[DISCUSS] Increase stability on o.a.h.h.Tag?

[Josh Elser]

Hiya,

(Background, I'm starting what is likely to be an onerous task of 
looking through downstream components and seeing what is broken with the 
latest hbase-2.0.0*)

Looking at YARN's use of HBase for the Application TimelineServer, I see 
that they're relying on the Tag interface.

Presently, Tag is marked as Private, yet we expose it via the Public 
CellUtil.

My gut reaction is that we should bump Tag up Public since the intent is 
for downstream users to, ya know, use those Tags. Any objections?

If we don't want to expose Tag, we should make a pass over the Public 
methods and mark them as Private (so not as to provide a Public method 
with Private objects). CellUtil#getTag(Cell, byte) would be one such 
example.

- Josh