I think it should be a bug when I reading source code of SocketIO.The code fragment is in write() method:

res = channel.write(tmp);

In java.nio.channels.WritableByteChannel#write(),it comments like this:

• Unless otherwise specified, a write operation will return only after

• writing all of the r requested bytes. Some types of channels,

• depending upon their state, may write only some of the bytes or possibly

• none at all. A socket channel in non-blocking mode, for example, cannot

• write any more bytes than are free in the socket's output buffer.

It hasn't illustrate clearly whether all data can be wrote when SocketChannel is in unblocking status.So I think the more strict code should like this:

while(tmp.hasRemaining()){channel.write(tmp);}