Support Netty 4.x about asynchbase

[tsuna]

How can we support both Netty 4.x and Netty 3.x?

My guess is that since going to Netty 4.x will break some of the AsyncHBase APIs, we'll have to jump to AsyncHBase 2.0 for this migration to happen. Are you willing to help change all the Netty code?

[dingwa]

Yes I'm thinking the same way.

Yes for sure. I'll start looking around the code in more detail to get more familiar.

[tsuna]

Awesome. But yeah I definitely agree we need to move to Netty 4.x, I just don't have the bandwidth to make the change (as you can tell from the amount of time it took me to follow up on this issue). If you want to take a lead and make it happen, please do.

[dingwa]

Unfortunately bandwidth on my side is minimal as well. However Netty 4.x should be in very stable state to warrant the move up. Let me have a look at it over time, unfortunately I can't give you timelines to when I can get this done. But I'll keep you posted (hopefully with some code!)

[tsuna]

It's OK, I totally understand everything we're all doing for AsyncHBase is on a "best effort" basis. Whoever sends a pull request first wins :)

[ooasis]

PR #116 has been submitted.