Netty:高性能NIO网络编程框架与实战应用

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NIO网络编程框架Netty是由Reythor雷主讲的一门课程,它是一个异步事件驱动的网络应用程序框架,特别适用于快速开发高性能的服务器和客户端应用。Netty采用NIO(非阻塞I/O)模型,旨在简化网络编程任务,如TCP和UDP套接字服务器的开发,同时保持良好的可维护性、性能、稳定性和灵活性。 Netty的核心优势在于其设计理念,即使于开发者使用,但不会牺牲应用程序的质量。它的设计经过了精心优化,包括对多种协议(如FTP、SMTP、HTTP等)的支持,以及对遗留的二进制和文本协议的兼容。这使得Netty成为了许多大型开源项目的选择,如Dubbo、Zookeeper、RocketMQ、Elasticsearch、Spring5(HTTP协议实现)、gRPC和Spark等底层通信框架的首选。 课程内容中,主要涉及以下几个关键概念: 1. **Channel** - Channel是Netty的核心概念,它是Socket的封装,提供了一组API来简化与Socket交互的操作。它充当了数据传输的通道,负责接收和发送数据,每个Channel与一个特定的EventLoop绑定,这个EventLoop负责处理该Channel的所有IO操作。 2. **EventLoopGroup** - EventLoopGroup是一个EventLoop的集合,Netty通过它来组织和管理多个并发的EventLoop。每个EventLoop对应一个单独的线程,负责处理单个Channel的IO事件。这种设计允许多个Channel共享事件处理,提高了效率。 3. **ServerBootstrap** - 作为Netty配置的核心组件,ServerBootstrap用于初始化和配置服务器端的架构,它将各种组件(如Channel、Codec等)关联在一起,形成完整的网络服务流程。 学习这门课程,开发者可以掌握如何利用Netty高效地构建网络服务,理解其内部机制,以及如何在实际项目中灵活运用这些核心概念。对于希望在高性能网络编程领域有所建树的开发人员来说,Netty是一个不可或缺的工具。
2023-06-12 上传

2023-07-14 15:19:01.215 WARN 7308 --- [sson-netty-2-15] io.netty.util.concurrent.DefaultPromise : An exception was thrown by org.redisson.misc.RedissonPromise$$Lambda$888/0x00000008008f7440.operationComplete() java.lang.NullPointerException: null 2023-07-14 15:19:01.216 ERROR 7308 --- [sson-netty-2-15] o.r.c.SentinelConnectionManager : Can't execute SENTINEL commands on /172.24.107.11:26379 org.redisson.client.RedisException: ERR No such master with that name. channel: [id: 0x2d66827d, L:/172.23.9.103:46812 - R:/172.24.107.11:26379] command: (SENTINEL SLAVES), params: [mymaster] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:365) ~[redisson-3.13.3.jar:3.13.3] at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:196) ~[redisson-3.13.3.jar:3.13.3] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:134) ~[redisson-3.13.3.jar:3.13.3] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:104) ~[redisson-3.13.3.jar:3.13.3] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final] at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.51.Final.jar:4.1.51.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.51.Final.jar:4.1.51.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.51.Final.jar:4.1.51.Final] at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na] 解决方法

2023-07-15 上传

2023-07-13 09:15:56,872 WARN org.apache.flink.runtime.dispatcher.DispatcherRestEndpoint [] - Unhandled exception java.io.IOException: Connection reset by peer at sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[?:1.8.0_372] at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39) ~[?:1.8.0_372] at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) ~[?:1.8.0_372] at sun.nio.ch.IOUtil.read(IOUtil.java:192) ~[?:1.8.0_372] at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379) ~[?:1.8.0_372] at org.apache.flink.shaded.netty4.io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253) ~[flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1132) ~[flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350) ~[flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [flink-dist-1.15.3.jar:1.15.3] at java.lang.Thread.run(Thread.java:750) [?:1.8.0_372]

2023-07-14 上传