yum <delta rebuild>?

[marcrblevins]

There is a huge kde updates today,
That the bottom of the list, stated:
<delta rebuild> Its going to be a huge download on that line, over 200 megs.

Been using Fedora since Fedora Core 1's birth.

That delta rebuild is new to me. What is this thingy?

Edit:

(66/76): net-tools-1.60-95.fc12_1.60-99.fc12.i686.drpm                                                                 | 154 kB     00:00
(67/76): oxygen-icon-theme-4.3.2-1.fc12_4.3.3-1.fc12.noarch.drpm                                                       | 2.4 MB     00:12
(68/76): planner-0.14.4-3.fc12_0.14.4-5.fc12.i686.drpm                                                                 | 251 kB     00:01
(69/76): qedje-0.4.0-2.fc12_0.4.0-4.fc12.i686.drpm                                                                     |  23 kB     00:00
(70/76): qzion-0.4.0-3.fc12_0.4.0-5.fc12.i686.drpm                                                                     | 8.8 kB     00:00
(71/76): sip-4.8.2-2.fc12_4.9.3-1.fc12.i686.drpm                                                                       |  55 kB     00:00
(72/76): sip-devel-4.8.2-2.fc12_4.9.3-1.fc12.i686.drpm                                                                 | 114 kB     00:00
(73/76): sound-theme-freedesktop-0.7-1.fc12_0.7-2.fc12.noarch.drpm                                                     |  11 kB     00:00
(74/76): system-config-printer-kde-4.3.2-1.fc12_4.3.3-1.fc12.i686.drpm                                                 |  12 kB     00:00
(75/76): webkitkde-0.0.1-0.2.20090924svn.fc12_0.0.2-0.1.20091109svn.fc12.i686.drpm                                     |  51 kB     00:00
(76/76): webkitpart-0.0.1-0.2.20090924svn.fc12_0.0.2-0.1.20091109svn.fc12.i686.drpm                                    |  88 kB     00:00
Finishing rebuild of rpms, from deltarpms
<delta rebuild>                                                                                                        | 211 MB     08:52
Presto reduced the update size by 84% (from 211 M to 36 M).
Package(s) data still to download: 2.6 M
(1/9): PyQt4-4.6.2-1.fc12.i686.rpm                                                                                     | 2.0 MB     00:09
(2/9): control-center-filesystem-2.28.1-5.fc12.i686.rpm                                                                |  47 kB     00:00
(3/9): fedora-usermgmt-default-fedora-setup-0.10-1200.fc12.noarch.rpm                                                  | 8.4 kB     00:00
(4/9): fedora-usermgmt-shadow-utils-0.10-1200.fc12.noarch.rpm                                                          | 9.4 kB     00:00
(5/9): file-5.03-11.fc12.i686.rpm                                                                                      |  42 kB     00:00
(6/9): file-libs-5.03-11.fc12.i686.rpm                                                                                 | 302 kB     00:02
(7/9): fontpackages-filesystem-1.35-1.fc12.noarch.rpm                                                                  | 8.4 kB     00:00
(8/9): kdeartwork-kxs-4.3.3-1.fc12.i686.rpm                                                                            |  60 kB     00:00
(9/9): ksysguardd-4.3.3-7.fc12.i686.rpm                                                                                |  72 kB     00:00
----------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                         151 kB/s | 2.6 MB     00:17
Running rpm_check_debug
Running Transaction Test

[dragonbite]

The Delta builds are supposed to be only what is changed, not the entire RPM. This way less is supposed to be needing to be downloaded.

A huge update in KDE? I'll have to check that out when I get home. Here's the part that should tell you what Delta is doing:

Presto reduced the update size by 84% (from 211 M to 36 M).

So you are downloading a fraction of the size you would have normally, because it is only the changes you are downloading, not the whole thing!

[marcrblevins]

Oh, I didn't see the Presto part. I never installed it, came in with the install's default.
Thanks Dragonbite.

Edit: Now I can't remember why I usually don't use presto. Is that the yum plugin that prevents you having kernel upates?
I'll just keep it in there for now.

[RahulSundaram]

@marcrblevins,

While Fedora 11 had this plugin available, this is the first release that we have enabled it by default. It saves a lot of time on downloads and doesn't prevent kernel updates or anything like that. If for any reason the delta download fails, it will fallback automatically to downloading the full RPM packages instead.

[marcrblevins]

Rahul, good choice having it enabled now. Saves the bandwidth. Cheers

[bashFish]

Sry - don't get it...

Why is he still downloading
<delta rebuild> | 211 MB 08:52
Or what's the meaning of this "delta rebuild" download?

It seems like he's downloading 211 + 36 MB instead of just ~211

[CiaW]

Sry - don't get it...

Why is he still downloading
<delta rebuild> | 211 MB 08:52
Or what's the meaning of this "delta rebuild" download?

It seems like he's downloading 211 + 36 MB instead of just ~211

Instead of downloading the complete updated rpm's -- which would have been 211mb, it's downloading just 36mb. The packages that end in .drpm are the delta rpm's that are just a fraction of what the complete updated package would be (i.e. just the changes) and then presto (or delta?) rebuilds the .drpm into the complete updated package as part of the update process. I hope I explained that mostly correct?

And, the yum plugin / package that doesn't seem to play well with kernel updates is yumex (which is a gui front-end to yum). I like it for being able to search for packages if I don't know what might do something I'm looking for. Otherwise I mostly now use a terminal for yum.