On Tue, Dec 2, 2008 at 3:35 AM, JM Ibanez <[EMAIL PROTECTED]> wrote: > > On Tue, Dec 2, 2008 at 4:20 PM, Amir Michail <[EMAIL PROTECTED]> wrote: >> >> On Tue, Dec 2, 2008 at 3:08 AM, Amir Michail <[EMAIL PROTECTED]> wrote: >>> On Tue, Dec 2, 2008 at 3:07 AM, Greg <[EMAIL PROTECTED]> wrote: >>>> >>>>> When doing a urlfetch, it may take quite a long time. As this is not >>>>> a CPU usage issue, what's the point of limiting the request time >>>>> anyway? Why not allow the request to go on for a minute or so? >>>> Because it ties up memory for the duration of the request. Imagine if >>>> they allowed hour long requests - it would be easy to swamp machines >>>> with requests waiting for a response. >> >> Or just handle it with some sort of memory quota. > > It's not just memory, it's also the fact that threads are also > waiting. And there are only a limited number of threads that can be > created and can be waiting at any time. > > If all of your threads are waiting, even for a single minute, then no > other requests can be served in the meantime. Then, at peak, more > requests will come in which will have to be queued. Ad infinitum: > you'll end up with HTTP requests which have to timeout because there > aren't any threads available to handle them.
What's so special about the current time limit in that respect? As for scalability, sometimes you need to do things in an undesirable manner when you don't have much data yet (e.g., heavy reliance on getting data via an API). But as you get more users and more data, then you could do things differently. Amir > > > -- > JM Ibanez -- > > The worst government is often the most moral. One composed of cynics > is often very tolerant and humane. But when fanatics are on top there > is no limit to oppression. > -- H. L. Mencken > > ----- > http://www.livejournal.com/~jmibanez/ > httitp://www.mycgiserver.com/~butiki/ > > > > -- http://b4utweet.com http://chatbotgame.com http://numbrosia.com http://twitter.com/amichail --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
