Here's a question and answers on what delta RPMs actually are: What is DRPM and How does it differ from RPM?

I'm interested in the algorithms and data structures server side. I've Googled but nothing useful shows up.

Do they (Red Hat) generate the requested delta on the fly, or are all possible deltas pregenerated and made available as soon as a new RPM comes out?


Deltas are generated when repo is created/updated. Usually:

createrepo_c --update --deltas --num-deltas 1 .

For more information see man createrepo_c and man makedeltarpm

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