Netty Server接受连接但不执行任何操作

Question

我没有找出此错误的原因“在发生以下异常后，我的Netty Server没有处理任何消息。”

  org.jboss.netty.channel.SimpleChannelHandler - EXCEPTION, please implement com.kakapo.unity.handler.RegistrationHandler.exceptionCaught() for proper handling.
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 223,384,284 milliseconds ago.  The last packet sent successfully to the server was 223,384,284 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3364)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1983)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2293)
    at snaq.db.CachedPreparedStatement.executeQuery(CachedPreparedStatement.java:81)
    at com.kakapo.unity.handler.CustomIPFilterHandler.accept(CustomIPFilterHandler.java:46)
    at org.jboss.netty.handler.ipfilter.IpFilteringHandlerImpl.handleUpstream(IpFilteringHandlerImpl.java:118)
    at org.jboss.netty.handler.logging.LoggingHandler.handleUpstream(LoggingHandler.java:333)
    at org.jboss.netty.channel.Channels.fireChannelConnected(Channels.java:227)
    at org.jboss.netty.channel.socket.nio.NioWorker$RegisterTask.run(NioWorker.java:187)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processRegisterTaskQueue(AbstractNioWorker.java:430)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:329)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:35)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.net.SocketException: Connection timed out
    at java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3345)
    ... 17 more

但是我已经将auto reconnect = true应用于我的JDBC。 并且也在使用OrderedMemoryAwareThreadPoolExecutor

ExecutionHandler channelExecutionHandler = new ExecutionHandler(new OrderedMemoryAwareThreadPoolExecutor(Runtime.getRuntime()
                .availableProcessors(), 0, 0)); 

我使用awaituninteruptable函数关闭通道。 喜欢

ctx.getChannel().write(new ErrMessage(e.getChannel().getRemoteAddress().toString()).getEncodedMessage())

这是否导致任何类型的无限循环活动。 现在的情况是服务器接受连接并且不处理任何类型的消息。我们有工作线程和上司。 但是日志记录处理程序工作正常。 我正在使用snaq.db.connection池维护数据库连接。

Answer 1

您似乎很直接地将MySQL连接与DriverManager.getConnection() 。 因此，您要么根本不关闭打开的连接，要么创建太多的连接，以致超出了MySQL服务器的限制。

在高度并行的环境中（并且肯定为此实现了Netty），我强烈建议使用数据库连接池： c3p0或commons-dbcp 。 使用正确的设置，您可以避免MySQL连接问题。