branch-1.4 merge ettiquite

[Patrick Wendell <pw...@gmail.com>]

Hey All,

Since we are now voting, please tread very carefully with branch-1.4 merges.

For instances, bug fixes that don't represent regressions from 1.3.X,
these probably shouldn't be merged unless they are extremely simple
and well reviewed.

As usual mature/core components (e.g. Spark core) are more sensitive
than newer/edge ones (e.g. Dataframes).

I'm happy to provide guidance to people if they are on the fence about
patches. Ultimately this ends up being a matter of judgement and
assessing risk of specific patches. Just ping me on github.

- Patrick

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