title: Channel.channelInterestChanged in Netty
body: <p>I am working with Netty Channels and when sending lots of data across the channel , I notice that the <code>Channel.channelInterestChanged</code> event gets fired, which immediately results in <code>Channel.isWritable()</code> to return false.(  there is another thread doing a <code>Channel.write()</code> and this thread fails immediately ). My question is : why is the Channel's interests getting changed ? or rather who is changing it ? Nothing in code that I wrote ( server or client ) changes the interests.</p>