On Thu, Sep 23, 2010 at 4:54 AM, Kevin Reid <[email protected]> wrote:
> any idea why three of the posts at the top of the corkboard say "error >> contacting cajoling service"? >> > > * The communication with the cajoling service is unreliable. I think we're > running into App Engine HTTP client timeouts, but the errors don't indicate > that for sure. It might help to switch to async requests so that all the > cajoling for a given page occurs in parallel. > > * The caching of cajoled content is unnecessarily ephemeral, so the above > failure possibility occurs more than it has to. This would probably not be a > problem if the site had more traffic keeping the entries in the cache; or, > we could switch to keeping the cache in the database service instead of the > memcache service. > > Also, if a failure that isn't an explicit timeout occurs, then Caja > Corkboard caches that failure for nominally 5 seconds (but in practice, > longer than that); this was intended to prioritize fast page loads over > retrying in the event that the failure really is a permanent failure. > > > Regarding doing something about this, I think the first thing to try is > switching to async URL Fetch requests. If I recall the API properly, it > should be possible to change cajole.py's interface so that we can say "I'm > going to want the cajoled form of <some html>" for each posting and then > later "I actually need it now, block if you haven't got it yet" -- which is > no worse than promises WRT the CPU-heavy aspects. > > I *may* have time to work on this in the upcoming weekend. Please let me > know what priority you place on it (vs. canvas and Caja-CapTP work). > Canvas and Caja-Captp are both more important. The Corkboard is more urgent though, because I'll be using it again in some high profile talks: < http://jaoo.dk/aarhus-2010/presentation/Expressing%20security%20constraints%20using%20capabilities>, <http://jaoo.dk/aarhus-2010/presentation/Securing%20EcmaScript%205>, and < http://qconsf.com/sf2010/presentation/From+E+to+ECMAScript+and+Back+Again>. It makes a great demo! > > -- > Kevin Reid <http://switchb.org/kpreid/> > > > > -- Cheers, --MarkM
