mina socket 通信 Too many open files Failed to open a selector

Posted 2021-03-29 纯洁的明依

服务背景：

流数据接收--> 解析过滤-->调用socket服务 写入mina服务。

服务器异常日志：

java.io.IOException: Too many open files Failed to open a selectorFailed to create a new instance of org.apache.mina.transport.socket.nio.NioProcessor:null

定位到问题代码：

 public void init() { NiosocketConnector connector = new NioSocketConnector(); connector.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory(Charset.defaultCharset()))); connector.setConnectTimeoutMillis(10000); connector.setHandler(new SocketClientHandler()); connector.getSessionConfig().setReceiveBufferSize(10240); // 设置接收缓冲区的大小 connector.getSessionConfig().setSendBufferSize(10240);// 设置输出缓冲区的大小 ConnectFuture cf = connector.connect( new InetSocketAddress(socketConfig.getSocketServerIp(), socketConfig.getSocketServerPort())); // 等待连接创建完成 cf.awaitUninterruptibly(); session = cf.getSession(); }

问题产生原因：
当mina服务端长时间连接不上 ，并发连接特别多的时候 都会导致上述问题。
解决方案：当连接不成功的时候 进行施放句柄。

修改之后：

 public void init() { NioSocketConnector connector = new NioSocketConnector(); connector.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory(Charset.defaultCharset()))); connector.setConnectTimeoutMillis(10000); connector.setHandler(new SocketClientHandler()); connector.getSessionConfig().setReceiveBufferSize(10240); // 设置接收缓冲区的大小 connector.getSessionConfig().setSendBufferSize(10240);// 设置输出缓冲区的大小 ConnectFuture cf = connector.connect( new InetSocketAddress(socketConfig.getSocketServerIp(), socketConfig.getSocketServerPort())); // 等待连接创建完成 cf.awaitUninterruptibly(); if (cf.isDone()) { if (!cf.isConnected()) { log.error("fail connect {} {}", socketConfig.getSocketServerIp(), socketConfig.getSocketServerPort()); connector.dispose(); throw new RuntimeException("Not connect to Mina Server"); } else { session = cf.getSession(); } } }

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