No more deltarpms by default

[Reindl Harald]

Am 06.10.2014 um 13:00 schrieb Richard W.M. Jones:
> On Mon, Oct 06, 2014 at 04:41:07AM -0400, Rahul Sundaram wrote:
>> 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

because it needs to build the complete xz-compressed RPM
there was a discussion here not that long ago

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