From d7f7c3aa64d2e3d55614685c87847f5c3ebf4ddc Mon Sep 17 00:00:00 2001 From: Petr Bokoc Date: Jun 04 2019 11:36:58 +0000 Subject: 285 - zchunk DNF metadata --- diff --git a/modules/release-notes/pages/sysadmin/Distribution.adoc b/modules/release-notes/pages/sysadmin/Distribution.adoc index be9f9a4..5311c84 100644 --- a/modules/release-notes/pages/sysadmin/Distribution.adoc +++ b/modules/release-notes/pages/sysadmin/Distribution.adoc @@ -59,6 +59,10 @@ For detailed information, see the following FAQ articles: * link:https://hansdegoede.livejournal.com/19081.html[GRUB hidden menu FAQ] * link:https://hansdegoede.livejournal.com/20632.html[Flicker Free Boot FAQ] +== DNF repository metadata is now encrypted using zchunk + +Fedora 30 provides improved compression for DNF package metadata, resulting in significantly reduced size of metadata being downloaded. See xref:sysadmin/System_Utilities.adoc#system-utilities-zchunk[System Utilities] for details. + == Updated software Please note that this only lists a small subset of all upgraded packages where there's a significant change. diff --git a/modules/release-notes/pages/sysadmin/System_Utilities.adoc b/modules/release-notes/pages/sysadmin/System_Utilities.adoc index dc67479..a07d77c 100644 --- a/modules/release-notes/pages/sysadmin/System_Utilities.adoc +++ b/modules/release-notes/pages/sysadmin/System_Utilities.adoc @@ -11,3 +11,17 @@ This mechanism has been replaced by the configuration file `/etc/nfs.conf`. Each of the services that compose the NFS server stack reads this file on its own and uses the relevant parts, and `/etc/sysconfig/nfs` is not read anymore. On upgrades, automatic conversion from `/etc/sysconfig/nfs` to `/etc/nfs.conf` is performed by the `nfs-convert.service` systemd service. + +[[system-utilities-zchunk]] +== DNF repository metadata is now compressed using zchunk + +In Fedora 30, **DNF** package repository metadata is compressed using the `zchunk` format in addition to `xz` and `gzip` formats used previously. + +`zchunk` is a new compression format designed to allow for highly efficient deltas. When Fedora's metadata is compressed using `zchunk`, DNF will download only the differences between any earlier copies of the metadata and the current version. DNF and related tools will see significant reductions in the size of the metadata they download, especially if they are run on a regular basis. + +For more information about `zchunk`, see the following articles by the change owner: + +* link:https://www.jdieter.net/posts/2018/04/30/introducing-zchunk/[Introducing zchunk] +* link:https://www.jdieter.net/posts/2018/05/31/what-is-zchunk/[What is zchunk?] +* link:https://github.com/zchunk/zchunk/blob/master/README.md[How to use the zchunk utilities] +* link:https://github.com/zchunk/zchunk/blob/master/zchunk_format.txt[The zchunk file format]