Question

Netty Server引导程序：

EventLoopGroup bg = new NioEventLoopGroup(1, new CamelThreadFactory("Thread#", "NettyServerTCPBoss", false));
EventLoopGroup wg = new NioEventLoopGroup(Runtime.getRuntime().availableProcessors() * 2, new CamelThreadFactory("Thread#", "NettyServerTCPWorker", false));
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.childOption(ChannelOption.SO_KEEPALIVE,true);
serverBootstrap.childOption(ChannelOption.TCP_NODELAY, true);

Netty管道配置：

    ch.pipeline().addLast("encoder", new StringEncoder());
    ch.pipeline().addLast("decoder", new RequestPayloadDecoder())); //This extends ByteToMessageDecoder
    ch.pipeline().addLast("idlehandler", new IdleStateHandler(..));
    ch.pipeline().addLast(new DefaultEventExecutorGroup(100),"handler", new 
org.apache.camel.component.netty4.handlers.ServerChannelHandler());

将自动读取设置为false

public void channelActive(ChannelHandlerContext ctx) throws Exception {
InetSocketAddress clientAddress = ((InetSocketAddress) ctx.channel().remoteAddress());
ctx.channel().config().setAutoRead(false);
ctx.channel().read();
}

channelRead0（）上的处理程序逻辑

 public void process(ChannelHandlerContext nettyChannelContext) throws Exception {
    if(validate() && channel.isWritable()){
    outboundMessages = //get from database
    for(List<Outbound> outbound : outboundMessages){
    if(channel().isWritable()){
    ChannelFuture writeFuture = nettyChannelContext.channel().writeAndFlush(outbound.getString()); //Send the message
    writeFuture.sync(); // wait for the IO to complete
    logger.info("Updating message status for event row id {}",outbound.getRowId);
    updateMessageStatusInDb(outbound);
    } } }
    ctx.channel.read();//Call read() after writes are done to process next inbound message 
    }

问题一切似乎都正常，但间歇性地将其卡在writeFuture.sync（）上超过10分钟。我试过使用监听器而不是sync（）。但是，需要花费相似的时间来接收operationComplete（）回调。
示例日志：
2019-06-18 14：16：39.263 [Camel Thread＃20-NettyEventExecutorGroup]信息正在更新事件行ID的消息状态::: 40257
2019-06-18 14：16：39.265 [Camel Thread＃20-NettyEventExecutorGroup]信息正在更新事件行ID的消息状态::: 40263
2019-06-18 14：16：39.266 [Camel Thread＃20-NettyEventExecutorGroup]信息正在更新事件行ID的消息状态：:: 40269
2019-06-18 14：30：09.982 [Camel Thread＃20-NettyEventExecutorGroup]信息正在更新事件行ID的消息状态：:: 40275
2019-06-18 14：30：09.987 [Camel Thread＃20-NettyEventExecutorGroup]信息正在更新事件行ID的消息状态::: 42691

为什么IO需要这么长时间才能完成，对于发送的每30k消息，恰好有40-50条消息。您能提供一些提示吗？

Netty WriteAndFlush间歇性卡住

0 个答案: