title: Netty Threading Considerations
body: <p>We migrated from 3.x OIO to 4.x NIO due to a security vulnerability and have ran into lots of issues under heavy load.</p>
  <p>Below are items we are addressing and curious if anyone disagrees or has other considerations when it comes to threading in Netty 4.x using NioEventLoopGroup.</p>
  <ul>
  <li>Offload message handling from occurring within handlers to free up the NioEventLoopGroup threads</li>
  <li>Offload operationComplete handling within listeners to free up NioEventLoopGroup threads</li>
  </ul>