Netty features and thread model

Zero copy hard driver - kernel buffer - protocol engine only DMA copy avoids cpu copy
There was actually a cpu copy of kernel buffer - socket buffer, but the copied information can rarely be ignored;

Traditional blocking IO model
Each connection requires an independent thread to complete data input, business processing, and data return;
Disadvantages: When the concurrency is large, a large number of threads will be created, increasing the pressure on the server;

reactor mode
1. Based on the IO reuse model, multiple connections share a blocking object
2. Reuse thread resources based on the thread pool, one thread can handle the business of multiple connections

Core component reactor handler
According to the number of reactors and the number of processing threads, there are three implementations:
1. Single reactor single thread
2. Single reactor and multi-threaded high concurrency, there will be performance bottlenecks

3. Master-slave reactor multithreading The reactor main thread can correspond to multiple reactor sub-threads

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