Software Management call for RFEs

Jan Zeleny jzeleny at redhat.com
Tue May 28 18:42:29 UTC 2013


Dne Út 28. května 2013 11:51:21, seth vidal napsal(a):
> On Tue, 28 May 2013 08:51:03 +0200
> 
> Jan Zelený <jzeleny at redhat.com> wrote:
> > > after a "yum clean metadata && yum update" on a slow line you
> > > have to wait a very long time and even the download of the
> > > presto-metadata often is larger and takes longer as the
> > > packages which are updated in reality
> > > 
> > > hey on my 100 Mbit all is nice and fine but on a machine behind
> > > DSL with around 100 KB/Second it is way too slow and large and
> > > i refuse to imagine how this feels on a 56kbit modem
> > 
> > I couldn't agree more. But as I have said, we need to find the most
> > simple and unintrusive things that can be done to improve this. For
> > instance: file lists take a considerable portion of the entire
> > metadata size. But if we were to remove them, things like "yum
> > install /usr/bin/vim" would not work any more. And you get similar
> > scenario with almost all the metadata that we store - we store them
> > for a reason and without them some things that people use will not
> > work.
> 
> Jan,
>  the above is not correct.
> Files in *bin/* are in the primary metadata - not in the filelists.
> That was specifically designed to handle the 90% of file-deps which are
> *bin/* or /etc/*. It's not accidental.
> 
> so if you nuked filelists entirely you'd only lose people who have
> filedeps on something outside of those wildcards above. I've spent
> HERCULEAN amounts of effort to whittle down the set of filedeps outside
> of that area. I filed hundreds of bugs on the subject in years passed.
> I simply got tired of tilting at that particular windmill when
> confronted with some particularly egregious cases (see libguestfs
> sometime).
> 
> 
> But it is absolutely NOT TRUE that removing filelists will cause 'yum
> install /usr/bin/vim' to not work.
> 
> If you have further questions about how the metadata works or was
> designed please feel free to ask me, directly. I believe I and Adrian
> Likins are the only current Red Hat Employees or Fedora Contributors
> who were present/involved in its original 'design'. Such as it was.
> 
> It might prove helpful to know that background to avoid walking down
> blindalleys in DNF.

I knew there were some optimizations in the filelist case, I just wasn't 
completely sure what exactly would cause downloads of the filelist.

Anyway, thanks for the explanation
Jan


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