On Wed, 2016-09-28 at 12:31 -0500, Bowen Wang wrote:
> I think maybe it is just a coincidence, after I run the 
> dnf upgrade --refrsh
> at the first time, the mirror I am using just got the latest update. So
> I can upgrade my system when running the second time.

To be clear, the mirror system is - intentionally - not deterministic
(in most cases); each time you hit the metalink URL it will give you a
slightly different list of mirrors (usually the same handful of mirrors
in your geographic area, but in a different order). You can see this
easily by just opening e.g. this URL:

https://mirrors.fedoraproject.org/mirrorlist?repo=fedora-rawhide&arch=x86_64

in a browser and refreshing it a few times. You'll see different
mirrors from me, for a start - I get North American ones - but each
time you refresh the page, the order will change.

This is done to ensure that load is spread around between mirrors. So
you probably simply got a different server the second time you ran 'dnf
--refresh update' compared to the first.
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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