[Yum-devel] Looking for comments on Yum Fast Downloader and possible future enhancements in yum/yfd
seth vidal
skvidal at fedoraproject.org
Mon May 16 03:40:22 UTC 2011
On Sun, 2011-05-15 at 12:57 +0430, Hedayat Vatankhah wrote:
> Hi all,
> As you may already knew, still not having enough time to work on more
> fundamental things, I've create a simple yum plugin[1] which tries to
> take advantage of aria2c to provide faster downloads compared to current
> URLGrabber. Currently, it is activated for downloading metadata dbs and
> RPM packages. For the former, I override yum repo's _retrieveMD()
> (calling the original function at the end to make sure that everything
> is OK) and for the latter, I use a predownload hook.
>
> First, any comments on the code is highly appreciated, specially as it
> is my first serious yum code and it is not very long.
>
> Then, suggestions for future enhancements are very welcome. I'm
> specifically interested to be able to download metadata's in parallel,
> and also downloading delta rpms. The latter is achievable by overriding
> _getFile() when a whole file is going to be downloaded, but I would
> prefer to find a solution which let me download multiple delta rpms in
> parallel too. BTW, probably I should contact presto's author for this.
>
> Anyway, I'm looking forward for any comments in this regard.
>
A few things spring to mind:
1. downloading code in a plugin is always going to be plagued with
issues - especially for yum-utils or other things using yum - like from
a gui (yumex or pk).
2. you'll want to make sure you offer a lot/all of the same capabilities
of urlgrabber - things like certificate-based authentication does
actually matter.
3. Why not work on porting yum to using an external application call to
do downloads. If properly implemented, I think that code to make yum use
an external application to do downloads would be accepted into mainline
yum.
-sv
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