A reply from a Google rep on this matter would be much appreciated.
On Oct 16, 9:55 pm, Raviv Pavel <street...@gmail.com> wrote:
> I'm afraid you don't understand the problem.
> The issue is how to "notify" all instances of the app that they should
> reload their in-memory cached data.
> Cron jobs and tasks send request so a single instance of the app, not
> to all of them.
>
> On Oct 16, 5:21 pm, Jean Meurtrier <jm.truil...@bikerider.com> wrote:
>
> > I don't exactly understand what you want to do, but you write you
> > cannot use a timer and you need to be triggered by incoming requests.
> > Why not use the cron jobs or the task queues?
>
> > JMT
>
> > On Oct 15, 9:58 pm,RavivPavel <street...@gmail.com> wrote:
>
> > > Most web apps I build need to cache data which falls into two
> > > categories:
>
> > > 1. Configuration and lookup lists such as IP-to-country and
> > > configuration - loaded from file into static member and reloaded when
> > > a file change is detected.
> > > 2. User generated lists such as tags, product list, etc - loaded from
> > > DB into static fields, and either periodically reloaded, or broadcast
> > > change to all servers (e.g. UDP)
>
> > > Using static fields gives me better performance than memcache when
> > > accessing long lookup lists on every request,
>
> > > I'm not sure how to approach this in GAE especially since I can't use
> > > a timer to watch a file or periodically reload from DB. The options I
> > > see are:
>
> > > For scenario 1:
> > > a. Redeploying the app with the new static config and lookup files - a
> > > bit risky since I can accidenty deploy new code.
> > > b. Periodically reload the file - Since there is no Timer, it will
> > > have to be triggered by incoming requests. Ugly :(
>
> > > For scenario 2:
> > > a. Load from Datastore into memcache and invalidate upon update -
> > > Slower than static member and may drain quota fast since I need to
> > > serve around 20 million req/hour at peek times.
> > > b. somehow issue a request to every active instance of my app to
> > > invalidate its static cache - Is this possible?
>
> > > Any advice would be much appreciated.
>
> > >Raviv.
>
>
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