non-daemon thread with DefaultThreadFactory

[wu-xiang]

Why not set daemon to true in DefaultThreadFactory by default?
Our application will not terminate for this reason.

[Scottmitch]

I'm not sure if this has been considered but it would be a breaking change. Can you just use one of the constructors that allows you to control if threads are daemons?

[normanmaurer]

@wu-xiang if you correctly shutdown your resources (like the EventLoopGroup) there should be no problems. If it hangs you miss to shutdown stuff correctly which I consider a bad thing.

That said as @Scottmitch pointed out you can just use a different constructor and use a ThreadFactory which creates daemon threads if you really want to.