On Sat, Apr 14, 2018 at 12:37:24AM +0000, Stephen John Smoogen wrote:
> On Fri, Apr 13, 2018 at 11:14 AM Adrian Reber <adr...@lisas.de> wrote:
> 
> > I would like to change the setup of our mirror crawler and just wanted
> > to mention my planned changes here before working on them.
> >
> > Currently we have two VMs which are crawling our mirrors. Each of the
> > machine is responsible for one half of the active mirrors. The crawl
> > starts every 12 hours on the first crawler and 6 hours later on the
> > second crawler. So every 6 hours one crawler is accessing the database.
> >
> > Currently most of the crawling time is not spent crawling but updating
> > the database about which host has which directory up to date. With a
> > timeout of 4 hours per host we are hitting that timeout on some hosts
> > regularly and most of the time the database access is the problem.
> >
> > What I would like to change is to crawl each category (Fedora Linux,
> > Fedora Other, Fedora EPEL, Fedora Secondary Arches, Fedora Archive)
> > separately and at different times and intervals.
> >
> > We would not hit the timeout as often as now as only the information for
> > a single category has to be updated. We could scan 'Fedora Archive' only
> > once per day or every second day. We can scan 'Fedora EPEL' much more
> > often as it is usually really fast and get better data about the
> > available mirrors.
> >
> > My goal would be to distribute the scanning in such a way to decrease
> > the load on the database and to decrease the cases of mirror
> > auto-deactivation due to slow database accesses.
> >
> > Let me know if you think that these planned changes are the wrong
> > direction of if you have other ideas how to improve the mirror crawling.
> 
> These look like a good way to deal with the fact that we have a lot of data
> and files and mirrors nd users get confused about how up to date they are.
> Would more VM’s help spread this out also?

From my point of view the main problem is the load MirrorManager creates
on the database. Currently I do not think that more VMs would help the
crawling. Someone once mentioned a dedicated database VM for
MirrorManager. That is something which could make a difference, but
first I would like to see if crawling per category can improve the
situation.

                Adrian

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