A recent JIRA about our hfile format[1] has got me thinking about expectations for upgrading. The specifics of that JIRA aren't terribly important; it's the general issue I want to talk about. A simplification of the mismatch in expectations between two groups is that some folks place the bar for "we support rolling upgrade" at rolling upgrade from 1.y.z* versions generally and others are comfortable requiring an initial upgrade to some later 1.y.z version first.
Have we documented what our goals are for upgrades this major release? Do we know what we have to do to get there? I've seen a few one-off JIRAs to fix particular problems, but not really a plan. We should discuss here a bit. When things have some consensus is anyone willing to take point on writing up the results in a scope document of sorts? I have a few good examples to point you to, though they're all for features. [1]: https://issues.apache.org/jira/browse/HBASE-19052
