[openstack-dev] [trove] Start to port Trove to Python 3 in Mitaka cycle?

Amrith Kumar amrith at tesora.com
Thu Feb 18 15:06:40 UTC 2016

Great, so in response to your email (below) and Flavio's email [1], I submit to you that the way to handle this is as we had discussed at earlier meeting(s) and that is to wait for Newton.



[1] http://openstack.markmail.org/thread/4uksb3kmhnagoc5a

> -----Original Message-----
> From: Victor Stinner [mailto:vstinner at redhat.com]
> Sent: Thursday, February 18, 2016 9:42 AM
> To: OpenStack Development Mailing List (not for usage questions)
> <openstack-dev at lists.openstack.org>
> Subject: Re: [openstack-dev] [trove] Start to port Trove to Python 3 in
> Mitaka cycle?
> Le 18/02/2016 14:15, Amrith Kumar a écrit :
> > Let's definitely discuss this again once you have all the changes that
> you feel should be merged for Mitaka ready.
> I don't like working on long patch series. In my experience, after more
> than 4 patches, it's more expensive to maintain the patch serie than to
> write patches. So I prefer to work on few patches, wait until they are
> merged, and then write following patches.
> I'm not going to write dozens of patches. I suggest to do as I done in the
> paste, make progress with baby steps :-)
> For example, my first change only changes the py34 test environment in
> tox.ini, it cannot break anything on Python 2, and it's enough to fix "tox
> -e py34". It is not in conflict with any other pending change.
> https://review.openstack.org/#/c/279098/
>  From this point, we can add a voting gate to be able to validate
> following Python 3 changes.
>  > What I would like to avoid is a dribble of changes where we don't
> know how much more we have coming down the pike.
> You have to be prepared for dozens of small patches. It only depends on
> the size of your project (number of code line numbers) :-)
> To have an idea, you can see the Cinder blueprint which has an
> exhaustive list of all changes made for Python 3:
> https://blueprints.launchpad.net/cinder/+spec/cinder-python3
> I counted 100 patches between June 2015 and February 2016.
> FYI with all my pending patches for Cinder (only 4 changes remain), all
> unit tests will pass on Python 3!
> It also gives you an idea of the time frame: it took me 9 months to port
> Cinder unit tests to Python 3. So more than a single OpenStack cycle (6
> months).
> Since the port is long and painful, I would like to start as soon as
> possible :-)
>  > And while your changes may be "low risk", it does mean that if they
> merge now, the large feature sets that we have committed for this
> release will have to go through the cycle of merge conflicts, rebasing,
> code review, gate ... and so on.
> The principle of technical debt is that the price only is only
> increasing if you wait longer :-) Merging Python 3 today or tomorrow
> doesn't solve the problem of merge conflicts :-)
> It's really up to you to decide to "open the gate" for the flow of
> Python 3 patches, it's also up to you to control how much Python 3
> changes will merged. I can only offer my help to port code. I don't feel
> able to decide when it's the best time to start porting Trove ;-)
> By the way, Gerrit provides a great "Conflicts With" information! It
> also helps to decide if it's ok to merge a Python 3 change, or if it's
> better to focus on the other changes in conflict.
> Victor
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