No more deltarpms by default

[Richard W.M. Jones]

On Mon, Oct 06, 2014 at 04:41:07AM -0400, Rahul Sundaram wrote:
> Hi
> 
> One of the long standing features that were enabled by default in yum is
> support for delta rpms.  dnf developers have disabled this and I think this
> change deserves a broader discussion
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1148208

The amount of time taken to rebuild rpms from delta rpms meant that
they didn't seem to save anything for me.

I had always assumed that this is because the rebuilding code was
written in Python.  In fact this is not so!  Although the yum-presto
plugin is written in Python, it just calls out to the applydeltarpm
program written in C (assuming I'm looking at the right place:
https://gitorious.org/deltarpm/deltarpm).

Has anyone analyzed why the rebuild step is slow?  Seems like the best
thing to do would be to make it faster if possible.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v