2 problem about udp

[lyl]

Hi Trustin Lee,

I meet 2 problems about netty udp：

1） About OIO udp. Thread can be blocked for seconds after creating dozens of
channels. But NIO doesn't have this problem. The test code is as below:

ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(new
OioDatagramChannelFactory(Executors.newCachedThreadPool()));
		
  // After creating some channels, the thread is paused for some seconds,
very strange...
  for (int i = 0; i < 500; i++) {
			
  DatagramChannel channel = (DatagramChannel)bootstrap.bind(new
InetSocketAddress(0));
			
  channel.connect(new InetSocketAddress("10.72.4.94", 5000));
			
  System.out.println(i);
  }
		


2) Also about udp, but is NIO mode. I tried to send empty data with udp,
which lead to OIO work thread dead loop. The test code is as below:

ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(new
NioDatagramChannelFactory(Executors
				.newCachedThreadPool()));
  DatagramChannel channel = (DatagramChannel) bootstrap.bind(new
InetSocketAddress(0));

  byte[] bytes = new byte[0];

  ChannelBuffer channelBuffer = ChannelBuffers.wrappedBuffer(bytes);
  
  channel.write(channelBuffer, new InetSocketAddress("192.168.0.190",
8000)).awaitUninterruptibly();

  // The program can not execute to here...

  System.out.println("ok");



  After simple debug, I found the dead loop lies here: 
  
  NioDatagramWork(line:533)
  ...
      for (int i = writeSpinCount; i > 0; i --) {
             localWrittenBytes = buf.transferTo(ch);
             if (localWrittenBytes != 0) {
                  writtenBytes += localWrittenBytes;
                  break;
             }
      }
 ...
 Because the data length is 0, so the "localWrittenBytes != 0" would never
meet. Is the problem here?


Above is the problem I meet, any reply is appreciated. 

Best regards!

Lu Yanliang

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