Re: Security updates and batched pushes

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> On Jan 9, 2018, at 9:59 AM, Kevin Fenzi <kevin@xxxxxxxxx> wrote:
>
>> On 01/08/2018 10:53 AM, Kevin Kofler wrote:
>> Kevin Fenzi wrote:
>>> Well, if this firefox update was urgent, shouldn't it have been marked
>>> urgent?
>>
>> Urgency is always in the eye of the beholder. I as a user consider all
>> security updates "urgent", and in addition, I want ALL updates as soon as
>> they passed testing no matter whether they actually are urgent.
>
> You also don't want updates-testing to even exist right?
>
>>
>>>> I really don't understand why we do this "batched" thing to begin with.
>>>
>>> To reduce the constant flow of updates that are very minor or affect
>>> very few mixed in with the major updates that affect lots of people and
>>> are urgent.
>>
>> But the users were already able to opt to update only weekly. So why force a
>> fixed schedule on them?
>
> To save all the Fedora users in the world from having to update metadata
> for minor changes. Since there's a hourly dnf makecache every user in
> the world pulls down new metadata ever time we update a repo.

Could Fedora, perhaps, come up with a way to make incremental metadata
updates fast?  This shouldn't be particularly hard -- a tool like
casync or even svn should work pretty well.  Or it could be a simple
ad-hoc thing.  Have the mirrors serve up both the whole metadata blob
and a list of metadata changes.  The client could grab the list of
changes from last time, compute a bitwise-identical blob, and verify
the signature on that, deltarpm style.  (But on the decompressed data,
of course -- no need to repeat the mistakes of the past.)

It seems that all this batched stuff is a rather weak hack to work
around the extreme inefficiency of Fedora's metadata distribution
model.
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