java Kcp

java-Kcp

README in english

kcp implemented based on netty version (including implementation of fec function)

KCP is a fast and reliable protocol (rudp) based on UDP. It can reduce the average delay by 30%-40% and reduce the maximum delay by three times at the cost of wasting 10%-20% of bandwidth than TCP.

maven address:

< dependency >
  < groupId >com.github.l42111996</ groupId >
  < artifactId >kcp-base</ artifactId >
  < version >1.6</ version >
</ dependency >

Usage methods and parameters

1. Server side example
2. Client instance
3. best practices
4. A lot of information
5. Compatible with c#, java server, c# client
6. Problems encountered
7. Performance test results
8. Compatible with kcp-go, including fec compatibility

compatibility:

1. Compatible with c version kcp
2. fec is implemented based on https://github.com/Backblaze/JavaReedSolomon
3. Perfectly compatible C# version, https://github.com/l42111996/csharp-kcp, to quickly build game front-end and back-end network libraries

stability:

It is already a stable version. According to statistics, 5 to 10 online projects have been accessed, including products from Tencent, Kuaishou and other companies.

optimization:

1. Event-driven, taking full advantage of multi-core
2. Optimize fastack logic and reduce traffic by 10%
3. Optimize the check function.
4. Optimize collection iterators.
5. Contains fec to reduce latency
6. Comes with crc32 check
7. Use the time wheel to optimize the CPU usage of a large number of connections
8. Use directbuf and object pool, no gc pressure
9. Added use of conv or ip+port to determine channel uniqueness. The game recommends using conv and tcp configuration. Related information
10. When increasing game usage, 4G switching to wifi and other export IP changes will not cause the connection to be disconnected.

Related information

1. https://github.com/skywind3000/kcp Original c version of kcp
2. https://github.com/xtaci/kcp-go go version kcp, with a lot of optimizations
3. https://github.com/Backblaze/JavaReedSolomon java versionfec
4. https://github.com/LMAX-Exchange/disruptor High-performance inter-thread messaging library
5. https://github.com/JCTools/JCTools High-performance concurrency library
6. https://github.com/szhnet/kcp-netty java version of a kcp
7. https://github.com/l42111996/csharp-kcp C# version kcp based on dotNetty, perfectly compatible

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