Re: Proposal: Faster composes by eliminating deltarpms and using zchunked rpms instead

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Jonathan Dieter wrote:
> My proposal would be to make zchunk the rpm compression format for
> Fedora.

Given that:
1. zchunk is based on zstd, which is typically less efficient in terms of
   compression ratio than xz, depending on settings
   (see, e.g., https://github.com/inikep/lzbench), and
2. zchunk can by design only compress chunks individually and not benefit
   from the space savings of a solid archive with a global dictionary,
I fear that this is going to significantly increase the size of the RPMs, 
which matters:
* for the initial downloads,
* for storage (e.g., keepcache=1, local mirrors, etc.), and
* for the people not using deltas for whatever reason.

I think zchunk makes a lot of sense for the metadata, but I am not convinced 
that it is the right choice for the RPMs themselves.

        Kevin Kofler
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