Bret, Thanks for sharing, we appreciate it! -MC On Fri, Oct 23, 2009 at 11:43 AM, Trixter aka Bret McDanel < trix...@0xdecafbad.com> wrote:
> for anyone that is interested, in > <SRC>/contrib/trixter/scheduled_event.lua there is a script, which > admittedly is not very well tested (written last night) that allows for > mysql events to be scheduled to be run. > > Why mysql and not sched_api or similar? Well this allows the scheduled > events to survive past a reboot, shutdown, crash, alien abduction, or > other issue. It also is written in a way to allow for many switches to > each pull an event off one at a time and process them, thus distributing > the load. sched_api requires that the scheduled event exist on a > particular switch which can be a bit messy in some applications. > > So you can do a "hotel style wake up call" (good for getting out of > boring meetings or bad blind dates) or really anything you want. > > You can start/stop the script, even change the DB credentials without a > restart to allow for easier load management or maintenance. > > Its a trivial script, but I didnt see anything like this elsewhere. If > people have specific feature requests (like adding a machine column to > the table so that certain events can be scheduled only for specific > machines, or only pulling events when the load is under X) let me know > and I will look into doing that. > > The only problem that I saw last night was that it runs every > "heartbeat" (FS eventing system) and if you have more tasks to > accomplish in a given interval it can get a little backlogged and does > not do any notification to that effect. > > > -- > Trixter http://www.0xdecafbad.com Bret McDanel > pgp key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8AE5C721 > >
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