No more deltarpms by default

Richard W.M. Jones rjones at
Mon Oct 6 11:00:04 UTC 2014

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

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:

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


Richard Jones, Virtualization Group, Red Hat
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