Yes, this feature request seems like a useful idea and earns a star from me.
It would also be interesting to better understand the routing algorithms - if App Engine could dynamically slice out multi-node clusters for individual apps and make an effort to route all requests to the nodes in these clusters, it would increase the likelihood of hitting a warm instance. For all I know, this may already be happening, but it's not clear to me. On Sep 21, 12:21 pm, Jason C <[email protected]> wrote: > There are currently some issues with application spin-up time, which > is impacting a number of Django (and webapp) applications. > > You can see more info here: > > http://code.google.com/p/googleappengine/issues/detail?id=1695 > > Please star it if appropriate. > > j > > On Sep 21, 11:08 am, vivpuri <[email protected]> wrote: > > > I think Django 1.0 is also supported. > > >http://code.google.com/p/googleappengine/issues/detail?id=872 > > > On Sep 21, 12:13 pm, pdub <[email protected]> wrote: > > > > Thanks Josh, I actually did have a cron job running in App Engine > > > itself. I tried running an external job because I wasn't sure whether > > > or not external and internal requests are routed differently. > > > > Are you running a custom app framework like Django or are you mostly > > > sticking to stuff built into App Engine? > > > > I may have to consider going with Django 0.96 which apparently is > > > built into AppEngine, but I'm not really looking forward to such a > > > migration. > > > > Cheers, > > > Percy > > > > On Sep 21, 11:04 am, Joshua Smith <[email protected]> wrote: > > > > > How about creating a cron job in the application itself and pinging > > > > more frequently? > > > > > I have a statistics-collection cron in one of my apps that runs once a > > > > minute. So I suppose I'm doing exactly what you describe, and I > > > > certainly do not see much of any variation in response times. > > > > > Of course, I can see why google would find this kind of thing pretty > > > > annoying, since it could undermine their ability to use their hardware > > > > efficiently! > > > > > -Joshua > > > > > On Sep 21, 2009, at 11:51 AM, pdub wrote: > > > > > > I have a Python-based application deployed on the App Engine. The > > > > > application framework (Django App Engine Patch) is a little bit > > > > > heavyweight, so it takes some time to start up and load all the > > > > > necessary modules, but once it's loaded it's quite fast. From my > > > > > logs, it looks like the application is having to start up fairly > > > > > frequently, which causes very inconsistent response times depending on > > > > > whether or not it's loading again. To my knowledge, this can be due > > > > > to two reasons: > > > > > > 1. The request is being handled by a new processing node on which the > > > > > application hasn't been loaded yet > > > > > 2. The application had been loaded on this node, but it has been so > > > > > long since the last request that it has been unloaded in the meantime > > > > > > To try to resolve point 2, I created a cron job on an external server > > > > > that "pings" the home page of my app every 10 seconds or so, and this > > > > > has helped somewhat. However, my logs show that the application still > > > > > has to start up on about half of these ping requests. > > > > > > To improve my process for keeping my application warm, it would help > > > > > if I understood: > > > > > > A. How are requests routed in appengine (round-robin, some stickiness, > > > > > etc.)? > > > > > B. How long can I typically expect my application to stay loaded in > > > > > memory? > > > > > > This would help me figure out whether my approach is even viable (i.e. > > > > > won't work for round-robin over large cluster) and what to set my ping > > > > > interval at. > > > > > > Does anyone have any documentation/insights into either of these > > > > > points and/or suggestions for alternate approaches to achieving more > > > > > consistent response times? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
