:831)
at org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl.sendDefaultImpl(DefaultMQProducerImpl.java:557)
... 4 more
未完待续…