HBASE-11536 Puts of region location to Meta may be out of order which causes inconsistent of region location. (Liu Shaohui)
HBASE-11610 Enhance remote meta updates
HBASE-11729 Document hfile v3.

* break out hfile appendix to its own file
* reorganize so that the section presents versions in order
* add section on v3

Signed-off-by: stack <stack@apache.org>
HBASE-11816 Initializing custom Metrics implementation failed in Mapper or Reducer