大佬，出现NettyX-Server-Worker-Epoll这个问题是啥原因呀?

[QianCYang]

[NettyX-Server-Worker-Epoll-4-4] c.g.n.p.s.DispatcherChannelHandler : handler exception. case=io.netty.channel.unix.Errors$NativeIoException: recvAddress(..) failed: Connection reset by peer, channel=[id: 0xd09192e2, L:/192.123.1.78:5783 - R:/192.168.90.187:56221]

[wangzihaogithub]

tcp连上后，读内容的过程中，tcp连接被对方close了
有可能是数据没传完，对方就关闭浏览器了。 或者客户端触发超时，直接close tcp连接了

[wangzihaogithub]

我下个版本，把这类异常去掉

[QianCYang]

java.net.SocketException: Connection reset
	at java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java:401) ~[na:na]
	at java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:434) ~[na:na]
	at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:259) ~[netty-buffer-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1132) ~[netty-buffer-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:357) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:553) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.86.Final.jar:4.1.86.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.86.Final.jar:4.1.86.Final]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]
	at com.github.netty.core.util.NettyThreadX.run(NettyThreadX.java:50) ~[classes/:na]

我在本地idea 启动了com.github.netty.http.HttpBootstrap 这个测试Springboot项目
然后另一个项目 通过
String forObject = restTemplate.getForObject("http://localhost:8080/test/hello?name=xiaowang", String.class);访问

随着另一个项目的关闭会出现上面的报错，报错率是100%的

[QianCYang]

java.net.SocketException: Connection reset
at java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java:401) ~[na:na]
at java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:434) ~[na:na]
at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:259) ~[netty-buffer-4.1.86.Final.jar:4.1.86.Final]
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1132) ~[netty-buffer-4.1.86.Final.jar:4.1.86.Final]
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:357) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:553) ~[netty-transport-4.1.86.Final.jar:4.1.86.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.86.Final.jar:4.1.86.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.86.Final.jar:4.1.86.Final]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.86.Final.jar:4.1.86.Final]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]
at com.github.netty.core.util.NettyThreadX.run(NettyThreadX.java:50) ~[classes/:na]

我在本地idea 启动了com.github.netty.http.HttpBootstrap 这个测试Springboot项目
然后另一个项目 通过
String forObject = restTemplate.getForObject("http://localhost:8080/test/hello?name=xiaowang", String.class);访问

随着另一个项目的关闭会出现上面的报错，报错率是100%的

[wangzihaogithub]

你客户端项目的 restTemplate的ClientHttpRequestFactory ， 应该用的是长链接的， 然后客户端项目shutdown时候，可能没有来得及执行完ClientHttpRequestFactory.destroy() 或shutdown。

[wangzihaogithub]

项目的关闭时，你应该还有正在读数据的请求还没执行完

[wangzihaogithub]

这个错误没影响，tomcat也有这个错误，应该log级别比较低，所以平时不会注意。

[QianCYang]

哦哦哦，好的

[QianCYang]

可以通过啥配置避免出现该问题吗？我这边一出现就是一大堆哦

[QianCYang]

可以通过啥配置避免出现该问题吗？我这边一出现就是一大堆哦

是这样处理吗？

[wangzihaogithub]

我是这样改的

       if (cause.getClass().getName().startsWith("io.netty.handler.codec.http2")) {
                  // ignore
              } else if (IOException.class.isAssignableFrom(cause.getClass())) {
                  if (logger.isDebugEnabled()) {
                      logger.debug("handler IOException. case={}, channel={}", cause.toString(), context.channel(), cause);
                  }
              } else {
                  logger.warn("handler exception. case={}, channel={}", cause.toString(), context.channel(), cause);
              }

[wangzihaogithub]

已经在2.3.19解决

#38