Okay I updated the recipe to use memcache and cron to synchronize tasks and ensure exactly 1 task is ever active
http://appengine-cookbook.appspot.com/recipe/hot-handler Robin On Nov 12, 4:26 pm, Robin B <robi...@gmail.com> wrote: > > Robin, do you have any idea how we can make sure, that a new keep- > > alive task only gets insertet, if the queue is empty? Unfortunately > > there seems to be no method to query a task queue. > > I do not think you can read the queue length. > > Tasks will not be removed unless they receive a 200 http status code. > Visting /_ah/queue/default as admin would insert another set of tasks > which would be bad. > > I suspect that there were 9 non-200 HTTP responses (errors) that > caused the duplicate tasks. Fixing this problem would require > synchronization using memcache and getting/setting a known key. If a > task detects that the value is not what it expected, then it does not > write the key or insert the next task, because another task is running > and already inserted its next task... > > To stop the tasks quickly, you can comment out the line that inserts > the next task, and re-depoly so the current tasks will finish and not > insert new ones. > > Robin > > On Nov 11, 7:28 am, Markus Gritsch <m.grit...@gmail.com> wrote: > > > Hi, > > > this is quite nice and it worked for me for some time now. The app > > loads fast, even if no one was visiting the site for hours. Until > > recently: > > > When I was visiting the appengine dashboard today, there were 9 keep- > > alive tasks in the queue which raised the average request rate > > considerably and ate up my quota :) I think this can happen because, > > according to the task queue specs, it may happen that a task gets > > executet multiple times, not just once. > > > Robin, do you have any idea how we can make sure, that a new keep- > > alive task only gets insertet, if the queue is empty? Unfortunately > > there seems to be no method to query a task queue. > > > Kind regards, > > Markus --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to web2py@googlegroups.com To unsubscribe from this group, send email to web2py+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/web2py?hl=en -~----------~----~----~----~------~----~------~--~---
