I am happy with this branch of the thread!
I'm guessing this would start post-Mimic though, if no one objects and
if we want to target a March release?
-Joao
On 09/23/2017 02:58 AM, Sage Weil wrote:
On Fri, 22 Sep 2017, Gregory Farnum wrote:
On Fri, Sep 22, 2017 at 3:28 PM, Sage Weil <s...@newdream.net> wrote:
Here is a concrete proposal for everyone to summarily shoot down (or
heartily endorse, depending on how your friday is going):
- 9 month cycle
- enforce a predictable release schedule with a freeze date and
a release date. (The actual .0 release of course depends on no blocker
bugs being open; not sure how zealous 'train' style projects do
this.)
Train projects basically commit to a feature freeze enough in advance
of the expected release date that it's feasible, and don't let people
fake it by rushing in stuff they "finished" the day before. I'm not
sure if every-9-month LTSes will be more conducive to that or not — if
we do scheduled releases, we still fundamentally need to be able to
say "nope, that feature we've been saying for 9 months we hope to have
out in this LTS won't make it until the next one". And we seem pretty
bad at that.
I'll be the first to say I'm no small part of the "we" there. But I'm
also suggesting that's not a reason not to try to do better. As I
said I think this will be easier than in the past because we don't
have as many headline features we're trying to wedge in.
In any case, is there an alternative way to get to the much-desired
regular cadence?
- no more even/odd pattern; all stable releases are created equal.
- support upgrades from up to 3 releases back.
This shortens the cycle a bit to relieve the "this feature must go in"
stress, without making it so short as to make the release pointless (e.g.,
infernalis, kraken). (I also think that the feature pressure is much
lower now than it has been in the past.)
This creates more work for the developers because there are more upgrade
paths to consider: we no longer have strict "choke points" (like all
upgrades must go through luminous). We could reserve the option to pick
specific choke point releases in the future, perhaps taking care to make
sure these are the releases that go into downstream distros. We'll need
to be more systematic about the upgrade testing.
This sounds generally good to me — we did multiple-release upgrades
for a long time, and stuff is probably more complicated now but I
don't think it will actually be that big a deal.
3 releases back might be a bit much though — that's 27 months! (For
luminous, the beginning of 2015. Hammer.)
I'm *much* happier with 2 :) so no complaint from me. I just heard a lot
of "2 years" and 2 releases (18 months) doesn't quite cover it. Maybe
it's best to start with that, though? It's still an improvement over the
current ~12 months.
Somewhat separately, several people expressed concern about having stable
releases to develop against. This is somewhat orthogonal to what users
need. To that end, we can do a dev checkpoint every 1 or 2 months
(preferences?), where we fork a 'next' branch and stabilize all of the
tests before moving on. This is good practice anyway to avoid
accumulating low-frequency failures in the test suite that have to be
squashed at the end.
So this sounds like a fine idea to me, but how do we distinguish this
from the intermediate stable releases?
By which I mean, are we *really* going to do a stabilization branch
that will never get seen by users? What kind of testing and bug fixing
are we going to commit to doing against it, and how do we balance that
effort with feature work?
It seems like the same conflict we have now, only since the dev
checkpoints are less important they'll lose more often. Then we'll end
up having 9 months of scheduled work to debug for a user release
instead of 5 months that slipped to 7 or 8...
What if we frame this stabilization period in terms of stability of the
test suite. That gives us something concrete to aim for, lets us move on
when we reach some threshold, and aligns perfectly with the thing that
makes it hard to safely land new code (noisy test results)...
sage
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