Let's get the discussion started early on when we'll drop hadoop 2 support.
As of ACCUMULO-4826 we are poised to have Hadoop 2 and Hadoop 3 supported in 1.y releases as of 1.9.0. That gives an upgrade path so that folks won't have to upgrade both Hadoop and Accumulo at the same time. How about Accumulo 2.0.0 requires Hadoop 3? If there's a compelling reason for our users to stay on Hadoop 2.y releases, we can keep making Accumulo 1.y releases. Due to the shift away from maintenance releases in Hadoop we'll need to get more aggressive in adopting minor releases.
