[DISCUSS] Breakout discussion on storefile tracking storage solutions

[Josh Elser]

Hi folks,

This is a follow-on for the HBASE-24749 discussion on storefile 
tracking, specifically focusing on where/how do we store the list of 
files for each Store.

I tried to capture my thoughts and the suggestions by Duo and Wellington 
in this google doc [1].

Please feel free to ask for edit permission (and send me a note if your 
email address isn't one that I would otherwise recognize :) ) to 
correct, improve, or expand on any other sections.

FWIW, I was initially not super excited about a per-Store file, but, the 
more I think about it, the more I'm coming around to that idea. I think 
it will be more "exception-handling", but avoid the long-term 
operational burden of yet-another-important-system-table.

- Josh

[1] 
https://docs.google.com/document/d/1yzjvQvQfnT-M8ZgKdcQNedF8HssTnQR2loPkZtlJGVg/edit?usp=sharing