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@@ -11,3 +11,17 @@
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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.
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On upgrades, automatic conversion from `/etc/sysconfig/nfs` to `/etc/nfs.conf` is performed by the `nfs-convert.service` systemd service.
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+
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+ [[system-utilities-zchunk]]
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+ == DNF repository metadata is now compressed using zchunk
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+
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+ In Fedora 30, **DNF** package repository metadata is compressed using the `zchunk` format in addition to `xz` and `gzip` formats used previously.
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+
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+ `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.
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+
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+ For more information about `zchunk`, see the following articles by the change owner:
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+
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+ * link:https://www.jdieter.net/posts/2018/04/30/introducing-zchunk/[Introducing zchunk]
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+ * link:https://www.jdieter.net/posts/2018/05/31/what-is-zchunk/[What is zchunk?]
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+ * link:https://github.com/zchunk/zchunk/blob/master/README.md[How to use the zchunk utilities]
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+ * link:https://github.com/zchunk/zchunk/blob/master/zchunk_format.txt[The zchunk file format]
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pbokoc
commented 4 years ago
Fixes #285. However the bug (https://bugzilla.redhat.com/show_bug.cgi?id=1601595) is still on ON_QA for some reason, so I'm not sure if it actually made it to F30 or not. I contacted the change owner for clarification and I'll hold off on merging this until he gets back to me.