[ZODB-Dev] RFC: Python2 - Py3k database compatibility

[Tres Seaver]

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On 04/29/2013 09:48 AM, Jim Fulton wrote:
> On Sun, Apr 28, 2013 at 8:34 PM, Stephan Richter 
> <stephan.richter at gmail.com> wrote:
>> On Sunday, April 28, 2013 07:23:12 PM Jim Fulton wrote:
>>> Can ZODB 4 be used now without zodbpickle?
>> 
>> No, unfortunately for Py2 we need the custom cPickle and for Py3
>> `noload()` support (as Tres mentioned).
> 
> This is a problem.
> 
> The only change in ZODB 4.0 was supposed to be the breakup.
> 
> This was supposed to be a low-risk release.  The separation into 
> multiple packages was supposed to increase agility, but now it appears
> we're stuck.

The only reason we had delayed the 4.0 release (in my mind, anyway) was
that it was a good way to signal the Py3k compatibliity changes.  I'm not
wedded to calling the Py3k-compatible release "4.0".

> I'd like there to a stable 4.0 release **soon** that doesn't use
> zodbpickle for Python 2.
> 
> For now, I suggest we focus on stability and the ability to make
> progress on non-Python-3-related work.
> 
> After that is achieved, I suggest we get to the point where people
> can create new databases and use them with Python 3.  We need to do 
> this without hindering the ability to make new stable releases.

The trunk of the 'ZODB' package does not have any of the Py3k /
zodbpickle changes yet.  We could make a ZODB 4.0b1 release from the
trunk today and create a '4.0' stable branch prior to any merge of the
'py3' work.

> As far as the grander vision for Python2/3 transition and
> interoperability, we need to make progress incrementally and not
> sacrifice stability of the master branch.
> 
> I made the 3.11 release fully expecting a stable 4.0 release soon.

That was of the 'ZODB3' meta-package, right?


Tres.
- -- 
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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