zhongxiongzeng opened a new issue #3539:
URL: https://github.com/apache/rocketmq/issues/3539


   For high-frequency and small-scale timing tasks, it is better to use netty's 
hashedWheelTimer. The implementation principle can be seen as follows: 
http://www.cs.columbia.edu/~nahum/w6998/papers/ton97-timing-wheels.pdf ,Using 
hashedWheelTimer can better reduce the occupation of resources, and it has now 
been used in netty, dubbo, kafka and other middleware;


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