On Thu, Jul 19, 2018 at 3:26 PM, Neal Gompa <ngomp...@gmail.com> wrote:
> On Wed, Jul 18, 2018 at 8:37 PM Terry Bowling <tbowl...@redhat.com> wrote:
>>
>> Regarding these two questions:
>>
>>>> Are there any concerns about such change?
>>>> I believe that >90% users wouldn't notice anything as it's related to the 
>>>> history database only.
>>
>>
>>>
>>> On Wed, Jul 18, 2018 at 10:01 AM Igor Gnatenko 
>>> <ignatenkobr...@fedoraproject.org> wrote:
>>> Since we've changed the database entirely, what's the point of keeping same 
>>> algorithm for calculating checksum?
>>
>>
>>> On Wed, Jul 18, 2018 at 9:34 AM Daniel P. Berrangé <berra...@redhat.com> 
>>> wrote:
>>> What's the benefit in changing to be compatible with YUM as opposed
>>> to stickin with current alogorithm ?
>>>
>>> Surely if we don't change it, even fewer users will notice that DNF's
>>> behaviour is different from YUM's, since DNF has been the default for
>>> many releases now.
>>>
>>> I could understand the motiviation to stay compatible with YUM if we
>>> were only just about to switch Fedora from YUM to DNF, but time is
>>> way in the past now. Shouldn't we optimize for the fact that DNF is
>>> the more widely deployed & used tool, and thus not worry about
>>> YUM compatibility in respect of the history DB ?
>>
>>
>> It is true that going forward in the Fedora world it matters less.  It is 
>> more of an impact for yum-3 compatibility as yum4/dnf is being considered in 
>> the RHEL7/CentOS7 userspace environments as described at 
>> https://blog.centos.org/2018/04/yum4-dnf-for-centos-7-updates/
>>
>> Currently yum version 3 and what the proof-of-concept project is calling 
>> yum4 work very well together side by side.  Users can safely switch back and 
>> forth.  The major problem is yum/dnf histories being different and the rpmdb 
>> checksum difference is a blocker for resolving the history compatibility.
>>
>> So think of this as an effort to bring package management parity between 
>> Fedora, RHEL 7, & CentOS7, as the latter two still have a long life ahead of 
>> them.
>>
>
> Is there a reason why we can't change YUM to match the DNF behavior?
> IMO, the YUM behavior is nonsense and isn't even a valid package
> identifier.

What about all the enterprise applications and other traditional
platforms that are deployed that expect the existing functionality or
outcomes, not saying it's necessarily correct but there's a lot of
technical debt out there. In a lot of cases there's legacy out there
that needs to be supported and that requires existing APIs to work as
they currently do so there can be migrations.

Peter
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