Hi Alexandru, It's just a guess, but one possibility is that one of your task keeps adding another task and then fails, and as a result, you have lots of similar tasks in your queue. Here are few suggestions to prevent it from happening.
* Use named task for preventing task bomb https://developers.google.com/appengine/docs/java/taskqueue/overview#Task_Names If you try to add a task with the same name as one of the recent tasks, it'll throw an error. You can just catch that error and ignore it in most cases. * Set appropriate retry count for that queue https://developers.google.com/appengine/docs/java/config/queue#Configuring_Retry_Attempts_for_Failed_Tasks Hope it helps! -- Takashi On Thu, Jun 21, 2012 at 5:33 AM, Alexandru Farcaş <[email protected]> wrote: > We had a short period (~40 minutes) when the number of instances increased > from 2-3 to ~30 which caused a very hugh increasion of frontend instance > hour cost. There was also a problem with the datastore read operations (10 > times higher for this period) > > I think that this happened because a task was multiplied >2000 times. This > happened to me a long time ago (2, 3 times) when in a few seconds a single > task multiplied more than 2000 times and make the same operation (in my case > the read operation). I can't find anything from logs because the space is > full with com.google.apphosting.api.ApiProxy$OverQuotaException because I > had a budget limit on my app (which was reached). > > > Another unusal thing is that my app has 8 idle instances (normally it has > 1-2) > > My app id: ebashr > (HR, AppEngine Java 1.6.3 sdk) > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-appengine/-/rRDLKn95_tAJ. > 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. -- Takashi Matsuo | Developer Advocate | [email protected] -- 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.
