Fedora 29 To Change DNF's Repository Metadata Compression To Zchunk
Written by Michael Larabel in Fedora on 2 July 2018 at 05:55 AM EDT. 6 Comments
FEDORA --
Fedora 29 continues looking like a rather ambitious release with a growing number of changes, including at some of the lowest levels of the system. The latest feature proposal is on changing the compression scheme used by the DNF package manager's repository metadata.

Right now Fedora's DNF uses XZ and Gzip formats for the compressing of the repository metadata. With Fedora 29+, Zchunk would instead be used.

Using Zchunk should provide for better compression and only needing to download the differences between any earlier copies of the metadata on the system. With this change, users should see a "significant reduction" in the download size when acquiring the repository metadata for new package installation or updates.

Fedora would still keep XZ and Gzip metadata around for those wanting to upgrade from older Fedora releases where their DNF is not Zchunk-aware while any new installations or those post-upgrade would default to using the new Zchunk scheme.

More details via this change proposal.

For those that don't recall, back in May is when Zchunk was announced with its format inspired by Zsync and Casync while being designed for delta-friendly files. Zchunk relies upon Zstd for compression.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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